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Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes

4.7 (22 Reviews) Read Reviews Write Review
Brand Antares
Part Number SCTFR
Availability available

Product Info

Manufacturer Description

Antares' f/6.3 focal reducer provides a faster f/6.3 system for imaging or visual use when used with an f/10 SCT or other compatible telescopes. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. The female end attaches to the rear cell of the telescope. All additional accessories mount onto the exterior/male threads. The reducer features fully coated optics in an anodized aluminum filter ring with an ergonomic rubber grip. It features a standard male SCT thread (2" OD, 24 TPI) on one side and a standard SCT female thread on the other.

This is one of our best-selling items, and customers have reported that this product is at least as good as, and probably better than, other leading f/6.3 focal reducers sold on the market for a lot more. However, even though the imprint on the item states "Reducer / Corrector" please note that his is a reducer only. It is not a corrector or flattener.

Specifications:

  • Focal length = 220mm
  • Clear aperture = 40.8mm (1.60") 
  • Length of male SCT thread = 5mm (0.2") but this is preceded by an unthreaded part on the eyepiece side making the total length = 8.8mm (0.35") 
  • Length of female SCT thread = 7.5mm (0.3") 
  • Weight = 4.3oz.
  • Made in Canada

Please note:

  • A couple of tiny dust particles between lens elements, uneven lens edge blackening, very minor coating blemishes, or even a very small fine lens scratch or two are very common in this Antares product and must be accepted as normal for this item. However, these will not impact optical performance.
  • A few people have reported issues with the male SCT thread diameter on this item being a bit larger than necessary. We have tested our current batch and it works with Meade, Celestron, and Baader SCT accessories. However, it will not thread into William Optics accessories, and with GSO it is a hit or miss. Hence, there is a chance that you may not be able to thread your SCT diagonal or other SCT accessory on to this reducer for these or for any other brand. In such cases, we will be happy to take the item back as per our standard return terms.

Reviews

4.7 (Based on 22 Reviews) 95% of reviewers recommended this product.
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    1. Guest

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      Review by marco of France.
      1454630400
      Feb 4, 2016

      4.0 Perfect and cheaper

      Pros:

      Easy to Use,Lightweight,Strong Construction,Compact,Quality Lenses,Accurate

      Cons:

      Comments:

      Very good product same quality and cheaper. Constraint of relatively short back focus.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      Review by TrevDownUnder of Sydney, Australia.
      1386374400
      Dec 6, 2013

      5.0 Worth every cent!

      Pros:

      Quality Lenses,Easy to Use,Strong Construction,Compact

      Cons:

      Comments:

      Works well with my Meade LX90 ACF and Orion Starshoot G3.
      Brighter images and shorter exposures than native f/10 with minimal distortion.
      Good too for visual use on weaker nebulosities and those objects which would not fit in the eyepiece without it.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by Cystokid of Boyne City MI.
      1385769600
      Nov 29, 2013

      5.0 Works great!

      Pros:

      Quality Lenses,Accurate,Strong Construction

      Cons:

      Comments:

      Fit and finish we're perfect. No problem with focusing, and my images are clear and crisp. Recommended highly!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by FJS440 of Avon, OH.
      1369958400
      May 30, 2013

      4.0 It does what it is supposed to do.

      Pros:

      Quality Lenses,Easy to Use,Accurate,Lightweight

      Cons:

      Comments:

      This focal reducer is easy to use and works like it should on my 8" SCT. Great buy for the money.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    5. Guest

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      Review by BobT of Driftwood, TX.
      1355011200
      Dec 8, 2012

      5.0 Nice product at a good price

      Pros:

      Strong Construction,Quality Lenses,Lightweight,Easy to Use

      Cons:

      Comments:

      I use this focal reducer with my 8" SCT. I have nothing to compare it with as it is the only focal reducer I have tried. The machining is of high quality. I had no trouble reaching focus and it definitely reduces exposure time.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    6. Guest

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      Review by Alex of Victorville, CA.
      1354320000
      Nov 30, 2012

      4.0 Nice accessory

      Pros:

      Quality Lenses,Strong Construction,Compact,Easy to Use

      Cons:

      Only One Lens Cap

      Comments:

      I'm very satisfied with the reducer/corrector. Makes my C8 f/10 into an f/6 and sharpens up stars on the edge of field (not as good as my Russian Mak, but pretty good). Gives me a 1.3 deg FOV with my 24mm Panoptic. I haven't had a chance to test if it degrades planetary images any but I find no degradation in nebulae or star diffraction disk. I do have two complaints though. First, one of the outward facing lenses had a film on it. I was able to clean it, but was not happy I had to do so. Second, the reducer only comes with one lens cap two would be nice for storage.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    7. Guest

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      Review by Elvs 52 of Bolivar, Ohio.
      1337731200
      May 22, 2012

      5.0 Great product

      Pros:

      Strong Construction,Quality Lenses,Lightweight,Easy to Use

      Cons:

      Difficult To Focus

      Comments:

      When I want to increase my F10 FOV, I attach this 6.3 reducer and I see more area (Arc sec) than without it. It acts more like a Fast Newtonian Reflector. Also,Dust caps would be nice to have included with this product.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    8. Guest

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      Review by castle of Turkey.
      1325635200
      Jan 3, 2012

      4.0 Good performance at low price

      Pros:

      Quality Lenses,Strong Construction,Accurate

      Cons:

      Comments:

      It is the cheapest focal reducer in its class and works well for visual observation and astrophotography.

      Bottom Line: Would you recommend this item? No
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    9. Guest

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      Review by AhBok of Tennessee.
      1320451200
      Nov 4, 2011

      5.0 Great value!

      Pros:

      Quality Lenses,Strong Construction,Accurate

      Cons:

      Comments:

      The reason this is the best value in a .63 reducer corrector is because it is the same exact quality as the others. This looks the same and works the same. I couldn't be more pleased. Only one end cap, otherwise, a great deal.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    10. Guest

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      Review by b_eftimov of Varna, Bulgaria.
      1319932800
      Oct 29, 2011

      5.0 Totally satisfied

      Pros:

      Easy to Use,Accurate,Quality Lenses

      Cons:

      Comments:

      The cheapest price in the world for such a hi-tech lens. I am totally satisfied with the product. Thanks Agena!

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    11. Guest

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      Review by AO of Coslada (Madrid) Spain.
      1319846400
      Oct 28, 2011

      5.0 Good results at low prices

      Pros:

      Quality Lenses

      Cons:

      Comments:

      This focal reducer works perfectly in SCT, is also testing my orion Maksutov 180/2700 Dante a really good result. The focus quality is really good, reducing the focus of the telescope, giving a very good result in satisfactory visual and astrophotography.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    12. Guest

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      Review by Jackpomme of Beauce, Canada.
      1306627200
      May 28, 2011

      5.0 An excellent product

      Pros:

      Strong Construction

      Cons:

      Comments:

      I use this product with my telescope and I observe the galaxies and nebulae

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    13. Steve

      Steve New Member

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      Review by Steve of Pennsburg, PA.
      1284076800
      Sep 9, 2010

      5.0 Great addition to my CAT

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Comments:

      I bought this a while ago but the skies have been unkind. I finally got to use it the past 2 weekends.
      Installed easily, no threading problems at all. Effectively doubles the amount of eyepieces I own. It also reduces the edge curvature of my C8 and widens the field as much as a SCT can get. Mainly used for dark fuzzies. It is not needed for planets for visual use but perfect for open clusters and other DSOs

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    14. socialoutkast

      socialoutkast New Member

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      1281271680
      Aug 8, 2010

      5.0 Sharpens the CATs claws

      Pros:

      Well constructed. Flattens the edge. No apparent loss of light. Easy to thread on

      Cons:

      None

      Comments:

      I bought this focal reducer a while ago. Been cloudy since. I finally got to test it out Friday night. First locked onto M13 without the focal reducer. I could resolve about a dozen stars. Then I put on the focal reducer. Threaded easily. Reacquired M13 and found the same number of stars. The field flattened out nicely. Next, I did the same thing with Jupiter and its moons. The outer moons seemed a little sharper with the focal reducer in place. No loss of Io's shadow transiting the planet. I believe I will keep the focal reducer on permanently.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No
    15. Guest

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      Review by Chris of Malta.
      1243814400
      May 31, 2009

      5.0 Excellent reducer even better value

      Pros:

      Strong Construction,Quality Lenses

      Cons:

      Comments:

      Very good focal reducer worked great with my C8 Cat also serves as a good dust seal. Superior optics, no visible distortion, easy to focus and capable of increasing exposure time by at least 50%. Highly recommended.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    16. Guest

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      Review by JA of FT LAUDERDALE FLORIDA.
      1243382400
      May 26, 2009

      4.0 GOOD PRODUCT FOR THE MONEY

      Pros:

      Quality Lenses

      Cons:

      Difficult to Use

      Comments:

      PROS: 1. WORKS FINE
      2. COSTS LESS THAN THE CELESTRON ITEM

      CONS: 1. THREADS ARE REALLY TIGHT. CHANCE OF CROSS-THREADING IF THEY ARE NOT LUBRICATED AND INSTALLED ON THE SCOPE WITH CARE.
      2. ONLY ONE CAP INCLUDED. WOULD BE BETTER WITH TWO CAPS TO PROTECT THE OPTICS.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    17. Guest

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      Review by Sp... of Tullymorgan NSW Australia.
      1243382400
      May 26, 2009

      5.0 Antares f 6.3 reducer...

      Pros:

      Accurate,Strong Construction,Quality Lenses,Compact

      Cons:

      Comments:

      I haven`t had the opportunity to compare the Antares with a similar model but did have a 0.6 reducer attachable directly to the camera until recently (lost when moving the gear). The Antares seems as good & is doubly useful as it can be used for reducing both imaging & guiding CCDs simultaneously.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    18. AstroGuy1

      AstroGuy1 New Member

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      Review by Nicolai Vallone of Italy.
      1231977600
      Jan 14, 2009

      5.0 Excellent reducer for SCT

      Pros:

      Sharp for visual use,Works great for imaging,Price very good

      Cons:

      Doesn't work w binoviewer

      Comments:

      I bought this item from agenaastro.com, and I tried it on my Meade LX90. It works great (with my W.O. 20mm Superwide).

      No problem for focus. Very sharp views! Price is very good. I expect to use it with my Celestron C9.25. Work good too with my EOS350D (direct focus config.).

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    19. AstroGuy1

      AstroGuy1 New Member

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      Review by tjhayko of Canada.
      1228176000
      Dec 1, 2008

      5.0 Excellent addition to any SCT

      Pros:

      Seals end of tube,Inexpensive,Flatter field

      Cons:

      None

      Comments:

      I picked this up a while back, and finally got around to using it earlier this week. I was surprised at what a difference it made with all my eyepieces! I originally intended to use it with just my longest focal length eyepieces to get a bit more field of view and to try to shorten some exposures as I work my way up the astrophotography learning curve, but every eyepiece seemed to perform just a little bit better with it in place. Star images seemed sharper, and the stars at the edge of the field of view seemed significantly cleaner than they are without it.

      I'm considering just leaving it on my scope all the time, as it acts a seal as well.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    20. Guest

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      Review by mhuston6 of Florida.
      1226880000
      Nov 16, 2008

      4.0 Antares f/6.3 Focal Reducer

      Pros:

      Flat design is great,Nice color correction,A must for any f10 user

      Cons:

      Comments:

      I got a great deal on a new Antares f/6.3 focal reducer. Plus I needed this reducer because of my C8 f/10's long focal length. Without this lens, it was very hard to view most star clusters and wide nebulae. But there is a problem with this reducer. It's not because of the brand or reduction it provides, but when using very low power eyepieces like a 1.25" 40mm and a 1.25" 32mm, the edge of the view looks like a swirled mess of blurry stars. I would say 1/2 of the view is not usable because of this problem!

      On the other hand, when using a 1.25" 20mm and lower focal length, it works very well. I cannot explain this because I have no idea why this reducer does that to the long focal lengths. Also when using a 2" 30mm GSO 68-degree eyepiece, the same problem is apparent. Other than the problems with long focal length eyepieces, it is a very good, high quality reducer with very good color correction. Image flatness is also better with the type of mirrors in my SCT. I have not tried using this with my CCD imager yet but since the imager size is about the same as a 6mm eyepiece, I'm sure it will perform very well. For visual use, I usually just leave the reducer on the rear cell and use it for scanning for goodies - with the 20mm and lower focal lengths, of course :-)

      Overall, I think I have made a great choice buying the Antares f/6.3, but if you are going to buy one, I would recommend this to any SCT user. You might not have the same problems I do with your eyepieces.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    21. tjhayko

      tjhayko New Member

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      1222440660
      Sep 26, 2008

      5.0 Excellent addition to any SCT

      Pros:

      Inexpensive, flatter field, seals end of tube

      Cons:

      None

      Comments:

      I picked this up a while back, and finally got around to using it earlier this week. I was surprised at what a difference it made with all my eyepieces! I originally intended to use it with just my longest focal length eyepieces to get a bit more field of view and to try to shorten some exposures as I work my way up the astrophotography learning curve, but every eyepiece seemed to perform just a little bit better with it in place. Star images seemed sharper, and the stars at the edge of the field of view seemed significantly cleaner than they are without it.

      I'm considering just leaving it on my scope all the time, as it acts a seal as well.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No
    22. mhuston6

      mhuston6 New Member

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      1186815360
      Aug 10, 2007

      4.0 Antares SCT f/6.3 Focal Reducer

      Pros:

      Nice color correction, flat design is great. Perfect price. A must for any f/10 user.

      Cons:

      Seems to have a limit on long focal eyepieces using either 1.25" or 2" eyepieces.

      Comments:

      I got a great deal on my new Antares f/6.3 focal reducer - at $65 shipped it was too hard to pass up a deal like that :-). Plus I needed this reducer because of my C8 f/10's long focal length. Without this lens, it was very hard to view most star clusters and wide nebulae. But there is a problem with this reducer. It's not because of the brand or reduction it provides, but when using very low power eyepieces like a 1.25" 40mm and a 1.25" 32mm, the edge of the view looks like a swirled mess of blurry stars. I would say 1/2 of the view is not usable because of this problem!

      On the other hand, when using a 1.25" 20mm and lower focal length, it works very well. I cannot explain this because I have no idea why this reducer does that to the long focal lengths. Also when using a 2" 30mm GSO 68-degree eyepiece, the same problem is apparent. Other than the problems with long focal length eyepieces, it is a very good, high quality reducer with very good color correction. Image flatness is also better with the type of mirrors in my SCT. I have not tried using this with my CCD imager yet but since the imager size is about the same as a 6mm eyepiece, I'm sure it will perform very well. For visual use, I usually just leave the reducer on the rear cell and use it for scanning for goodies - with the 20mm and lower focal lengths, of course :-)

      Overall, I think I have made a great choice buying the Antares f/6.3 for many reasons which might not be available to everyone (like the price), but if you are going to buy one, I would recommend this to any SCT user. You might not have the same problems I do with your eyepieces. I have seen these FR/C lens range from $65-$99 and even if you have to buy yours at $99, it's worth it.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No
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