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View the Latest Correctors, Focal Reducers & Flattener Reviews
Item
Submitted By
GSO 2" 0.5x Focal Reducer
Useful thing to have
This focal reducer works well on a CCD camera used with an f/17 11" refractor.
This focal reducer works well on a CCD camera used with an f/17 11" refractor.
Tele Vue DIOPTRX Astigmatism Corrector - 3.50 # DRX-0350
Dioptrx simply works
TeleVue Dioptrx continue to impress with their ease of use and stunning optical clarity. Superior to wearing eye glasses. Affix to appropriate long eye relief TeleVue eyepiece to acquire immediate full correction for your astigmatism in the dominant ...
TeleVue Dioptrx continue to impress with their ease of use and stunning optical clarity. Superior to wearing eye glasses. Affix to appropriate long eye relief TeleVue eyepiece to acquire immediate full correction for your astigmatism in the dominant ...
GSO 2" Photo-Visual Coma Corrector for Newtonian Telescopes
Zhumell Telescope
The outside 30% of my Zhumell Z8 showed coma (where the stars look like seagulls). This got rid of that! The Z8 is an f/5.9 telescope. The Z10 and Z12 are f/4.x which means they're unusable without a coma corrector. It's this or the parracorr. You ...
The outside 30% of my Zhumell Z8 showed coma (where the stars look like seagulls). This got rid of that! The Z8 is an f/5.9 telescope. The Z10 and Z12 are f/4.x which means they're unusable without a coma corrector. It's this or the parracorr. You ...
Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes
Perfect and cheaper
Very good product same quality and cheaper. Constraint of relatively short back focus.
Very good product same quality and cheaper. Constraint of relatively short back focus.
Antares 1.25" 0.5x Focal Reducer
Good reducer
This is a great focal reducer for astrophotography or visual applications. Lowers the magnification and gives a wider view.
This is a great focal reducer for astrophotography or visual applications. Lowers the magnification and gives a wider view.
Antares 2" 0.5x Focal Reducer
Excellent
Wonderful as for visual as photo far field objects observations
Wonderful as for visual as photo far field objects observations
GSO 2" 0.5x Focal Reducer
2" focal reducer
If you are looking to reduce the focal length of a 2" eyepiece this is what you are looking for. Threads directly on the bottom and does a great job of reducing magnification and increasing field of view.
If you are looking to reduce the focal length of a 2" eyepiece this is what you are looking for. Threads directly on the bottom and does a great job of reducing magnification and increasing field of view.
HoTech 2" SCA Field Flattener with T-Thread for f/5 - f/8 Refractor Telescope # FF582
Very backfocus sensitive
I have used this flattener, until now, to correct field curvature on two low focal refactors: a 330 mm F/5,5 FPL53 doublet and a 400 mm F/5 achromat. The announced backfocus (55 mm) is inadequate with them. The optimal values are 77 mm with the first...
I have used this flattener, until now, to correct field curvature on two low focal refactors: a 330 mm F/5,5 FPL53 doublet and a 400 mm F/5 achromat. The announced backfocus (55 mm) is inadequate with them. The optimal values are 77 mm with the first...
GSO 2" 0.5x Focal Reducer
Works much better than I expected for visual use 2 inch size
This works much better than I expected ....it works much better than much more expensive things I've tried ..... I was trying to get low-power eyepieces for my Intes Alter 6P.... it's an f/15 scope.... I bought a vixen LVW 42 mm which was a disaster....
This works much better than I expected ....it works much better than much more expensive things I've tried ..... I was trying to get low-power eyepieces for my Intes Alter 6P.... it's an f/15 scope.... I bought a vixen LVW 42 mm which was a disaster....
GSO 2" Photo-Visual Coma Corrector for Newtonian Telescopes
Great help for fast Dobs
Purchased from Agena and received it in 2 days. There's a great thread on one of the forums about setting these up - but in brief you can either buy the 19mm spacer sold by Agena or simply move your eyepiece out that amount to achieve focus. I bough...
Purchased from Agena and received it in 2 days. There's a great thread on one of the forums about setting these up - but in brief you can either buy the 19mm spacer sold by Agena or simply move your eyepiece out that amount to achieve focus. I bough...
GSO 1.25" 0.5x Focal Reducer
Essential for full solar disk with my ASI 120MC camera.
I use this for solar photography to get a full disk or half disk view on my sensor. In order to get to good focus you'll also probably need some spacer rings.
I use this for solar photography to get a full disk or half disk view on my sensor. In order to get to good focus you'll also probably need some spacer rings.
GSO 2" Photo-Visual Coma Corrector for Newtonian Telescopes
Excellent flexible design
Fantastic product!!! Several of my Newtonian scopes are tightly designed with a very low focus height. This allows a smaller secondary mirror and hence smaller obstruction, but can also make used of corrector lenses more challenging. That is where...
Fantastic product!!! Several of my Newtonian scopes are tightly designed with a very low focus height. This allows a smaller secondary mirror and hence smaller obstruction, but can also make used of corrector lenses more challenging. That is where...
HoTech 2" SCA Field Flattener with T-Thread for f/5 - f/8 Refractor Telescope # FF582
Great field flattener at a attractive price
This is a great field flattener. Perfect edge to edge sharpness.
This is a great field flattener. Perfect edge to edge sharpness.
Sep 25, 2015
Antares 1.25" 0.5x Focal Reducer
Great lens; gimpy threads
I have enjoyed this for visual in a variety of configurations. Works well with widefields (like 9mm Z100) in C90 and C6 in 0.5x mode. Works well on barrel of most any EP for minor reduction at most any F/ratio. I successfully use a pair of these w...
I have enjoyed this for visual in a variety of configurations. Works well with widefields (like 9mm Z100) in C90 and C6 in 0.5x mode. Works well on barrel of most any EP for minor reduction at most any F/ratio. I successfully use a pair of these w...
Aug 23, 2015
GSO 2" 0.5x Focal Reducer
Good low cost reducer lens
I can image the entire moon or sun (with solar filter) when I use this reducer in my 1000mm focal length telescope. I get about 60x magnification with my neximage 5. You will need to adjust the imager plane carefully to get the best focus. I adjusted...
I can image the entire moon or sun (with solar filter) when I use this reducer in my 1000mm focal length telescope. I get about 60x magnification with my neximage 5. You will need to adjust the imager plane carefully to get the best focus. I adjusted...
GSO 1.25" 0.5x Focal Reducer
Complements 2X nosepiece in binoviewer
I bought this 0.5X to partially restore field of view when using a 2X barlow nose piece in a binoviewer. I had to add about 2 inches of spacers between the two with the 2X closer to the objective, but I was able to get back to just above 1X (maybe 1...
I bought this 0.5X to partially restore field of view when using a 2X barlow nose piece in a binoviewer. I had to add about 2 inches of spacers between the two with the 2X closer to the objective, but I was able to get back to just above 1X (maybe 1...
Antares 1.25" 0.5x Focal Reducer
Loose Threads
As some other reviewers have noted, the threaded section is way undersized and will not engage a standard 1.25" thread. You need to put about 5 layers of Teflon tape on it to make it take hold. Once you do that, it works fine.
As some other reviewers have noted, the threaded section is way undersized and will not engage a standard 1.25" thread. You need to put about 5 layers of Teflon tape on it to make it take hold. Once you do that, it works fine.
Antares 2" 0.5x Focal Reducer
Reduce you focal length
Very useful for getting wider views with good optics.
Very useful for getting wider views with good optics.
GSO 1.25" 0.5x Focal Reducer
When it works, it works well
The GSO Focal reducer works really well on applications that it was designed for - due to its aperture, it works better on eyepieces with a field stop of no greater then around 23MM. It can also be limited by the internal baffling if you have a SCT o...
The GSO Focal reducer works really well on applications that it was designed for - due to its aperture, it works better on eyepieces with a field stop of no greater then around 23MM. It can also be limited by the internal baffling if you have a SCT o...
Jun 26, 2015
Antares 1.25" 0.5x Focal Reducer
Undersized external threads
The reducer I received had way-undersized external threads. It slipped right into my Orion Starshoot nosepiece without threading. I had to put about 4 layers of teflon tape over the threads so that the reducer would stay in. Other than that it seems ...
The reducer I received had way-undersized external threads. It slipped right into my Orion Starshoot nosepiece without threading. I had to put about 4 layers of teflon tape over the threads so that the reducer would stay in. Other than that it seems ...
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