This 1.25" 5x Antares high performance barlow # UB5STL features a fully-multicoated achromatic design. This short barlow will work in diagonals or reflectors, has internal darkening and edge-blackened lenses, and is parfocal with most eyepieces. It features a clear aperture of 18mm. Suitable for high contrast, high power applications in any telescope. Made in Canada.
<p>This new version of Antares' popular UB5S barlow features an integrated twist-lock adapter / clamping mechanism to securely center and hold your eyepiece. The inner compression ring is made of polypropylene and will not mar your eyepieces. Unscrewing the twist-lock ring exposes a standard male T-thread (M42x0.75) underneath which can be used to couple imaging devices with the barlow.
- Barrel size: 1.25" / 31.7mm
- Magnification factor: 5x
- Type: Achromatic
- Coatings: Fully multicoated
- Clear aperture = 0.71" / 18mm
- Weight: 5.2oz / 147g
- Total length: 3.24" / 82.4mm
- Length of lower chrome barrel: 1.48" / 37.6mm
- Length of upper black barrel: 1.77" / 44.8mm
- Filter threads: No
- End caps: Coming soon
- Country: Made in Canada
Note that the use of any optical element like barlows and focal reducers changes the focus point of your telescope, requiring additional in-focus or out-focus travel. The exact amount of focus travel required will depend on the optics and mechanics of your specific set-up (telescope, diagonal (if used), barlow, and eyepiece). Hence, be aware that you may not be able to reach focus with all eyepieces or in all configurations with a given barlow.
Please note: This is a very high magnification barlow. It is not for everyone or for common viewing conditions. Before buying, please make sure that you are using realistic magnifications with your telescope. A good rule of thumb is that under very good conditions and with a very good telescope, the maximum power you will be able to use is about 50x of magnification per inch of telescope aperture. With average telescopes and/or average conditions, you should be able to use 30x of magnification per inch of telescope aperture. So for example, if you have a 6" telescope, under typical conditions you will be limited to 6x30 = 180x of magnification, and 6x50 = 300x of magnification at best.
Boosting the magnification beyond this recommended maximum for your telescope aperture is not realistic. This is bound to result in image break-down, causing fuzzy images, focusing difficulties, increased color around objects (caused by other optical elements in the telescope which are magnified by the barlow) and general disappointment, but this is not a fault of the barlow.
Sep 21, 2012
Overpowered by good qualityPros:
Quality Lenses,Easy to UseCons: Comments:
This item was purchased on a whim just to see what it would do in conjunction with a solar scope. It works very well on those rare days with clear, stable skies.
This review was provided courtesy of AgenaAstro.comJul 28, 2009
This Barlow completes my telescope!Pros:
Twist lock,Quality Lenses,Strong Construction,Compact,AccurateCons: Comments:
I want to give this 5 stars for quality, value, construction and the twist lock. However, at first I had trouble focusing with my 24-8mm zoom lens in this barlow because my scope focuser ran out of range. The twist lock saved me by allowing me to firmly lock the zoom eyepiece 3/16th inches out of the Antares Barlow to bring in gloriously sharp jaw-dropping lunar views at 225X through my short focal length (500mm) compact Newtonian reflector (114mm primary). This was not a problem with my fixed eyepieces, only with the zoom. It may not have anything to do with the Barlow at all. I don't have any others to compare to it but I mention it anyway. Now I can push my scope to the limits and beyond. I love it! The optics are invisible and distortion free. I can't wait to see what Jupiter, Saturn and Mars look like at full magnification! If you have a longer focal length telescope (600mm or more) then this Barlow is beyond overkill, go for the 3X or 2X, whichever gets you to your scope's magnification limit. Get the version with the twist lock! Once you've had a twist lock, the little screws seem cheap and flimsy. A great product!
This review was provided courtesy of AgenaAstro.comSort by