?? Baader Planetarium 2.25x Q-Barlow ??
Posted 09 February 2013 - 10:34 AM
Posted 09 February 2013 - 08:49 PM
Posted 09 February 2013 - 09:17 PM
Posted 09 February 2013 - 09:22 PM
Posted 10 February 2013 - 02:11 PM
.....Despite it being marketed for the turret, it is a general-purpose barlow, yes?
Yes, I've used it with a number of other brand eyepieces and it works well.
I believe the link with the Q-Turret is that the optical element of the barlow is designed to be removed from the barlow body and screwed into the Q-Turret barrel (the part that goes into the scope drawtube) to move the focal plane outward around 25mm which allows the Turret to be used with scopes with limited focuser travel. In this mode the optical element amplifies the magnification of a given eyepiece in the Turret by 1.3x.
Posted 10 February 2013 - 03:07 PM
Slightly OT, are you using the BCO's in your F/5.3 dob without a coma corrector? If so, how are they?
Posted 10 February 2013 - 06:28 PM
I own the barlow and turret and mainly use Brandons in the setup. I agree, the barlow is an outstanding performer.
Posted 10 February 2013 - 08:31 PM
...Slightly OT, are you using the BCO's in your F/5.3 dob without a coma corrector? If so, how are they?
Yes I am and I don't find a coma corrector necessary with this scope, even when I use my Nagler and Ethos eyepieces.
The BCO's work very well with the 12" F/5.3 - the 6mm BCO showed me Sirius B a couple of nights ago and was competing well with a Baader Genuine Ortho of the same focal length that evening. The one slight negative with the BCO's (even with slower scopes) is that the outer 10% of their field of view is not sharp and has some distortion. The useable, sharp, field of view is about the same as the Baader GO's in paractice.
Posted 10 February 2013 - 08:47 PM
Posted 15 February 2013 - 12:36 AM
Posted 15 February 2013 - 10:16 AM
I got the 10mm BCO today and did some informal daylight viewing comparisons in the XT6 to two Plossls (Orion 10mm, GSO 9mm) and a Meade 9mm HD-60. Transparency, clarity, contrast-wise it's no contest, the BCO is far superior. Barlowing them with a 1.25" GSO, they became much more alike, suggesting that the barlow's "signature" was dominant. Which made me wonder about the Q barlow... if it were more transparent than the GSO, that would be very interesting, indeed...
This might explain why there are the mixed reports on the GSO barlows. Frankly, I was not at all impressed with the 2" 2x GSO ED barlow that gets great reviews. But as you're seeing when you combine an outstanding quality eyepiece with a so-so barlow - the fact that the barlow is just so-so becomes quite apparent.
Posted 15 February 2013 - 10:31 AM
So, is the Q-Barlow the best value in 1.25" barlows with good transparency, then?
Posted 15 February 2013 - 06:21 PM
I was really surprised how close the quality of the views were, with the exception of the difference in magnification.
I believe the Q-Turret 2.25x barlow has excellent optics within it's rather plain exterior.
Posted 15 February 2013 - 07:03 PM
I use the Baader Hyperion zoom with the barlow lens module of the BS modular barlow http://www.pt-ducks...._1.6x_magnifier (it seems a GSO clone), for my daylight cr-birding. I thought of using the Q-Barlow lens module with the Baader zoom to achieve an equivalent to a Pentax XF zoom but with better ER and wider AFOV. The question is if the minimum increase would be only 1.3X? I know there is a barlow for the zoom but has too much magnification increase for what I want. I know that I would have to use a 1.25" tube to use the Q-barlow on the Hyperion...
Posted 28 February 2013 - 06:32 PM
Tested in a Vixen NLV40 and the resulting increase is about 2.1x...