8-24 baader zoom and focal reducer?
Posted 29 January 2013 - 11:36 PM
So are most of you typically using the zoom as is and then using a wide angle lens when needed, or do you normally use the zoom with a 0.63 focal reducer to get to lower magnifications (and I still assume a wider eyepiece for wide angle views)?
I'm trying to understand what accessories I'll need when I get it because I'd like to propose a bundle deal with some of vendors and get all the add ons up front like the JMI, 2" diagonal and dew shield.
With my f4.9 12" dob (1500 mm focal length), my preferred viewing range was at the 8-16 mm position (95X-190X magnification based on 1500/8 & 1500/16), so my option without the focal reducer to get similar magnifications is the 10-21 mm range (2032/95 & 2032/190) and with the focal reducer I'm back to the 8-14 mm range (2032*0.63/95 & 2032*0.63/190).
It seems not to make sense to get a focal reducer since I don't like that extra piece of glass, but I really want to sense check my thoughts. It should then only effect which wide angle lens I buy, which will just be one since I don't think I'll use it that often.
Thanks in advance for the advice (and all the advice that has come before this post).
Posted 30 January 2013 - 06:37 AM
I use the Baader 8-24 zoom as my main eyepiece. I use it "as is" and find it excellent for general observing as well as close in observing of planets globular clusters, D.S.Os and the like.
For wide angle views I use a 26mm, 30mm and 38mm all with 70 deg AFOV. They are all 2" eyepieces.
I do have a second 8-24 zoom (A.S) and have my 0.6 focal reducer more or less permanently attached to it. It gives a wider FOV when just trolling around.
Posted 30 January 2013 - 07:33 AM
There really is no right answer here. Some people use a focal reducer all the time, including with a zoom, others hardly ever.
My personal issue with the focal reducer is that it takes too much fiddling to put it on and off. There's a lot of threads and they're fine threads so it takes a lot of turning. I find it MUCH easier to just swap an eyepiece. So for me, the Baader zoom along with a wide angle eyepiece is a more convenient combination.
Posted 31 January 2013 - 12:08 AM
Posted 31 January 2013 - 05:14 AM
All three of my W.A eyepieces are GSOs. All, as I said above are 70deg. I use the 26mm as my Goto eyepiece and for general wide field viewing.
Among my favourite targets are open clusters, and I find the 30mm and the 38mm ideal for observing them, as we'll as rich star fields and the like.I can see a fair slice of the double cluster (NGC884/869) through the 38mm.
I find they all work very well with the 8se
I find the zoom ideal for teasing out detail on globulars clusters, planets, nebula, DSOs and splitting double stars.
Hope this helps.
Posted 31 January 2013 - 07:05 AM
but from what you said, I could use my 28 mm SWA meade similar to your 26 mm and then get one wide field lens (34-38mm)
Posted 31 January 2013 - 09:26 AM
Posted 31 January 2013 - 09:32 AM
I should have said "My main" Goto eyepiece when refering to the 26mm.
The 26mm gives the scope a better chance of landing on the target, and the wider view it provides is more pleasing on the eye.
I often do leave the zoom in place at 24mm when going to fainter, low mag targets.
I think what you suggest for yourself above should work fine with an 8se.
Just a thought Aaron, before I went to using 2" eyepieces, I used the stock 25mm that comes with the 8se as my Goto eyepiece. It performed very well as such.
If and when you get your 8se, (good luck) you need to know that we demand a First Light report from you.
Posted 31 January 2013 - 09:09 PM
Posted 01 February 2013 - 02:28 AM
Posted 01 February 2013 - 07:28 AM
But ... I didn't send the zoom back. I like it for grab and go use. When I take a small scope out for a quick view, I grab the zoom and one other EP and it's like a whole case of EPs. Very handy.
Posted 01 February 2013 - 07:12 PM
Daytime indoor eyepiece testing with the Nexstar 8SE + f/6.3 FF/FR
All eyepieces tested in the Nexstar 8SE with f/6.3 FF/FR. Testing was done indoors, during the daytime, focusing on branches on tree towards the southern horizon about 200 yards away.
Baader Hyperion Zoom:
24mm - The only configuration where vignetting was detected and it was in abundance. On axis image very sharp, however and only outer 15% before vignetting is blurred. ER is just enough to get in there and see the entire (small) FOV.
20mm - ER way too tight, needed to take glasses off. Razor-sharp field stop and crisp on-axis views; a surprisingly great view! Outer 10% blurry only.
16mm - Nice, crisp view with a razor-sharp field stop. The FOV looks a lot bigger than what I previously thought for the zoom at this focal length. It looks more like 65* and I switched back and forth between this and the LVW 22 and they looked like they had identical AFOV's. Probably more like 60-62* AFOV since the 12mm setting is bigger and that was on par with the Expanse. I wish I could have this view with my glasses on but that was not possible unless I pushed my glasses into my eye or really pushed up on the eyepiece, causing the image to move around.
12mm - I could almost get close enough to use this wearing my glasses but was constantly bumping the EP. I would estimate the ER at this setting to be ~16-17mm +/- 1mm. The view is plenty sharp out to about 80-85% before the edge and the AFOV seems equivalent to the Expanse 6mm (66*). The field stop is very slightly blurry at this focal length, however.
10mm - Compared this directly to the Baader Hyperion 10mm and the AFOV in the standalone focal length was larger by a hair. View was sharp. ER was helped but still tight.
8mm - This slightly larger AFOV probably hits the advertised 68* max AFOV for the zoom. ER is helped even more to the point where I can view with glasses and if I am careful I will only slightly bump the EP here and there. Field stop is a little blurry but the vast majority of the field is (95%) is sharp and usable, if not all.