Quote:
Originally Posted by callingrohit
Hi daniel,thanks for the reply. The deluxe version is $100 dearer than the limited version and the only difference between the two is Crayford style focuser. The Guan Sheng CRAYFORD style 2" 10:1 micro-focusers - Newtonian reflector type (230mm) is for $99 (on Andrews site) and hence the $100 increase in the deluxe version. In regards to the mount, well that would be surely in future because i searched in other posts and everybody recommended the one you suggest - EQ5/6 which are for approx $ 2000 and i'm 110% sure I can't include in my budget unless the last zero drops out...  But I was just wondering in regards to astrophotography, that if I use a CCD webcam like the ToUcam or the Neximage (the 8" dob at andrews comes with a 2" to 1.25" adaptor) or even my Canon EOS 400D with the appropriate adapters, can't i still photograph the planets or constellations. i'm not sure if DSO's will be possible as no tracking exists on the 8" dob.thanksVivek |
Having gone through this a few months ago....
Firstly, when you buy the dob it will be for visual observing, not imaging, the dob mount is not easily driven (I'll ignore equatorial platforms for the moment) and the only photography you can really do is shots of the moon. Everything you view through the dob will drift across the eye and so only short exposures work and thus only the moon can realistically be photographed.
Secondly, I've experimented a fair bit with my 350D and the problem with the dobs is that you don't have enough travel in the focuser to get the camera to focus. The only way you can do it without modifying the scope is to use a barlow lens, which also increases the magnification meaning you can't get the entire moon onto the frame of the camera.
Thirdly, the 10:1 Crayford focuser is well worth the extra. I think you also get a right angle finder rather than straight through with the deluxe model and that is also a great help with a dob. There may be a difference in eyepieces too?
Fourthly, we all start off wanting to do photography, but it is hard and it is expensive. At the moment I have found myself very happy with visual observing only. The optical tube is the major cost of the dob and that can be mounted as you've seen, on a driven equatorial mount in the future so you are losing nothing by getting the dob for now.