QUOTE(deepyu @ Oct 14 2005, 10:51 AM)
Nice to have u here Choostar..
Mr.LKM....we definitely need the equatorial to do astrophoto
and altaz mount alone cant do the job..
and telephoto is needed or not depends on your astrophoto field..
if you want to take galaxies, wide angle astrophoto then no need telescope..
as i told here before..normal lens, 200mm-400mm telephoto lens can do this job.
But a 200mm lens with f2.8 will cost u as expensive as telescope.
and i think this telephoto lens actually do better job than normal telescope.
But if you think to shoot mars, moon etc than a telescope with longer focal length
is needed.because u will need 700mm above focal length(as long as u can afford)
to take nice mars pics and no telephoto lens can cover this focal length.(except some
order made telephoto lens that will cost u a double storey house in klang valley area)

correct me if I'm wrong Choostar

Thank you, deepyu.
I'm pretty agreed with deepyu in the aspect of PHOTOGRAPHY in astronomy. A fast focal ratio and medium telephoto lens is indeed an excellent companion in celestial shooting. As the weather concern, we somehow need to race with time, therefore, it's hardly for us to do many long exposures within a night. When you try to get a good telescope with large aperture, it's good to have its light gathering power. When comes to the exposure wise, we'll need to apply an extra lens called focal reducer to fasten the f in order to shorten the exposure. A 200mm f/2.8 lens (easily over 2k) is very portable and convenient for photographer but not for observing. So, when one highlights on visual observation, a telescope is no doubt more practical. However, a telescope (no matter of its optical system) is applicable to astrophoto, if mounted with a motorized system.
There are some telescopes are specifically builted for astrophoto, 150mm (aperture) with f/2.4.... WOW! Again, we'll sweat over the price..
You'll see it's a different perspective so not necessary to have arguement.
For a beginner, I should say that starting with the existing instrument is a wise option. The basic knowledge of astronomy (ie. celestial motion) is the must.
As for GOTO telescope, it's good either. But I don't see it's an absolute or excellent equipment in astrophoto. What I try to highlight is the technique of tracking does depend on the observer/user not the telescope or GOTO system itself. It does a good job when you key in the object number and let it slews to the designated objects. We understand that most of us enjoy the convenience of automated gadget (and sometime I also prefer to get one to search for Sombrero galaxy) rather than sweating by our hard effort - but it's worthy, you will be satisfied!
In APGM, we try to make the awareness that your existing photographic equipment might surprice you by few steps to snap celestial... in case of your fully understanding of own setup.
Nice to meeting and chatting with you guys here. Have a nice day.