Image of the day

From the
ATWB Customer Gallery

IC410

My Account

New to Astromart?

Register an account...

Need Help?

mount tracking accuracy

Started by psbenoit2007, 10/01/2013 05:57PM
Posted 10/01/2013 05:57PM | Edited 10/01/2013 05:58PM Opening Post
Hello all,
I want to get myself into astrophotography. Before spending a fortune on equipment, I want to confirm this new hobby using my existing photo equipment (my longest lens is 600 4, which I can push to 1200mm) and am planning to buy a second hand Canon 60d I could have modified to let the H alpha through.
Now comes the question of the mount. Provided the fairly short focal lengths I am planning on using (for now), I was wondering about the type of mount I should consider acquiring for clean pinpoint stars on up to 15min PEC corrected and-or guided mount shot exposures. I can see a group of mounts (EQ6, CGEM DX, iEQ45, G11, Vixen SXD) in the 1500-2500$ price range that I would be happy to invest in if they are providing good enough tracking accuracy. Now should I consider going one step up and look at more accurate models such as an EQ8, AP Mac1GTO, 10Micron 1000HGS, Bisque Paramount MX, ASA DMM60 or the like, but then we are really not talking about the same budget.
Advise from forum experts much appreciated. Thank you. Paul.
Posted 10/09/2013 04:30PM #1
Paul Benoit said:

Hello all,
I want to get myself into astrophotography. Before spending a fortune on equipment, I want to confirm this new hobby using my existing photo equipment (my longest lens is 600 4, which I can push to 1200mm) and am planning to buy a second hand Canon 60d I could have modified to let the H alpha through.
Now comes the question of the mount. Provided the fairly short focal lengths I am planning on using (for now), I was wondering about the type of mount I should consider acquiring for clean pinpoint stars on up to 15min PEC corrected and-or guided mount shot exposures. I can see a group of mounts (EQ6, CGEM DX, iEQ45, G11, Vixen SXD) in the 1500-2500$ price range that I would be happy to invest in if they are providing good enough tracking accuracy. Now should I consider going one step up and look at more accurate models such as an EQ8, AP Mac1GTO, 10Micron 1000HGS, Bisque Paramount MX, ASA DMM60 or the like, but then we are really not talking about the same budget.
Advise from forum experts much appreciated. Thank you. Paul.

The long and the short of it? At 600mm, any of these mounts will give you a minute or so with a good proportion of acceptable frames. Want more than that? You will need to guide. If you guide, any of these mounts will do what you want. One suggestion? You will find that at these focal lengths a small telescope like an ED refractor designed for astronomy will yield better results and will be easier to frame. Also, if you plan on sticking with a DSLR and a long lens, you might look at iOptrons Ieq25 mount.

Finally, get started simply with a normal lens before you start upping the focal length. At 1200mm, especially, things get HARDER. wink

Uncle Rod

Time on your hands?
Waste it with Uncle Rod's Astro Blog!

http://uncle-rods.blogspot.com/
Posted 12/07/2013 03:22AM #2
Realistically at that focal length with a Paramount MX, PEC programmed, a good Tpoint model and ProTrack enabled you can easily go five minutes unguided with pinpoint stars. Okay, some people can achieve ten minutes, but that's really pushing your luck. Beyond that requires autoguiding (preferably with an off-axis guider if/when you get up into longer focal lengths). The convenience of not having to use an autoguider is considerable.