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Powermates for deepsky?
Posted 07 May 2012 - 12:57 AM
My next target will be the whirlpool galaxy, autoguiding etc etc. I know its going to image alot smaller even at 18mp. The occular plugin on stellarium seems to be spot on in regards to what to expect.
If i wanted to achieve some extra magnification could i use a powermate/dslr with success on deepsky objects? and at what power would i have to draw a line? I'm currently using a st150 refractor. Is the only issue a longer exposure time? or would there be serious image degradation at the extra magnifications? Ill be upgrading scope sooner or later so the powermate with be handy whatever i do.
So to conclude, i am just wondering if its worth buying one, and what power to buy. I'm only interested in imaging deepsky.
Posted 07 May 2012 - 07:21 AM
If you look at my post there's some input about calculating additional time and dawes limit.
Edited by NickK, 07 May 2012 - 07:25 AM.
Posted 07 May 2012 - 12:54 PM
Skywatcher HEQ5, ED80 DS PRO, ST80
Canon 7D DSLR, 1000d modded
Lots of big warm jumpers & thermals
Posted 07 May 2012 - 05:13 PM
I think ill just try and see, using max 2x TY.
After more reading...
I have a 550d so my sensor diagonal measurement is 28mm. Scope focal length is 750mm
750 / 28mm = 27x magnification prime focus? Maximum useful magnification in perfect circumstances is 300x So i have plenty of headroom? longer exposure and coma are my main problems?
This optical stuff baffles me, the maths is easy, its just not intuitive lol.
Edited by danielbb, 07 May 2012 - 05:36 PM.
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