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Thursday, August 4th, 2011
Well.......last night was a little more like it, but still puzzling.   Considering all the problems I have had with guiding, I decided to avoid skunkiture by starting with a simple star cluster....unguided.   That went okay, and there was M31 sitting nice and high, so why not?   This time I turned on the guiding and wonder of wonders, the guiding was right on the money for more than an hour.   Then a funny thing happened on the way to euphoria.  Suddenly for no apparent reason the graph dropped 1 1/2 pixels, and then proceeded to track along at that level for the remaining half hour.  Very strange.  Can't figure it out.  The Dec axis does something different every time out.  It has got to be something with balance and position.  See graphs:
 
I thought I had the setup balanced.....wrong.  21lbs on the balance bar is not enough to offset the weight of 2 scopes, a finder scope, and 2 cameras.....plus the cords. 
 
Oh yeh.....I forgot to recharge my camera batteries......had to borrow a battery from my ex-wife or it would have been a total bummer.
 
M39:
50 minutes unguided (25 x 2 minutes) @ ISO 800
 
M31:
82 minutes guided (41 x 2 minutes) @ ISO 800 
 
6" imaging Newtonian, Canon 350D, CG5 mount, ST80mm guide scope, Starshoot II color ccd guider
Captured in Nebulosity
aligned and stacked in Deep Sky Stacker
Processed in Photo Shop CS1
 
 


Image Gallery For This Session
Guiding 1 Guiding 2
M31 8 3 11  41 x 2 min  guided B M39 in process B
guiding 3
   

Guiding 1.jpg
Click picture above for larger version
If the picture seems too bright or too dark, try adjusting the brightness below.
Brightness:
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Comments:
On 08/08/11 at 11:51pm Barry wrote:
10" of aperture would sure shorten the exposure time needed. Unfortunately, my budget is such that I am lucky to have the 6". M31 is just an awesome sight....I never tire of it. Majestic comes to mind.


On 08/08/11 at 08:06am Larry wrote:
I have seen some shots taken with the new Orion 10" f3.6 astrograph scope that look very very good. Might keep an eye on that one too for a future upgrade. But you're doing great with the 6".

On 08/05/11 at 12:37pm Barry wrote:
Thanks. The 6" imaging reflector is from Orion. The secondary mirror is recessed deeper into the tube, it came with a 2 speed low profile focuser. It's an f/5 750mm focal length. If I had it to do all over again, I would probably buy the 8" f4. 750mm FL is a bit long for large objects like M31.

On 08/04/11 at 06:47pm Larry wrote:
Love your shot of M31 with the 6" reflector. Beats up my telephoto lens shot a bit! I'll have to try it again at 300mm and maybe 40 or 45 minutes to see what I can do. Your pic gives me a good standard of reference to work towards.

Glad you had better guiding last night. Can't imagine what is going on with your CG5. The only thing that I can think of that might do it is clutch slippage. But then I'm a newbie to all of this! Hope it just goes away for you.



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