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 Post subject: Chainfail
PostPosted: Tue Apr 10, 2012 10:42 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
Since the sky was clearer than average and everyone else had a go at Markarian's Chain, I thought I'd join in too. It went downhill from there.

Firstly I wasn't entirely sure where it was. Saw galaxies but nothing that looked quite right? How far out was I? I was up there to start with and worked my way down in the end.

Tried using the Sigma 120-300 for the first time. It's overloading my mount. Wobbles like a wobbly thing that's wobbling. The first test shots have a funny vertical spike character to them. Fearing the optics were bad, I soon relaxed when I suspected mirror vibration. Switching into live view which disables the mirror fixed that. Phew!

I never had good polar alignment anyway, and 300mm was certainly showing up my weakness. I reverted to the old 135/2 and... it really sucks at full spectrum imaging with CLS filter. Even though I was using it on the unmodified 600D, I was getting a red halo around bright things. And it still didn't cut out enough light pollution so I had no depth to speak of.

It reminds me that I've considered my site as being really suitable for narrowband imaging only. So I can save a little cash and skip normal light pollution filters for whatever I get next.

Not a total loss. While I didn't get anything worth posting out of tonight, at least I know where to look if I get better conditions another time or place. Now, is there a big book of emission nebula I can look up?

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject: Re: Chainfail
PostPosted: Thu Apr 12, 2012 6:40 pm 
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Joined: Sat Oct 11, 2008 8:27 pm
Posts: 404
Location: Bristol, UK
This is down on my list, but unfortunately where I set up the chain is hidden by, erm, the house - d'oh!!!!

Do you have stellarium? I find the ocular plugin is great to establish what FL you need for an object.

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Lee Diggle
My Astronomy Blog | My Photography Gallery


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