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Old 17-10-2010, 09:24 PM
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h0ughy (David)

h0ughy is offline
Join Date: Apr 2005
Location: NEWCASTLE NSW Australia
Posts: 31,224
Originally Posted by Martin Pugh View Post
Hello everyone
I said I would come back and let you know what I opted for.
I bought the new Canon T2i Rebel (550D), and sent it off to Hap Griffin straight away to have it modded while I worked through the manual.

I then did a lot of reading about lenses and opted for a fixed FL, the 85mm f1.8 USM lens.

I received that yesterday, and mounted the camera next to my FSQ and off I went.

I have to say I am shockingly disappointed. The first images (60 secs, ISO 800) were just terrible. Huge coma. I also thought I had achieved a good focus, but the images were dreadfully out of focus, suggesting th lens focus position moved during a slew.

I stopped the lens down 2 stops to f2.2, to no avail. So I will try f4 next.

I thought the fixed focal length lens were supposed to be far superior to telephoto lens. I also understand this is an APS-C format camera, so it physically isnt full 35mm frame format, like the 1D etc.

So, right now, very disappointed.

tips anyone?

do you have a few of the shots to show. dew straps are a bugger at times because as you slew they move the focus - many a time has this happened. It could well be that the mod you had done was not placed back in the right position? when you use autofocus is it sharp - it may need adjustment? i use a bhatnov focus mask - which works very well with the live view
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