Telescope Reviews: Re: Canon 400mm or 70-200mm?

Hi supercoolone,

I think that my story would help you a little bit, because I tried EF400mmF5.6L with EOS 5D before mod. once in 2006. I hoped the same as you do.

Here is a single-shot frame of Orion with EF400mmF5.6L at F5.6 and EOS 5D at ISO 640 on Takahashi EM-200 temma 2 jr. mount without autoguiding. Exposure was about nine minutes, one minute longer than the period of the equatorial mount. I reduced resolution a little down to 930 x 1395 pixels to hide some faults, and I succeeded partly, though I could not be satisfied with the result.
http://farm2.static.flickr.com/1254/1390467274_34d1cb3fba_o.jpg

Here is a 100% crop of the frame. This frame shows the real result. Stars look Z-shaped. It is due to periodic error of the mount on horizontal movement and my positioning error of the mount on vertical movement. The stars also show relatively clear chromatic aberrations near right lower corner of the original frame with the lens.
http://farm2.static.flickr.com/1228/1390497368_60cdd93b8d_o.jpg

I had no remote live-view with the first generation EOS 5D, and I am not sure now if it was focused properly, though I did my best as an amateur holiday astroimager with experience for three months. I abandoned the lens and started to prepare autoguiding system of the mount.

I do not think it easy to shoot with lenses more than 200mm in focal length without autoguiding.

--------------------
hiro

Canon EOS 5Dmk2-sp2 by Seo san
Takahashi FSQ-106ED with reducer, extender, and "hiro design" off axis guider
Lenses by Nikon, Leica, and Zeiss
Takahashi EM-200 temma 2 jr / Kenko Skymemo-R

http://www.flickr.com/photos/hiroc/

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