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Triumph guy66

6d mod problem!

11 posts in this topic

Morning. I'm wondering if anyone can shed any light on my problem. I had my eos6d modded or astro and daytime use. Tried it last night with very unexpected results. 6d plus 4x power mate and field flattened on 100ed ds pro. light pollution is quite bad. I tried a cls clip filter but problem remained. Many thanks

20170420213830_IMG_0076.JPG

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Hi. Maybe reflections in the barlow, something isn't square or WHY. Maybe best without it. Could you post two flat frames?

1: Attach a Canon lens, set to Av and point at even daylight sky.

2: Same but attached to your telescope with the same orientation as you took the original snap. 

Edited by alacant
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I'm at work currently but should be able to sort something tonight . Here's another ive downliaddd off the camera just now without the power mate and with a field flattener. Shorter exposure time with  higher iso. I've noticed with lower iso and longer exposures the problem gets exponentially worse

20170420220523_IMG_0085.JPG

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Yep looking much better. Maybe something not quite square, but otherwise fine. Just lose the barlow;) HTH.

capt.JPG.a0a0e634ccda6c17196932877c68c6f3.JPG

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I need the power mate for the magnification especially as I'm using full frame. ( I know bit of an obvious answer sorry)

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Here's a shot with longer exposure lower iso. It's the shape of the vignetting that's bothering me. Lower left has a square shape almost like theirs either reflection bouncing back or somethings out of line

20170420221055_IMG_0087.JPG

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Elimination... So it's not the barlow. Do you have  a shot without the ff? Everything looks offset to the left. Does a laser or a pinhole with a torch shining through centred in the focuser hit the centre of the objective lens? Is your camera heavy enough to misalign the focus tube? HTH.

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By ff do you mean focal reducer? The shot with the Barlow didn't have the focal reducer on. The camera is heavy and extended quite far, though it was the same before the mod. Vignetting has always been a problem without the reducer  but never suffered from the squaring. Maybe I should send a shot to andy at astronomiser, he did the mod

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6 hours ago, Triumph guy66 said:

Morning. I'm wondering if anyone can shed any light on my problem......

20170420213830_IMG_0076.JPG

....I think you discovered a new comet!

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Have you blanked off the dslr viewfinder, as extraneous light gets in there?

Michael

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