Quote:
Originally Posted by Garbz
Does the 6D have a shutter on the viewfinder? I got a similar image last year when light actually got in through the viewfinder of the camera.
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No shutter - you just put the lame cover on it that's part of the neck-strap. I've forgotten it before, but I just checked - it's still secure.
Quote:
Originally Posted by naskies
I've also started getting similar rings since switching 2" nosepieces from a Baader to a Moonlite nosepiece. In my case, I think it's internal reflections off the Moonlite nosepiece as it's quite shiny (the Baader is much duller). It completely disappears with flat frames, so I'm not terribly worried about it.
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I just checked my focuser - it's not shiny inside, it's quite matt really and didn't seem to overly reflect the light.
Quote:
Originally Posted by naskies
Flat frames are easy to take using the "white T-shirt method". A couple of hours after dawn / before dusk, point the scope at a patch of clear sky in the opposite direction to the sun, place a white T-shirt or towel over the scope, and adjust your exposure duration until you get a middle-histogram exposure. Take a reasonable number of exposures (say 30+). It'd be a good idea to take "dark flats" too - same as normal darks, but with equal duration to the flat frames.
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Who wears white t-shirts?
However, I'll see what I can dig up in the short term. I was planning on creating a light box, but I need to work out what this problem is now, so I'll try that way.