410Re: [ccd-newastro] Uploaded new images
- Oct 1, 2000Good Morning Ron:
An interesting discovery! I am almost afraid to ask how you came up with
this method <g>.
I presume the t-shirt should be white. Is that correct? Also, can the
images be taken any time of the day or is toward evening better?
I will give this a try with the fastar set-up and a dew shield. I'll place
the image in the files section for your evaluation.
> The best method I've found for flat fielding isn't in that chapter; Iinvolves
> discovered it just two days ago. <g> I'll be adding it shortly.
> I'm not sure, though that it will work with the Fastar. The method
> placing a t-shirt over the front of the scope. With a conventional setup,them,
> you can simply stretch the t-shirt across the opening. You then take a
> daylight images with a very short duration, maybe 4-6 of them, average
> and you have a superb flat field.If
> It's worth a try with the faster setup, but the problem may be that the
> shirt can't be easily stretched flat because of the camera sticking out.
> you have a dew shield, it would be worth a try, but if you don't use thedew
> shield when imaging, it might give you a flat that won't be quite right.
> This would have to be tested to find out.
> Otherwise, I would think that a twilight flat or a dome flat would be most
> effective with the Fastar setup.
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