Re: eyepiece projection setup recommendations?


"Bill Vidicini" <will@xxxxxxxxxx> wrote in message
news:HITsf.10791$3Z.5445@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Actually, I'm one of the owners of a new, uncompressed frame capture CCD
> camera. I was wrong about the CCD... it is actually the same CCD used in
> the Lumenera 075 but this camera is made by Imaging Source. Sorry, I
> don't
> have its model number memorized. There was another post recently on the
> problems a fellow was having using his Lumenera with a Televue 3x-
> vignetting. Believe it or not, but when I used to use a webcam with the
> Televue 3x, there actually was some vignetting present. I doubt most
> folks
> notice this, but try the 3x barlow/ webcam combo on the sun (filtered of
> course!) and you'll see the vignetting. Another experiment to try is to
> center Saturn in your scope with the webcam/3x barlow combo, and then
> move
> Saturn to the edge of the field. Notice the gain dropoff! My conclusion
> has been that a Televue 3x really isn't suitable for webcamming because
> of
> the vignetting produced, as the other guy found out with the prior post.
> Yeah, I'm being the "squeeky wheel" here, but I need the maximum light
> preferably at all areas of the field of view, not just the center. I did
> find success with 2" sized Powermates though but unfortunately no 3x
> barlow
> in the 2" size (Televue, are you listening?).
>
> Therefore, now I'm looking at eyepiece projection. The higher end
> Televues
> or Pentax should be ideal and according to the WhatUSee program,
> vignetting
> shouldn't be an issue. Just finding the correct coupler is the
> challenge.
>
> BTW, George, to answer your question, I had used a Televue 3x with webcam
> directly inserted into it for quite some time successfully. There is
> some
> vignetting, as I mentioned above, but this really doesn't become an issue
> unless you decide to switch cameras and have a different CCD.
>
> Bill
>

Thanks, Bill. I've been thinking of buying a barlow for some time, but
didn't want to use it only for visual observation. Now that I see how
others are using them, I may throw down a few bucks and try it for myself.
I have a Cannon DSLR that I would like to use with a Barlow, and have two
1.25" adapters with the T-threads on one end, so mating the camera to the
barlow shouldn't be a problem for me. The only question at this point is
whether or not I can focus it, since when I use the Cannon at the focal
plane of my telescope, I have to rack the focuser nearly all the way in in
order to get anything in focus.

George

George


.

Relevant Pages

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