Thanks Doug that will work great for the camera comparison I need to do.

One more question, does anyone know the pixel size in the 216XT?

Thanks,
Rick



-----Original Message-----
Sent: Friday, May 18, 2001 10:33 PM
Subject: [M]: RE: Calculating CCD Pixel Size


Hi Rick,

I Think this is what your after, I want to know the same thing
so I created a spreadsheet to figure it all out for me and posted to my
website. take a look at http://carroll.dynip.com/other/ccdpss.htm
and see if it is what you need. you can download the spread from the
site.

Doug

-----Original Message-----
Foster, Rick
Sent: Saturday, May 19, 2001 12:10 AM
Subject: [M]: Calculating CCD Pixel Size



Does anyone know the formula for calculating CCD pixel size? What I am want
to know is how to calculate what pixel size is most covered by a certain
focal length/aperture. I have multiple purposes for this formula. I would
like to know when to use a 3.3 or 6.3 reducers or prime focus or when 2x or
3x barlow would be more appropriate. I currently have a 216XT and LX200 10"
F10. How do you compare that to an object's size? Is it merely
experimentation/preference or can some give me some pointers. The second
purpose is to determine which CCD camera to purchase, 6.7, 7.4 or 8.3 micron
pixel. I am trying to understand what it means to not be able to cover the
CCD image with a scope or is it vice versa. How do you use or can you use
the FOV formula with CCD cameras? How do you calculate the FL change because
of the position of the CCD camera (for example using an extender)? I am a
little (maybe a lot) lost. Earlier in the year, I have been successful at
getting pictures of M42, but not much else (I am focus challenged), but it
was small and did not fill the possible image size. It is so much work to
get the focus right with the mirror shift and blazing 216 speeds, that I
would like to know (by calculatation) that I am using the best equipment I
have for the current object.

Any help is appreciated and/or a good book suggestion too,
Thanks,
Rick
Tucson, AZ.

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