Re: Looking for Digital Camera Recommendations
From: matt (mariusrf_at_bellsouth.net)
Date: 08/17/04
- Next message: Tom Randy: "Re: moon sun and light"
- Previous message: Jon Isaacs: "Re: Looking for Digital Camera Recommendations"
- In reply to: Benign Vanilla: "Re: Looking for Digital Camera Recommendations"
- Next in thread: Jon Isaacs: "Re: Looking for Digital Camera Recommendations"
- Messages sorted by: [ date ] [ thread ]
Date: Tue, 17 Aug 2004 16:24:30 -0400
Benign Vanilla wrote in message <2of2soFa66mvU1@uni-berlin.de>...
>
>"matt" <mariusrf@bellsouth.net> wrote in message
>news:zHaTc.2001$rj.1561@bignews1.bellsouth.net...
><snip>
>> you *might* be able to use the lensless camera the way I did with my
>CP4500
>> . I removed the lens when I decided to use the camera only for astro .
>That
>> way it's like a regular astro CCD , works at prime focus . There are
>several
>> catches here. One is that the little motors that move the zoom, focus
and
>> iris need to remain attached , or else the camera software will signal
>some
>> error and halt (not allow you to take any pics) . The camera also needs
to
>> have manual modes , so that you can set the exposure time manually .
>
>How'd you attached it to the scope? This would be an awesome use of the CCD
>in this cam.
>
>BV,
>
>
I bought for a few dollars a Scopetronix T adapter for the CP4500 and am
using it at prime focus .
The camera is as made by Nikon, except all glass is removed from inside . It
could only be used now in manual mode and only with a scope . The iris is
removed too . I only left the front clear window and the IR filter plus the
plastic slides for the zoom and focus . These were needed because they have
some limit sensors and are read by the camera at startup and generate a
fault condition if missing . It was relatively easy surgery .
Next step is to make a cooled enclosure for the CCD swivel head (which is
now almost empty, the CCD circuitry is small, the rest was flash and
viewfinder) , adapt an external 6" color LCd for focusing (using the live
video output) , and do some real thorough tests .
Image scale is perfect for my C11 at 0.24arcsec/pixel prime focus at the
nominal F/10 , with a field of view of 10.5 x 7.5 arcmin , then
0.36arcsec/pixel and FOV of 11.5 x 16.3 arcmin with the x0.6 reducer.
I'm curious to see how good or bad this will be for planetary imaging using
stacking short exposures, and there are 2 ways to do it. One is to use the
camera as standalone, and either capture sequences on its flash or avi files
. The second method would involve capturing with a laptop and using the
video preview mode . I was unable to find any info regarding how the CCD is
read for the lower res modes , focusing and preview and if pixels are binned
or just decimated . If there's any binning, there should be some gains vs. a
webcam . Even without it, due to lack of compression there should be some
quality gain vs. webcam .
best regards,
matt tudor
- Next message: Tom Randy: "Re: moon sun and light"
- Previous message: Jon Isaacs: "Re: Looking for Digital Camera Recommendations"
- In reply to: Benign Vanilla: "Re: Looking for Digital Camera Recommendations"
- Next in thread: Jon Isaacs: "Re: Looking for Digital Camera Recommendations"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
