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Tuesday, May 31, 2011

114mm Reflector and 70mm Refractor Saturn

I got so used to using the 127mm refractor, I had forgotten the difference between it and the other 2 scopes.

I took a few avi's using each of the 2 scopes.  I normally wouldnt post images like this, but I thought I'd put em up just as a comparison.

The first is from the reflector.  I just could not get good focus.  I checked and made some slight adjustments to the collimation, and star testing showed it to be pretty close.  I did make some small adjustments however.  Anyway, here is the sample image from the reflector:  As you can see, the focus is terrible.  Some of this could be in the clock drive.  By looking at this image, I am thinking that much of the blur came from the clock drive.  You can see blur below the image.

Star testing does show a decent pinpoint in focus, and equal appearance inward and outward focus.
This is from the 70mm refractor.  Because of the lower amount of light captured with these telescopes, I had to run up the gain in the cameras to get an image, and I did not take a flat to get rid of the diagonal lines.  I am seeing the dark northern band and maybe the Cassini, but its difficult to tell, as the diagonal lines produced from the camera makes it hard to tell if I actually resolved it or not.  Seeing appeared to be pretty good, as the stars were quite steady, and the sky seemed reasonably transparent tonight.  So anyway, here is a comparison using the smaller scopes.  There are a number of photos already on here to compare to the 127mm.


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