star test images

Hi,
Does anyone have actual star test images from a 100mm ed that they can post?
Thanx

The best resource I've seen so far(other then books):

http://aberrator.astronomy.net/scopetest/

oren.

Hi All,

A confirmed refractor addict, I am now dealing with a 6 inch f/12 refractor, a decade old, very little used. Images of Jupiter and the moon are very crisp and clear. I have never seen so much detail on the Jovian surface. The star test is damned near perfect with crisp rings and nice symmetry and no abnormal spots. Jupiter and Luna show no false color. Yet the interface between white moon and black sky is less abrupt than I would like. When I put a Cheshire in the back of the 'scope and drop the lens cap on and light up the Cheshire, the smaller ring is NOT centered but rather is on the edge of the larger. Putting in a diagonal and repeating, I can see that if I loosen the Cheshire in the diagonal and torque the Cheshire in one direction the rings nearly overlap, while torquing it the other way brings them farther apart. This implies to me that the wave front is not flat and that the triplet must thus be a wee little bit out of alignment with the tube.

Given the fine star test and images, is this worth pursuing? Would I see BETTER stuff, perhaps more contrast, if the Chesire showed perfect alignment? Being a surgeon, I am reminded that at times, Perfect is the Enemy of Very Good...

Ciao

Robert Howe

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