STARTEST IMAGES GALLERY

 Refractor 80_4

Type: Refractor Doublet
Aperture: 80mm
Focal length: 480mm (f/6)

startest Images copyright
Markus Ludes (c) 2001

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Inside Focus

Inside Focus

Outside Focus

Outside Focus

“Here’s a sample of a 80F/6 doublet. The spherical correction looks a little bit better than refractor100_2 , but colorcorrection is a bit worse. The image shows significant astigmatism. Since this model did not allow changing the setup of the doublet customers cannot fix this astigmatism themself. My rating here is about 1/3 wavefront and maybe 1/15 RMS or less, not taken the astigmatism in account”

Markus Ludes (APM-Telescopes)

Note: the two sets below are from the same type of telescope but represent two other examples

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