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Observation by Peter Anderson: Comparison Achromat and ED star images -...

Uploaded by

Peter Anderson

Observer

Peter Anderson

Observed

2020 Mar 14 - 14:00

Uploaded

2020 Mar 23 - 11:20

Objects

Observatory
Rigel
Equipment

Equipment
  • 150mm F8 Achromat and ED optical tubes
Exposure

As per text

Location

Brisbane Australia

Target name

Rigel

Title

Comparison Achromat and ED star images -Rigel

About this image

This is a reduced image of a compilation showing the star images formed by each telescope. Because of the simpler draw tube on the achromat, there was definitely some off axis sagging when it was racked out using the barlow lens to record these images, so the images are not symmetrical.  The achromat optical tube has now been sold, so the experiment can not be repeated.

The purpose of the experiment was to compare the results between telescopes of identical aperture and focal length, using the same equipment (barlow lens & camera) at the same ISO and range of speed settings. 

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