Scope Easy-Reference Cards

[Captain Scarlet]

I finally got around to printing up and laminating a set of "scope cards", a list of easy references providing magnification/exit pupil/field-of-view for every eyepiece for each of my scopes. Also at the bottom a "star-test" guide, showing

1. how many full turns of the focuser's fine-focus knob I need to provide 10 wavelengths of defocus aberration (for star-testing) and

2. how many millimetres of knob-travel I need for 1/8-wavelength defocus (i.e. how far before defocusing should become noticeable, i.e. a depth-of-field distance, in units of knob-travel).

Ably helped hindered by a furry companion...

 

Edited March 12, 2020 by Captain Magenta

[michael8554]

Very nice !

I have just one, an aide memoire on which way to move my pier-mounted wedge for the once in a blue moon Drift Align.

How long have you had the Leopard .........?

[Captain Scarlet]

The Leopard is an F3 Savannah, 6 years old, one of a pair of sisters who together with a boy Bengal, rule our household with an iron paw

[michael8554]

Just googled that - lovely plumage, not sure about the ears. 

Bengal more my style. 

Michael

Edited March 13, 2020 by michael8554