Hi
I am mounting a front 100mm aperture ERF on a 110mm aperture F9.4 telescope 1035mm Focal Length telescope, stopped to about F10 by moved forward collimator lens, which is a PST Mod.
How much do I need to tilt the ERF? Does the reflection need to be outside the focal plane image or some point in front, the position of the PST collimator lens or its original position where the holder is acting as a baffle?
Andrew.
Tilt needed on a front ERF?
-
- Way More Fun to Share It!!
- Posts: 1462
- Joined: Fri Mar 30, 2018 6:46 am
- Location: Derbyshire UK
- Has thanked: 3317 times
- Been thanked: 1907 times
- Merlin66
- Librarian
- Posts: 3972
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 174 times
- Been thanked: 619 times
- Contact:
Re: Tilt needed on a front ERF?
I mount the D-ERF with a 1 -1.5mm tilt.
That's usually enough to prevent issues.....
That's usually enough to prevent issues.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- Bob Yoesle
- Almost There...
- Posts: 996
- Joined: Thu Mar 08, 2012 7:24 pm
- Has thanked: 541 times
- Been thanked: 811 times
Re: Tilt needed on a front ERF?
I recall the general parameter for both external and internal filter tilts is about 2 degrees.
Diagonally parked in a parallel universe.
Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
Goldendale Observatory
Curiosity is the father of knowledge; uncertainty is the mother of wisdom.
Dark-Sky Defenders
Goldendale Observatory