Phase Telescope with reticle

Everything relating to microscopy hardware: Objectives, eyepieces, lamps and more.
Post Reply
Message
Author
carlh6902
Posts: 131
Joined: Wed Mar 04, 2015 2:24 am
Location: Olathe, KS
Contact:

Phase Telescope with reticle

#1 Post by carlh6902 » Wed Aug 19, 2020 4:58 am

Has anybody ever tried to add a reticle, such as a crosshatch, to a phase centering telescope?

Carl
--- If you're in the Kansas City area and you need help with an Olympus BH-2 scope, PM me. I love to work on these things ---

hans
Posts: 609
Joined: Thu May 28, 2020 11:10 pm
Location: Southern California

Re: Phase Telescope with reticle

#2 Post by hans » Thu Aug 20, 2020 3:43 am

Not exactly a reticle but I have a bent sewing pin inside mine to act like a pointer. The eyepiece (which screws out as a unit) appears to be Ramsden with something like 10 mm focal length and field number around 5 mm. The threads between the eyepiece and inner tube are fairly precise and can be left loose giving +/-1 mm range to focus the pointer.
Attachments
hilfsmikroskop-disassembled.jpg
hilfsmikroskop-disassembled.jpg (89.88 KiB) Viewed 577 times
hilfsmikroskop-needle.jpg
hilfsmikroskop-needle.jpg (90.74 KiB) Viewed 577 times

abednego1995
Posts: 108
Joined: Thu Dec 15, 2016 6:32 am

Re: Phase Telescope with reticle

#3 Post by abednego1995 » Thu Aug 20, 2020 5:25 am

Elaborating on Hans's post, assuming you have a phase telescope that is of Keplarian make, there is a virtual image of the objective back focal plane (BFP) to be observed just below the eyepiece. So if you can add a reticle at that plane, that will enable you to superimpose it on the BFP image. Just curious, but why do you want a reticle on one?

Cheers,
John

carlh6902
Posts: 131
Joined: Wed Mar 04, 2015 2:24 am
Location: Olathe, KS
Contact:

Re: Phase Telescope with reticle

#4 Post by carlh6902 » Fri Aug 21, 2020 1:42 am

Thanks for the replies. For those curious, Olympus used a similar device to look into the light inlet port of the BHS scope, to collimate the substage lighting and field diaphragm.

Carl
--- If you're in the Kansas City area and you need help with an Olympus BH-2 scope, PM me. I love to work on these things ---

Post Reply