Image of the day

From the
ATWB Customer Gallery

The Cygnus Wall in the North American Nebula, NGC7000

My Account

New to Astromart?

Register an account...

Need Help?

New homemade BV project

Started by JamesMiller, 05/18/2006 01:10PM
Posted 05/18/2006 01:10PM Opening Post
I had some good success with the Nikon binoviewer I built, so
I decided to try another.

I just got another bino head from a microscope, and this one
is interesting. It has no brand identifier that I can find on it.
The unique (possibly) part is it uses a cube beamsplitter at the
entrance, and mirror flats after that.

Anyone have any idea of the positive/negative impact of this design?

My time is REALLY tight these days, so I don't know if or when I'll
be able to start this, but I'm open to any ideas or suggestions.

And, if I can't get to it in a reasonable time (or I lose interest,
which could happen) it'll turn up here for sale to anyone else who
has an idea to make their own. So if that's you, look for it!



"Don't drop the banana!"
"Why not?"
"Good source of potassium!"
Posted 05/18/2006 04:52PM #1
I'm looking for one of those old nonflexing microscope binoviewers to make a one-piece binoscope viewer out of- I'll subtract out the beamsplitter and try to attach mirrors or prisms to the focus tubes facing sideways. It won't be a binoviewer anymore but might be more convenient than the usual jerry-rigged focuser assemblies people use on refractor binoscopes these days. Of course it might help to have bigger tubes for bigger ep's, but this will just be a proof-of-concept experiment anyhow.

Jess Tauber
Posted 05/19/2006 08:37AM #2
Jim Miller said:
Anyone have any idea of the positive/negative impact of this design?

Prisms (if using total internal reflection, high
index glass, and coatings) can have very high
throughput, but can also introduce spherical
aberration in fast (F<6) beams.

Mirrors will tend to have lower throughput
(85% - 95% for typical coatings) but do not
introduce spherical aberration.