Re: [ATM] Herschelian MMT (neat idea?)

["Jerry" <wa4guu@verizon.net>]

Why limit it to so few bino-viewers?  You could wiffle-tree a bunch of those
suckers together and make something that looks like a government flow chart
for getting VA benefits.

Jerry


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Mike Carambat
Sent: Thursday, March 08, 2007 11:52 AM
To: atm@atmlist.net
Subject: [ATM] Herschelian MMT (neat idea?)

Hey guys,

Got another wacky idea...

I've been playing around with Herschelian designs, and
the obvious drawback with them is you need REALLY long
scopes to give you a high enough F ratio to minimize
the abberation inherent in the tilted mirror design. 

This means that even an 8" F12 would have to be nearly
8' long and that results in a Herschel with near
visible abberations. I'm aware of the Yolo and
Scheifspeigler designs and their multitudes of
variants, but I've got a much simpler, easier to build
idea...

What about using (2) 6" F12 Herschelian scopes rigged
up one on top the other in parallel, with a binoviewer
hooked up backwards to the eyepieces (you'd have to
put right-angle erectors on each scope and put the
binoviewer in the middle). This would give you a
single eyepiece coming out the side and a neatly
combined image!!

I would guess that if you have 28.36^in of surface
area per 6" mirror you would have double that in
effect, total being 56.2^in. This is the same surface
area as a 8.5" diameter single mirror! And you get it
with two barrels only 6' long each, rather than one
big 8.5' one.

At first, I figured, why even use a reverse-binoviewer
to combine the images? Don't put it on, just view each
eyepiece from each scope, one in each eye, thus
yielding a cool stereo image. Great idea, but there
are so many complications involved in orienting the
eyepieces so you don't have to be stradling the scope
like a horse or laying on your back or side or titling
your head in an awkward direction.

Combining the images seemed to make a nifty solution
for this, and the binoviewer is a readily available
self-contained beam splitter assembly. Why reinvent
the wheel?

Just for funs, think of a 4 scope system. Even shorter
(around 3' long), using (4) 3" mirrors and three
binoviewers. :) (Okay, three binoviewers would be be
getting pretty expensive, but it would work, albeit
with a bit of light loss going through so many prisms)

So... in summary... a Multi-Mirror Herschelian scope
which gives the benefit of unobstructed, high f-ratio
viewing, but is easy to build and use and has more
aperature for it's length.

Any thoughts?

-Mike

Mike Carambat
Design Wizardry - http://www.designwizardry.com

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