Wes James
Postmaster
Reged: 04/12/06
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5289662 - 06/26/12 08:07 AM
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Would love to see some drawings/pictures of some of this... for us "visual" learners!
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Wes James]
#5289697 - 06/26/12 08:35 AM
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Quote:
Would love to see some drawings/pictures of some of this... for us "visual" learners!
Will start a thread on ATM forum and post link on this thread.
Still waiting on parts and finalizing construction details.
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GlennLeDrew
Postmaster
Reged: 06/18/08
Loc: Ottawa, Ontario, Canada
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5289884 - 06/26/12 10:31 AM
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One would be tiltable in the fore-aft direction, which would cause the image to move up-down. The other would rotate about the optical axis (as coming from the objective, not that as reflected), which would cause the image to move L-R. As long as reasonable care has been exercised in the dimensioning of components and their placement, the rotation of the one mirror in order to effect collimation will be so slight that image rotation will not be an issue.
When I first assembled the 5" f/5, I had adjusted the tiltable mirrors on the rear assembly merely by eye. When I attached this unit to the body, the bino was not far from collimation, only small adjustments being required. I say this to assure you that as long as you observe (my version) of the carpenter's dictum which states, "measure thrice, cut once", your bino will come together nicely and perform splendidly.
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: GlennLeDrew]
#5289934 - 06/26/12 11:04 AM
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Glenn
Just ordered 2 of these....using 1 box design and collimate with secondary holders.
http://www.astrosystems.biz/sechold.htm
Edited by Mr. Bill (06/26/12 01:51 PM)
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5290201 - 06/26/12 01:41 PM
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Looks like all the bits and pieces will show up by end of week.
Soon as I verify a few measurements (like back focus through diagonals), I can draw up the dimensions and start cutting box pieces.
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mercedes_sl1970
professor emeritus
Reged: 12/02/05
Loc: Canberra, Oz
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5291212 - 06/27/12 08:39 AM
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Looking forward to following the build of these binos. Should be fascinating.
Andrew
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: mercedes_sl1970]
#5291920 - 06/27/12 05:22 PM Attachment (91 downloads)
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Finished layout...cut box pieces out of cabinet grade birch plywood.
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5291961 - 06/27/12 05:41 PM Attachment (85 downloads)
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Diagonals (99% dielectric) and low profile helical focuser with 1 3/4 inch travel....
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5293500 - 06/28/12 03:57 PM Attachment (82 downloads)
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Box assembled and waiting for parts...
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Rich V.
Post Laureate
Reged: 01/02/05
Loc: Lake Tahoe area, Nevada, USA
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5293522 - 06/28/12 04:12 PM
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Moving along nicely, Bill!
Rich
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Rich V.]
#5293530 - 06/28/12 04:22 PM
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Yeah Rich....
I'm getting better at this box building after the 6 inch f/5 EE Barnard box considering the *BLEEP* radial arm saw I have.
The rail apparently has a slight amount of roll in it over full travel.
"Good enough for government work"....(I should know)
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Andresin150
Pooh-Bah
Reged: 08/14/07
Loc: Bogotá - La Calera / Colombia
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5293596 - 06/28/12 05:05 PM
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looks promising! 
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GlennLeDrew
Postmaster
Reged: 06/18/08
Loc: Ottawa, Ontario, Canada
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Re: 127mm f/5.5 binocular
[Re: Andresin150]
#5293634 - 06/28/12 05:35 PM
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A suggestion. Place a thin-walled divider between the two optical paths so as to ensure no light leakage through one objective onward to the opposite eyepiece. It may not be necessary--especially so if the optical path length from first mirror to focus is long--but it never hurts.
This is looking rather reminiscent of my first 5" build, of which I will eventually post photos, both of the outside and the innards. (But I made use of black anodized aluminum plates for both the objective cell and focuser/mirror system supports.)
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: GlennLeDrew]
#5293758 - 06/28/12 06:55 PM
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Thanks Glenn...wow, that's weird. I was JUST thinking about a divider between the objectives.
Will do.
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marcelof
sage
Reged: 05/24/10
Loc: Necochea,Bs As,Argentina
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5293984 - 06/28/12 09:32 PM
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It is the style box!!! I understand that to use pipes of aluminium would complicate the things and to raise the costs. We wait anxious for the results!!
Good luck! 
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: marcelof]
#5294807 - 06/29/12 12:33 PM Attachment (84 downloads)
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Box with divider on mount...
Secondary holders on truck for delivery, according to UPS tracking so I will be able to put together at least one side to check out this weekend.
3.1 mirror and flocking material (the last of parts ordered) should show up today or tomorrow....
Got my fingers crossed that I got it right on paper...
Edited by Mr. Bill (06/29/12 01:14 PM)
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5295549 - 06/29/12 09:39 PM Attachment (77 downloads)
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First light with one side....other 3.1 mirror hasn't arrived...maybe tomorrow.
Collimation appears to be fairly straightforward (at least for one barrel.)
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5295596 - 06/29/12 10:10 PM Attachment (68 downloads)
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Once I shorten long adjustment knobs, I can move diagonal back another inch and push components back further into lightcone, increasing edge of field illumination even more (about 60-70% now) Like to get 80% which I think is very doable.
I'll still have a couple of inches for hinged trapdoor in rear to tweak adjustments.
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Rich V.
Post Laureate
Reged: 01/02/05
Loc: Lake Tahoe area, Nevada, USA
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Re: 127mm f/5.5 binocular
[Re: Mr. Bill]
#5295660 - 06/29/12 11:10 PM
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Looking great, Bill. What is the minimum IPD as shown in the photo above when the diagonals meet?
Any sign of sag in the diagonal/focuser train?
The Bino Box lives!
Rich
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Mr. Bill
Postmaster
Reged: 02/09/05
Loc: Northeastern Cal
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Re: 127mm f/5.5 binocular
[Re: Rich V.]
#5295668 - 06/29/12 11:23 PM
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Minimum IPD as shown around 65mm (can get less by offsetting)...mine is 67mm. I probably could have increased objective spacing, but things worked out OK. Whew!!
Optical train looks very robust....still lots of tweaking but looks like everything will work out.
That's a relief after spending $2K betting on paper raytrace.
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