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Equipment Discussions >> Binoculars

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Wes James
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Reged: 04/12/06

Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5289662 - 06/26/12 08:07 AM

Would love to see some drawings/pictures of some of this... for us "visual" learners!

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Mr. Bill
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: Wes James]
      #5289697 - 06/26/12 08:35 AM

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
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5289884 - 06/26/12 10:31 AM

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: GlennLeDrew]
      #5289934 - 06/26/12 11:04 AM

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5290201 - 06/26/12 01:41 PM

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
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Reged: 12/02/05

Loc: Canberra, Oz
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5291212 - 06/27/12 08:39 AM

Looking forward to following the build of these binos. Should be fascinating.

Andrew


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Mr. Bill
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: mercedes_sl1970]
      #5291920 - 06/27/12 05:22 PM Attachment (119 downloads)

Finished layout...cut box pieces out of cabinet grade birch plywood.



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Mr. Bill
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5291961 - 06/27/12 05:41 PM Attachment (109 downloads)

Diagonals (99% dielectric) and low profile helical focuser with 1 3/4 inch travel....

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Mr. Bill
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5293500 - 06/28/12 03:57 PM Attachment (108 downloads)

Box assembled and waiting for parts...

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Rich V.
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Reged: 01/02/05

Loc: Lake Tahoe area, Nevada, USA
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5293522 - 06/28/12 04:12 PM

Moving along nicely, Bill!



Rich


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Mr. Bill
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: Rich V.]
      #5293530 - 06/28/12 04:22 PM

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
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Reged: 08/14/07

Loc: Bogotá - La Calera / Colombia
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5293596 - 06/28/12 05:05 PM

looks promising!

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GlennLeDrew
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Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: 127mm f/5.5 binocular new [Re: Andresin150]
      #5293634 - 06/28/12 05:35 PM

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: GlennLeDrew]
      #5293758 - 06/28/12 06:55 PM

Thanks Glenn...wow, that's weird. I was JUST thinking about a divider between the objectives.

Will do.



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marcelof
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Reged: 05/24/10

Loc: Necochea,Bs As,Argentina
Re: 127mm f/5.5 binocular new [Re: Mr. Bill]
      #5293984 - 06/28/12 09:32 PM

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular new [Re: marcelof]
      #5294807 - 06/29/12 12:33 PM Attachment (115 downloads)

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular [Re: Mr. Bill]
      #5295549 - 06/29/12 09:39 PM Attachment (105 downloads)

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular [Re: Mr. Bill]
      #5295596 - 06/29/12 10:10 PM Attachment (92 downloads)

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.
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Reged: 01/02/05

Loc: Lake Tahoe area, Nevada, USA
Re: 127mm f/5.5 binocular [Re: Mr. Bill]
      #5295660 - 06/29/12 11:10 PM

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
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Reged: 02/09/05

Loc: Northeastern Cal
Re: 127mm f/5.5 binocular [Re: Rich V.]
      #5295668 - 06/29/12 11:23 PM

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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