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Search: Posts Made By: henry link
Forum: Binoculars Today, 00:20
Replies: 58
Views: 1,548
Posted By henry link
I think this is the only Zeiss cutaway from my...

I think this is the only Zeiss cutaway from my brochure collection that hasn't already been posted: the 20x60 S.

The wide air spaced Tele-objective, Porro II prism, Rhomboid prism and familiar 5...
Forum: Binoculars Monday 27th January 2020, 16:21
Replies: 58
Views: 1,548
Posted By henry link
Excellent work, Lee! All mysteries solved. I...

Excellent work, Lee! All mysteries solved. I guess it pays to know people in high places. ;)

Henry
Forum: Vortex Sunday 26th January 2020, 16:02
Replies: 102
Views: 2,804
Posted By henry link
As the (perfectly reasonable) limitations of...

As the (perfectly reasonable) limitations of Vortex warranty have emerged it seems that Dennis's binocular, at first thought lost in deep water, has miraculously been recovered in the shallows.
Forum: Binoculars Sunday 26th January 2020, 15:27
Replies: 58
Views: 1,548
Posted By henry link
John, Thanks for the Zeiss 8x56 FL and...

John,

Thanks for the Zeiss 8x56 FL and 8/10x42mm FL clarifications. Now I'd be obliged if you could find an 8x56 FL eyepiece image with an arrow pointing to the field lens and a label that reads...
Forum: Leica Saturday 25th January 2020, 22:15
Replies: 487
Views: 25,765
Posted By henry link
Why not?

Why not?
Forum: Vortex Saturday 25th January 2020, 19:13
Replies: 102
Views: 2,804
Posted By henry link
Read the last line.

Read the last line.
Forum: Binoculars Saturday 25th January 2020, 17:57
Replies: 58
Views: 1,548
Posted By henry link
It still has to be one of the 56mm Victory Mk I...

It still has to be one of the 56mm Victory Mk I models, because the hinge details visible at the bottom match only the Victory MK I, not the Victory FL.

I think the "4 pce objective" probably...
Forum: Leica Saturday 25th January 2020, 17:38
Replies: 487
Views: 25,765
Posted By henry link
Thanks for the fine review Patudo. Unfortunately,...

Thanks for the fine review Patudo. Unfortunately, as you noted the optical design of Retrovids is completely modern, with no resemblance to the original Trinovid design, so we still don't know what...
Forum: Binoculars Saturday 25th January 2020, 17:23
Replies: 58
Views: 1,548
Posted By henry link
Hi Lee, If it came from Allbinos they originally...

Hi Lee,

If it came from Allbinos they originally mislabeled that cutaway of the Victory as a Victory FL. I thought Arek was going to fix it. Maybe he didn't get around to it or the original...
Forum: Binoculars Saturday 25th January 2020, 17:03
Replies: 58
Views: 1,548
Posted By henry link
The plot thickens. This image comes from a May,...

The plot thickens. This image comes from a May, 2000 Zeiss binocular brochure, which only includes the 8x56 and 10x56 Victories, no 12x56. It sure looks like a photo of a real binocular that says...
Forum: Leica Saturday 25th January 2020, 15:28
Replies: 487
Views: 25,765
Posted By henry link
The 7x42 Dialyt's AK prisms don't need mirror...

The 7x42 Dialyt's AK prisms don't need mirror coating, silver or otherwise. If your pair appears yellow that probably reflects the particular generation of the T* coating used on yours, which changed...
Forum: Binoculars Saturday 25th January 2020, 14:56
Replies: 58
Views: 1,548
Posted By henry link
Another thing just caught my eye about the 56mm...

Another thing just caught my eye about the 56mm Victory cutaway from post #17. The last two elements of the objective group are drawn as if they form a cemented doublet. According to the Walter...
Forum: Binoculars Saturday 25th January 2020, 13:48
Replies: 58
Views: 1,548
Posted By henry link
In some cases we may find it impossible to...

In some cases we may find it impossible to precisely identify different models in a series. I have a Zeiss brochure showing what appears to be a photo of an actual sliced 56mm Victory (I'll post...
Forum: Vortex Friday 24th January 2020, 22:09
Replies: 102
Views: 2,804
Posted By henry link
I'll just add one more thing. I don't think there...

I'll just add one more thing. I don't think there is any real need for further correction of longitudinal chromatic aberration in binoculars. That aberration has been thoroughly brought to heel in...
Forum: Vortex Friday 24th January 2020, 18:56
Replies: 102
Views: 2,804
Posted By henry link
Jan, We'd still need to know the glass types to...

Jan,

We'd still need to know the glass types to hazard a guess at what the minimum focal ratio needs to be. I guess I would add that this is a classic example of Bill Cook's "BB stacking". In this...
Forum: Binoculars Friday 24th January 2020, 16:52
Replies: 58
Views: 1,548
Posted By henry link
Looks like we need to reach some consensus about...

Looks like we need to reach some consensus about how to organize this effort. Holger has started this thread, but I see that John has also started a brand (and prism type) specific thread on the...
Forum: Vortex Friday 24th January 2020, 16:02
Replies: 102
Views: 2,804
Posted By henry link
OK, Dennis I'll go a little ways down the rabbit...

OK, Dennis I'll go a little ways down the rabbit hole with you, but then I'm out and back to the adult world.

First, we can't even speculate about how good the color correction of any 42mm triplet...
Forum: Vortex Thursday 23rd January 2020, 13:37
Replies: 102
Views: 2,804
Posted By henry link
Dennis, Sometimes a little alarm needs to go off...

Dennis,

Sometimes a little alarm needs to go off in your head when you encounter something in a review that doesn't make sense. In this case somewhat misleading cutaways have been uncritically...
Forum: Binoculars Thursday 23rd January 2020, 12:53
Replies: 58
Views: 1,548
Posted By henry link
Thanks, Holger I'll continue in the same vein by...

Thanks, Holger

I'll continue in the same vein by adding the Nobilem Super's replacement, the CZJ 8x50 Octarem (later renamed Nobilem). The Super's triplet objective has been replaced by a cemented...
Forum: Vortex Thursday 23rd January 2020, 03:50
Replies: 102
Views: 2,804
Posted By henry link
Where are you getting those numbers, Dennis? The...

Where are you getting those numbers, Dennis? The EDG and the HT have the common pattern of fixed triplets consisting of a singlet and a cemented doublet with an air space between, followed by a...
Forum: Vortex Thursday 23rd January 2020, 00:19
Replies: 102
Views: 2,804
Posted By henry link
Nearly every roof prism binocular has a 3 element...

Nearly every roof prism binocular has a 3 element objective lens now (4 if you include the focusing lens) and not one of them is a true APO, no matter what the marketing claims.

I can't see that...
Forum: Leica Wednesday 22nd January 2020, 20:22
Replies: 301
Views: 15,585
Posted By henry link
Thanks Jan, An amazing collection you have...

Thanks Jan,

An amazing collection you have there.

Maybe we could start a new thread devoted to just cutaways. I've collected some I could add and John Roberts must have dozens.

Henry
Forum: Leica Wednesday 22nd January 2020, 16:02
Replies: 301
Views: 15,585
Posted By henry link
Hey Jan, Which model SLC is that? It looks like...

Hey Jan,

Which model SLC is that? It looks like the prism design is the same as the diagram I posted, but the eyepiece and objective designs are different from the full diagram of the 7x42 SLC...
Forum: Leica Tuesday 21st January 2020, 14:19
Replies: 301
Views: 15,585
Posted By henry link
Thought I would add these screen captures of...

Thought I would add these screen captures of quotes from "Opto-mechanical Systems Design" by Paul R Yoder jr.

The reference to "Seil, 1991" is to Konrad Seil's 1991 paper "Progress in Binocular...
Forum: Leica Tuesday 21st January 2020, 02:29
Replies: 301
Views: 15,585
Posted By henry link
Thomas, Thanks for sending me back to the...

Thomas,

Thanks for sending me back to the drawing board. Once again I had to delete a post with incorrect information. My latest mistake resulted from second guessing something I thought I knew,...
Showing results 1 to 25 of 1000
 


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