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Search: Posts Made By: Tringa45
Forum: Zeiss Friday 19th October 2018, 19:25
Replies: 6
Views: 246
Posted By Tringa45
Here is a thread I started four years ago:...

Here is a thread I started four years ago: https://www.birdforum.net/showthread.php?t=285031

John
Forum: Others Tuesday 16th October 2018, 11:04
Replies: 24
Views: 795
Posted By Tringa45
Adhoc, Binastro, In retrospect I think I...

Adhoc, Binastro,

In retrospect I think I approached this from the wrong direction in relating different circles of confusion to a specific distance instead of different distances to specific circles...
Forum: Binoculars Sunday 14th October 2018, 22:38
Replies: 19
Views: 570
Posted By Tringa45
Hello Arthur, As a New Yorker you may be unaware...

Hello Arthur,

As a New Yorker you may be unaware of the Cockney slang for the last of those - "trouble and strife"...........;)

John
Forum: Others Sunday 14th October 2018, 22:24
Replies: 24
Views: 795
Posted By Tringa45
IMO the claim of "Sports-Auto-Focus" is blatant...

IMO the claim of "Sports-Auto-Focus" is blatant BS and has probably done Steiner more harm than good.

The depth of field of a binocular is inversely proportional to the square of its magnification....
Forum: Binoculars Sunday 14th October 2018, 15:09
Replies: 19
Views: 570
Posted By Tringa45
That reminds me of a photograph of (I think)...

That reminds me of a photograph of (I think) Edward Weston's study. On the bookcase was a note, "I do not lend books to friends. I don't want to lose my books or my friends".

John
Forum: Kowa Saturday 13th October 2018, 14:47
Replies: 4
Views: 200
Posted By Tringa45
Hi Renze, Indeed it would have been less...

Hi Renze,

Indeed it would have been less ambiguous if Kowa had put plus and minus on the green armouring instead of on the dioptre setting.
IIRC I first saw the 33 mm Genesis models at Photokina in...
Forum: Kowa Friday 12th October 2018, 19:47
Replies: 4
Views: 200
Posted By Tringa45
The dioptre setting on my 8x33 Genesis is...

The dioptre setting on my 8x33 Genesis is correctly marked for an anticlockwise turn (as seen from the eyepiece) towards plus.

John
Forum: Swarovski Tuesday 9th October 2018, 22:25
Replies: 13
Views: 603
Posted By Tringa45
I'm guessing these are either the SLC 7x42B or...

I'm guessing these are either the SLC 7x42B or 10x42WB. I may have linked this https://www.juelich-bonn.com/jForum/file.php?9,file=769,filename=image.jpg before but here is a cross-section showing a...
Forum: Leica Saturday 6th October 2018, 19:28
Replies: 28
Views: 1,473
Posted By Tringa45
Theoretically perhaps, but would you ever be in a...

Theoretically perhaps, but would you ever be in a position to notice it?

John
Forum: Leica Saturday 6th October 2018, 19:06
Replies: 28
Views: 1,473
Posted By Tringa45
If that were the case, it might be detectable if...

If that were the case, it might be detectable if you had 20/10 VA and compared them on tripods.

John
Forum: Spotting Scopes & tripod/heads Friday 5th October 2018, 20:00
Replies: 7
Views: 232
Posted By Tringa45
Am I right in thinking you are going to need this...

Am I right in thinking you are going to need this foir target shooting?
This https://www.berlebach.de/?bereich=produkte&kategorie=1&sprache=english might suit your requirements. If you set the leg...
Forum: Binoculars Monday 1st October 2018, 20:49
Replies: 20
Views: 947
Posted By Tringa45
Hand-holding is not an option with approx. 3,5 kg...

Hand-holding is not an option with approx. 3,5 kg and 45 viewing. Binocular viewing is visually much more comfortable than extended monocular viewing and the 22x magnification would probably equate...
Forum: Interviews with Optics Retailers Monday 1st October 2018, 14:47
Replies: 19
Views: 680
Posted By Tringa45
Nice to see you taking the initiative, Lee, to...

Nice to see you taking the initiative, Lee, to provide insights that would probably be beyond the scope of individual members.
Thanks,

John
Forum: Binoculars Monday 1st October 2018, 13:49
Replies: 20
Views: 947
Posted By Tringa45
At Photokina last week I visited the United...

At Photokina last week I visited the United Optics stand. This is a Chinese manufacturer with a vast product range and is well known to Holger Merlitz. Holger did a comparison of their 10x50 ED with...
Forum: Tripod and Heads Monday 1st October 2018, 09:58
Replies: 3
Views: 301
Posted By Tringa45
New Gitzo 2-way Head

At Photokina last week I noticed a new Gitzo 2-way head, which would appear to be a substantial improvement on the old 2180, 1720 and 2720 heads.
It carries the reference GHF2W and is a mere 590 g or...
Forum: Leica Thursday 27th September 2018, 16:06
Replies: 73
Views: 3,613
Posted By Tringa45
Henry, Well one theoretical advantage of...

Henry,

Well one theoretical advantage of fluorite is its homogeneity, but if it's only one of fifteen elements that is probably of no consequence. Disadvantages are its vulnerability to moisture,...
Forum: Leica Thursday 27th September 2018, 14:35
Replies: 73
Views: 3,613
Posted By Tringa45
Hi Ron, AFAIK Kowa only use fluorite crystal in...

Hi Ron,

AFAIK Kowa only use fluorite crystal in their 55 mm and 88 mm scopes. The Genesis binoculars and some of their other scopes use so-called XD glass, probably containing fluorine ions.

I was...
Forum: Nikon Thursday 27th September 2018, 13:57
Replies: 22
Views: 934
Posted By Tringa45
Nikon EDG - a Simple Design?

I was at Photokina yesterday, where Nikon was one of the few remaining manufacturers exhibiting sports optics. They had a few examples of EDGs there, so it doesn't look as if they are to be...
Forum: Nikon Saturday 22nd September 2018, 22:27
Replies: 32
Views: 1,515
Posted By Tringa45
I believe that Henry Link stated that some old...

I believe that Henry Link stated that some old Porro binoculars with cemented doublets using traditional crown and flint glasses were better colour corrected than some roof prism binoculars with...
Forum: Binoculars Friday 21st September 2018, 11:48
Replies: 20
Views: 947
Posted By Tringa45
I had my 8x33 Kowa Genesis with me. Like to keep...

I had my 8x33 Kowa Genesis with me. Like to keep it light when I'm lugging the big scope around.

John

PS:- In retrospect perhaps I misunderstood your reference to magnifications over 10x. You...
Forum: Binoculars Thursday 20th September 2018, 20:38
Replies: 20
Views: 947
Posted By Tringa45
I would think it's significantly higher than...

I would think it's significantly higher than that. It just depends on your interests.
Despite advanced years I regularly lug an 88 mm scope around, total weight with CF tripod about 4,5 kg.
Yesterday...
Forum: Binoculars Thursday 20th September 2018, 12:16
Replies: 20
Views: 947
Posted By Tringa45
Big Binoculars for Birding - a Pipe Dream?

A recent thread on a German forum brought up this subject again and a reply by Holger Merlitz stated what should have been obvious all along, i.e. that it's not really technically feasible.

I'm sure...
Forum: Tripod and Heads Wednesday 19th September 2018, 18:48
Replies: 12
Sticky: A Tripod Primer
Views: 584
Posted By Tringa45
Hans, In the field I frequently see...

Hans,

In the field I frequently see photographers with SLRs and long lenses without any support at all, and I suspect that the use of monopods by many journalistic photographers at sporting events...
Forum: Binoculars Sunday 9th September 2018, 18:11
Replies: 71
Views: 3,541
Posted By Tringa45
Just a few corrections on the Meopta B1 Meostar...

Just a few corrections on the Meopta B1 Meostar 7x42. It's generally available here for about 760 and its FOV is 137 m @ 1000 m, or 411' @ 1000 yds. My wife has been using one since its introduction...
Forum: Nikon Friday 7th September 2018, 18:06
Replies: 23
Views: 1,108
Posted By Tringa45
No problem. I didn't examine the damage that...

No problem. I didn't examine the damage that closely after discovering it but the worse of the two dents extended acros the width of the objective surround (4 mm?) and was about 1 mm deep.
I rather...
Showing results 1 to 25 of 126
 


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