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Search: Posts Made By: Tringa45
Forum: Meopta Today, 13:51
Replies: 8
Views: 117
Posted By Tringa45
Since 2016 my wife has her third 7x42 Meostar....

Since 2016 my wife has her third 7x42 Meostar. The first two were replaced under guarantee due to minor defects, i.e. the 2005 purchased example due to split armouring and the ca. 2012 example due to...
Forum: Swarovski Friday 13th September 2019, 13:48
Replies: 18
Views: 646
Posted By Tringa45
Tom, I don't think that rolling ball is related...

Tom,

I don't think that rolling ball is related to aperture but nevertheless, the 10x50 EL will be somewhat less susceptible to it than the 10x42: http://holgermerlitz.de/newk/images/newk.jpg

On...
Forum: Spotting Scopes & tripod/heads Friday 13th September 2019, 10:28
Replies: 25
Views: 756
Posted By Tringa45
Hermann & Joachim, On that monocular info site...

Hermann & Joachim,

On that monocular info site you linked, there is also a reference to the Docter Aspectem 60/375 and 80/500 spotting scopes.

John
Forum: Spotting Scopes & tripod/heads Thursday 12th September 2019, 14:38
Replies: 9
Views: 411
Posted By Tringa45
Bob, I've never understood why the majority of...

Bob,

I've never understood why the majority of monopods are so massively over-engineered and why most of them are too short. Perhaps stiffness is required for supporting a 600 mm f/4 camera lens...
Forum: Binoculars Thursday 12th September 2019, 12:54
Replies: 16
Views: 531
Posted By Tringa45
I am trying to resolve an apparent contradiction,...

I am trying to resolve an apparent contradiction, but some of this is getting very OT.

@ Mark & Binastro, I did write "potential" and qualified that with transmission losses and dilated pupils. I...
Forum: Spotting Scopes & tripod/heads Wednesday 11th September 2019, 22:04
Replies: 25
Views: 756
Posted By Tringa45
Thank you, Hermann. I think that's a very...

Thank you, Hermann. I think that's a very realistic assessment.

IIRC Zeiss-Jena or maybe even Docter used to produce a scope in 60 mm and 80 mm versions that looked very much like half an Aspectem....
Forum: Binoculars Wednesday 11th September 2019, 20:56
Replies: 16
Views: 531
Posted By Tringa45
How Binoculars and Telescopes Work

This may seem obvious to many, but I'll explain my reasons for posting later.

A telescope or binocular can be regarded as a "light-funnel" in which light is collected in a large diameter objective...
Forum: Leica Wednesday 11th September 2019, 15:30
Replies: 35
Views: 911
Posted By Tringa45
These appear to be Galilean binoculars like the...

These appear to be Galilean binoculars like the Vixen SG 2,1x42.
The deeper you crawl into them, the greater the FOV :-O
Nigh-on useless for glasses wearers though.

John
Forum: Binoculars Wednesday 11th September 2019, 15:06
Replies: 51
Views: 1,718
Posted By Tringa45
Bill, I would agree that the ISO method is...

Bill,

I would agree that the ISO method is preferable to the simple calculation as it eliminates the tangent error and is more accurate at lower magnifications and wider fields. It is also used by...
Forum: Leica Wednesday 11th September 2019, 14:40
Replies: 35
Views: 911
Posted By Tringa45
Swarovski's new 8x30 CL is an excellent little...

Swarovski's new 8x30 CL is an excellent little binocular with very good ease of view, even for glasses wearers, but the "Randpupille" is almond-shaped, which is not surprising considering the...
Forum: Spotting Scopes & tripod/heads Wednesday 11th September 2019, 13:04
Replies: 9
Views: 411
Posted By Tringa45
A binocular or scope has six degrees of freedom,...

A binocular or scope has six degrees of freedom, linearly in the x,y and z axes and rotationally in these three axes, i.e. pitch, yaw and tilt.

The combination of monopod and shoulder stock would,...
Forum: Spotting Scopes & tripod/heads Tuesday 10th September 2019, 08:33
Replies: 5
Views: 318
Posted By Tringa45
Then it sounds as if you have quite strong...

Then it sounds as if you have quite strong astigmatism in your viewing eye and need a cylindrical correction in your glasses.
I'm not familiar with Nikon eyepieces, but believe yours is intended for...
Forum: Spotting Scopes & tripod/heads Monday 9th September 2019, 22:33
Replies: 25
Views: 756
Posted By Tringa45
Just to clarify: the magnifications I use on the...

Just to clarify: the magnifications I use on the Kowa 883 are often limited by the atmospheric conditions, not by the scope itself. I have measured mine on a USAF chart at 1,41", where the Dawes...
Forum: Spotting Scopes & tripod/heads Monday 9th September 2019, 21:52
Replies: 5
Views: 318
Posted By Tringa45
With the 27x eyepiece on your scope, the exit...

With the 27x eyepiece on your scope, the exit pupil is less than 2 mm, so unless you have severe astigmatism (a large cylindrical correction) in your viewing eye, I don't think the use of your...
Forum: Spotting Scopes & tripod/heads Sunday 8th September 2019, 19:16
Replies: 25
Views: 756
Posted By Tringa45
David, We're talking about birding applications...

David,

We're talking about birding applications at or near ground level with birding scopes, which almost invariably have objective diameters less than 100 mm. Even Henry's use of 100x involves an...
Forum: Spotting Scopes & tripod/heads Sunday 8th September 2019, 12:34
Replies: 25
Views: 756
Posted By Tringa45
Hermann, In retrospect the 40x magnification I...

Hermann,

In retrospect the 40x magnification I achieved as the upper limit for a bright image was probably dictated by my own pupil size under those ambient conditions, but I was reminded of your...
Forum: Binoculars Saturday 7th September 2019, 23:18
Replies: 51
Views: 1,718
Posted By Tringa45
Daniel, Your fifth photo is an excellent...

Daniel,

Your fifth photo is an excellent illustration of one of the qualities of this binocular (I too own one).
The exit pupil of the right barrel (what Swarovski call the Randpupille) is about to...
Forum: Spotting Scopes & tripod/heads Saturday 7th September 2019, 21:39
Replies: 17
Views: 621
Posted By Tringa45
A red light source is probably less than ideal...

A red light source is probably less than ideal for a star test. I recall seeing some Strehl values for a Takahashi fluorite doublet apo. It was really outstanding across most of the spectrum but...
Forum: Spotting Scopes & tripod/heads Friday 6th September 2019, 19:57
Replies: 11
Views: 361
Posted By Tringa45
I doubt that the objective contains a fluorite...

I doubt that the objective contains a fluorite (calcium fluoride crystal) element. More likely is a fluoride containing glass such as Schott FK-5.
The major producer of fluorite lens elements is...
Forum: Spotting Scopes & tripod/heads Friday 6th September 2019, 10:29
Replies: 25
Views: 756
Posted By Tringa45
Exit Pupil Constraints

A local saying goes that every fool is different and my folly, as far as scopes are concerned, is the aesthetics of the view.
While out birding yesterday I was able to view a Wood Sandpiper (Tringa...
Forum: Tripod and Heads Wednesday 4th September 2019, 19:39
Replies: 17
Views: 500
Posted By Tringa45
I too would recommend the Manfrotto 128 and...

I too would recommend the Manfrotto 128 and suggest that you get the 128LP (without QR) instead of the 128RC.
Mine is mounted on an old Aluminium Gitzo Series 4 with a total weight of 4 kg, so it's...
Forum: Spotting Scopes & tripod/heads Saturday 17th August 2019, 22:56
Replies: 15
Views: 630
Posted By Tringa45
On my filtered and tripod-mounted 65 mm birding...

On my filtered and tripod-mounted 65 mm birding scope at 30x it was a comfortable view, but with an angular diameter of 13" at 3x would be beyond the visual capabilities of most of...
Forum: Spotting Scopes & tripod/heads Friday 16th August 2019, 19:27
Replies: 15
Views: 630
Posted By Tringa45
Pluto, Although I would not describe myself as a...

Pluto,

Although I would not describe myself as a hobby astronomer, I think I can say that a good birding scope will open up possibilities for astronomical obsevations that no birding binocular...
Forum: Binoculars Wednesday 14th August 2019, 10:38
Replies: 12
Views: 943
Posted By Tringa45
Canip's Website

AFIK Canip (aka Pinac) has in his modesty never posted a link to his own website: https://binocular.ch/
It's truly excellent and should be essential reading for any beginner. Perhaps he and Lee could...
Forum: Tripod and Heads Tuesday 13th August 2019, 21:22
Replies: 14
Views: 477
Posted By Tringa45
As Daniel suggested, a smaller scope for...

As Daniel suggested, a smaller scope for travelling might be worthwhile and the obvious solution would be a 65 mm objective for your ATX.

I wouldn't have any reservations about putting a tripod in a...
Showing results 1 to 25 of 290
 


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