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Search: Posts Made By: Binastro
Forum: Binoculars Wednesday 16th January 2019, 15:40
Replies: 21
Views: 625
Posted By Binastro
I am not sure if this is valid, but I make 7mm...

I am not sure if this is valid, but I make 7mm and 2.5mm cross sections at the front of the eyeball, differing along the axis by 0.5mm.
Forum: Binoculars Wednesday 16th January 2019, 15:04
Replies: 21
Views: 625
Posted By Binastro
Our eyeballs are curved. Maybe this is the reason.

Our eyeballs are curved.
Maybe this is the reason.
Forum: Binoculars Tuesday 15th January 2019, 17:31
Replies: 31
Views: 1,017
Posted By Binastro
I am not surprised that many find a binocular...

I am not surprised that many find a binocular more relaxing than a scope, even if one eye is not so good.
This is probably because of the relaxed viewing, and hand held I find that a binocular is...
Forum: Spotting Scopes & tripod/heads Monday 14th January 2019, 20:40
Replies: 14
Views: 604
Posted By Binastro
Konus, not sure about that. B.

Konus, not sure about that.

B.
Forum: Binoculars Monday 14th January 2019, 17:30
Replies: 31
Views: 1,017
Posted By Binastro
The gain of 40% using a binocular instead of a...

The gain of 40% using a binocular instead of a scope assumes the observer has two equally good eyes and has no prism problems.
Many people have one eye better than the other, so the gain is less and...
Forum: Leica Sunday 13th January 2019, 16:55
Replies: 4
Views: 2,116
Posted By Binastro
Hi and welcome. They may be on holiday. Try...

Hi and welcome.

They may be on holiday.
Try again.
Forum: Binoculars Sunday 13th January 2019, 16:44
Replies: 24
Views: 887
Posted By Binastro
Hi cfranchi. I had the same problem regarding...

Hi cfranchi.

I had the same problem regarding flare control and have settled for an immaculate Leica 8x32 BA as the best all rounder that controls flare very well. I think that a Leica 8x32 BN would...
Forum: Binoculars Sunday 13th January 2019, 16:31
Replies: 16
Views: 988
Posted By Binastro
The problem with magazine reviews is that some...

The problem with magazine reviews is that some are clearly influenced by suppliers and advertisers.
Also the reviewers sometimes don't have much knowledge of optics, although this does not mean their...
Forum: Binoculars Saturday 12th January 2019, 17:35
Replies: 16
Views: 988
Posted By Binastro
Sky and Telescope binocular tests. These are...

Sky and Telescope binocular tests.
These are independent and are conducted by skilled testers.
However, they are from an astronomy perspective.
Also astronomers do not need some of the features that...
Forum: Pentax Thursday 10th January 2019, 20:06
Replies: 11
Views: 317
Posted By Binastro
The eyepieces have a value. The amount depends on...

The eyepieces have a value.
The amount depends on the eyepiece and condition.

However, there may be other scopes that they fit.
Forum: Spotting Scopes & tripod/heads Wednesday 9th January 2019, 16:12
Replies: 3
Views: 262
Posted By Binastro
I haven't seen or used these more expensive...

I haven't seen or used these more expensive folded refractor scopes, but the Yukon 6x-100x100 folded refractor that I have is optically good, but Yukon vary a lot in quality. It is very light weight...
Forum: Binoculars Wednesday 9th January 2019, 15:45
Replies: 3
Views: 222
Posted By Binastro
Hi Stevie, Maybe ask Action Optics, Southampton...

Hi Stevie,
Maybe ask Action Optics, Southampton or Ace Optics, Bath.
Forum: Binoculars Wednesday 9th January 2019, 15:35
Replies: 37
Views: 2,034
Posted By Binastro
Is there a connection between Optolyth Ceralin...

Is there a connection between Optolyth Ceralin coatings and Balzers Iralin coatings?

Were Optolyth optics in fact coated by Balzers?

I think that Balzers coated other binoculars besides Swarovski,...
Forum: Spotting Scopes & tripod/heads Tuesday 8th January 2019, 15:11
Replies: 11
Views: 307
Posted By Binastro
This looks a bit small, it could tip over with a...

This looks a bit small, it could tip over with a spotting scope.
This has been discussed before, but I cannot remember where.

It might be better to fix something to a desk or table if that is...
Forum: Spotting Scopes & tripod/heads Tuesday 8th January 2019, 11:47
Replies: 11
Views: 307
Posted By Binastro
Hi sixtus, I use old Slik 88 tripods, which weigh...

Hi sixtus,
I use old Slik 88 tripods, which weigh about 2.5 kg with a pan and tilt head.
Modern tripods may be lighter, but your height may require a tripod weighing 2.5kg with the head.

I...
Forum: Zeiss Monday 7th January 2019, 21:00
Replies: 9
Views: 435
Posted By Binastro
Hi Steve, welcome. It depends how soon you are...

Hi Steve, welcome.

It depends how soon you are going on the trip.

If there is enough time, maybe ask the dealer to obtain a perfect specimen.

However, even with top end binoculars there is optics...
Forum: Binoculars Monday 7th January 2019, 16:19
Replies: 37
Views: 2,034
Posted By Binastro
Thank you John for your detailed work. The...

Thank you John for your detailed work.

The Minolta achromatic or 2 layer coating was apparently available in 1958 on the Minolta Leica thread cameras.
I have one of these and will try to look at the...
Forum: Spotting Scopes & tripod/heads Sunday 6th January 2019, 17:47
Replies: 21
Views: 821
Posted By Binastro
For some reason my server does not allow me to...

For some reason my server does not allow me to read the shooter reference.

But in my head.
7mm holes at 1000 yds or 914m?
7mm at 914,000 mm.
1 part in 130,500.
206,000 divided by 130,000 is about...
Forum: Spotting Scopes & tripod/heads Sunday 6th January 2019, 17:22
Replies: 21
Views: 821
Posted By Binastro
An interesting story of a New Zealand telescope...

An interesting story of a New Zealand telescope maker, possibly Graham Loftus, was told to me.

A New Zealand professional observatory had a large telescope installed, maybe 24 inch or larger and...
Forum: Binoculars Sunday 6th January 2019, 16:34
Replies: 9
Views: 475
Posted By Binastro
Hi Terry, I have a 6x24 Amplivid and it is...

Hi Terry,
I have a 6x24 Amplivid and it is excellent, although low transmission as it uses mirrors with the prisms.

If yours is in good collimation I would think it is worth 500, possibly more if...
Forum: Binoculars Saturday 5th January 2019, 17:14
Replies: 21
Views: 687
Posted By Binastro
I often used 10x25 binoculars viewing from...

I often used 10x25 binoculars viewing from aircraft.

My friend uses the 6x18 waterproof binocular that I gave him when he flies single engined aircraft.
He finds it most useful and the canopy glass...
Forum: Spotting Scopes & tripod/heads Saturday 5th January 2019, 16:49
Replies: 21
Views: 821
Posted By Binastro
When I have the energy I'll list the factors that...

When I have the energy I'll list the factors that I have found regarding image quality.

Opening a window during the daytime for scope observations maybe O.K. when the temperature inside and outside...
Forum: Spotting Scopes & tripod/heads Friday 4th January 2019, 22:03
Replies: 21
Views: 821
Posted By Binastro
Hi Richard, My kitchen double glazing is fine at...

Hi Richard,

My kitchen double glazing is fine at 120x with a good 100mm scope, O.K. at 190x also, viewing birds on chimney pots at 124 metres. At a horizontal angle of 30 degrees. At least...
Forum: Binoculars Friday 4th January 2019, 16:55
Replies: 37
Views: 2,034
Posted By Binastro
I thought that maybe Gijs mentioned Balzers of...

I thought that maybe Gijs mentioned Balzers of Liechtenstein multicoating Porroprism binoculars much earlier than 1978.
They did this for a binocular maker, who sent them the optical components.

The...
Forum: Binoculars Friday 4th January 2019, 15:27
Replies: 37
Views: 2,034
Posted By Binastro
I can't remember exact dates but Minolta...

I can't remember exact dates but Minolta achromatic coatings from about 1965 were two layer coating, used on their lenses.

Taylor Taylor Hobson patented a 3 layer coating with tunable middle coat...
Showing results 1 to 25 of 1000
 


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