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Search: Posts Made By: Binastro
Forum: Binoculars Today, 11:38
Replies: 27
Views: 771
Posted By Binastro
Hi Lee. I think it is that stars are very high...

Hi Lee.
I think it is that stars are very high contrast point sources basically.

The aircraft are in focus, but I think it is just that at f/2.8 the lens performance is just poor.
Also the G15...
Forum: Binoculars Today, 11:12
Replies: 10
Views: 96
Posted By Binastro
Hi all, Well done. Here it was mainly cloudy in...

Hi all,
Well done.

Here it was mainly cloudy in the early hours, and I didn't see much, although I have seen numerous lunar eclipses.
One was so dark that the Moon was almost invisible.
It depends...
Forum: Binoculars Yesterday, 22:50
Replies: 39
Views: 1,414
Posted By Binastro
Hi Lars, Post 28. Have you heard the one 'Alpaca...

Hi Lars,
Post 28.

Have you heard the one 'Alpaca walks into opticians shop'?

I just saw this on the BBC that claimed it spent half an hour perusing the lenses.

Off topic I know, but maybe it...
Forum: Binoculars Yesterday, 16:31
Replies: 27
Views: 771
Posted By Binastro
Lee, You are correct in a way. But both lenses...

Lee,
You are correct in a way.
But both lenses are in fact wide open at the tele lens setting, not stopped down.

Both cameras have superb very fast autofocus in the daytime, and are working at...
Forum: Binoculars Yesterday, 15:57
Replies: 27
Views: 771
Posted By Binastro
With regard to eye relief, not only is there...

With regard to eye relief, not only is there reduced depth of field, but the eye performance is worse in poorer light, both because of a faster f ratio and 'sensor' and processor (brain, eye).

One,...
Forum: Binoculars Wednesday 16th January 2019, 15:40
Replies: 27
Views: 771
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: 27
Views: 771
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: 41
Views: 1,349
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: 627
Posted By Binastro
Konus, not sure about that. B.

Konus, not sure about that.

B.
Forum: Binoculars Monday 14th January 2019, 17:30
Replies: 41
Views: 1,349
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: 2,124
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: 913
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: 1,020
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: 1,020
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: 329
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: 270
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: 233
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: 2,057
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: 13
Views: 361
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: 13
Views: 361
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: 444
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: 2,057
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: 833
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: 833
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: 488
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...
Showing results 1 to 25 of 1000
 


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