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Search: Posts Made By: Binastro
Forum: Binoculars Tuesday 14th January 2020, 21:02
Replies: 7
Views: 228
Posted By Binastro
Welcome H, If it was a genuine Optolyth it might...

Welcome H,

If it was a genuine Optolyth it might say Ceralin coatings in German.

The plastic strap looks perhaps Japanese, or other Asian maker.

Is there a case for it?

The Nr. mark may not mean...
Forum: Binoculars Tuesday 14th January 2020, 15:37
Replies: 157
Views: 4,505
Posted By Binastro
The image of the chimney pot at 124m in bright...

The image of the chimney pot at 124m in bright morning sunshine using a hand held 25x70 Skymaster was bright and large, but not too bright.
However, it quickly became silly because of the...
Forum: Swarovski Monday 13th January 2020, 16:55
Replies: 13
Views: 631
Posted By Binastro
Thanks for that MandoBear. Even top companies...

Thanks for that MandoBear.

Even top companies don't always get it right.

With servicing it basically comes down to the skill of the individual technician doing the job, and time...
Forum: Binoculars Saturday 11th January 2020, 17:07
Replies: 9
Views: 349
Posted By Binastro
What is not included here is the distance between...

What is not included here is the distance between the glasses and the eye.
If this distance is varied, either by the spectacle frame or facial figure then the magnification changes.

In fact, I get...
Forum: Binoculars Thursday 9th January 2020, 20:30
Replies: 157
Views: 4,505
Posted By Binastro
I thought you are talking about binocular...

I thought you are talking about binocular movement.

If the binocular amplitude due to hand movement or shake is 120 arcseconds then it is 120 arcseconds for any magnification.
With the same...
Forum: Binoculars Thursday 9th January 2020, 20:08
Replies: 3
Views: 381
Posted By Binastro
Thanks. In the main full agreement. Regards, B.

Thanks.

In the main full agreement.

Regards,
B.
Forum: Binoculars Thursday 9th January 2020, 19:45
Replies: 157
Views: 4,505
Posted By Binastro
Hi Peter, With the Canon 18x50 IS I gain 1.5...

Hi Peter,

With the Canon 18x50 IS I gain 1.5 magnitudes on faintest stars when the IS is switched on, compared with switched off.
That is 4 times fainter.
The faint stars are tiny.

The same with...
Forum: Binoculars Thursday 9th January 2020, 13:47
Replies: 157
Views: 4,505
Posted By Binastro
In the above tests in bright sunshine the 8.5x44...

In the above tests in bright sunshine the 8.5x44 binocular was probably acting as an 8.5x22 binocular.
The 25x70 as a 25x63 or 24x60.
The 15x70 as a 15x38.

The coarse detail was better seen in the...
Forum: Binoculars Thursday 9th January 2020, 11:34
Replies: 157
Views: 4,505
Posted By Binastro
Test 2. Thought this was the 25x-135x80, but...

Test 2.

Thought this was the 25x-135x80, but unboxing it is the as new Helios 15x70 Waterproof long eye relief binocular.
I think this is the Quantam under a Helios name.

This 15x70 is high quality...
Forum: Binoculars Thursday 9th January 2020, 11:13
Replies: 157
Views: 4,505
Posted By Binastro
Test 1. 10.45 a.m. 25x70 Skywatcher. Chinmey...

Test 1.

10.45 a.m.

25x70 Skywatcher.
Chinmey pot 124m distance.
Bright sunshine.
Eyecups folded down to minimum.

Initially very unpleasant holding body with two hands.
Forum: Binoculars Thursday 9th January 2020, 09:31
Replies: 157
Views: 4,505
Posted By Binastro
Post 71. The 120 arcsecond movement at 10x will...

Post 71.

The 120 arcsecond movement at 10x will still be 120 arcseconds at 100x, not 1200 arcseconds.

The crab nebula pulsar has a pulse time of 30 per second.
A decade before it was discovered a...
Forum: Binoculars Wednesday 8th January 2020, 16:26
Replies: 157
Views: 4,505
Posted By Binastro
Familiarity with the target helps with glimpsed...

Familiarity with the target helps with glimpsed views.

We have persistence of vision, even without a photographic memory.

My understanding is that photographic memory needs more than a fraction of...
Forum: Leica Wednesday 8th January 2020, 15:50
Replies: 12
Views: 698
Posted By Binastro
The Fujinon 14x40 had an almost totally white...

The Fujinon 14x40 had an almost totally white covering. Maybe worse from heavy sea use.

The Minolta AF 5000 and AF 7000 Cameras, the first production autofocus SLRS seem to all be covered in white...
Forum: Zeiss Tuesday 7th January 2020, 16:29
Replies: 20
Views: 948
Posted By Binastro
Canon 10x42L IS maybe, for looking across a...

Canon 10x42L IS maybe, for looking across a canyon instead of a scope.

B.
Forum: Leica Tuesday 7th January 2020, 16:10
Replies: 254
Views: 11,798
Posted By Binastro
Not only are curves and spacings sometimes...

Not only are curves and spacings sometimes deliberately wrong, but glass types are sometimes specified at the extreme of tolerance, so that those who copy while paying no licence fee and infringing...
Forum: Binoculars Monday 6th January 2020, 15:19
Replies: 157
Views: 4,505
Posted By Binastro
Pileatus, Nice mount and counterweight. I...

Pileatus,

Nice mount and counterweight.

I suppose the controller is to bring the binocular to the eyes. (:

Regards,
B.
Forum: Binoculars Monday 6th January 2020, 13:08
Replies: 157
Views: 4,505
Posted By Binastro
I just counted up as many 15x and higher...

I just counted up as many 15x and higher magnification binoculars that I have actually used for either terrestrial or astro observations.
These are all different types not duplicates.
I am currently...
Forum: Binoculars Sunday 5th January 2020, 23:34
Replies: 157
Views: 4,505
Posted By Binastro
Gijs, post 35. I am with you here. 3 times...

Gijs,

post 35.

I am with you here.

3 times larger, 25 times compared to 8 times.
Yes it is.

3 times more detail than 8x.
Forum: Binoculars Sunday 5th January 2020, 15:20
Replies: 157
Views: 4,505
Posted By Binastro
I will give personal thoughts here. I cannot see...

I will give personal thoughts here.

I cannot see through other people's eyes, only my own eyes.

In general, I think that the oscillations from hand holding a binocular are a rough circle with...
Forum: Binoculars Saturday 4th January 2020, 20:36
Replies: 157
Views: 4,505
Posted By Binastro
I was using the Canon 10x42L IS yesterday, and in...

I was using the Canon 10x42L IS yesterday, and in connection to the best of the best thread, I would say that this is it.
However, it is heavy and bulky, so maybe only the best of the best for the...
Forum: Leica Friday 3rd January 2020, 14:51
Replies: 254
Views: 11,798
Posted By Binastro
Oskar Barnack did not invent or create the...

Oskar Barnack did not invent or create the 24x36mm frame size, nor the first camera to use it.

The American Simplex still camera was in production in 1914 and used the 24x36mm frame size using 35mm...
Forum: Binoculars Friday 3rd January 2020, 13:56
Replies: 157
Views: 4,505
Posted By Binastro
A very short sighted or far sighted person won't...

A very short sighted or far sighted person won't see much without glasses.

Wearing glasses alters the magnification.

Wearing glasses using a binocular alters the marked magnification of the...
Forum: Leica Friday 3rd January 2020, 13:30
Replies: 254
Views: 11,798
Posted By Binastro
In my opinion a loose hinge is a major defect,...

In my opinion a loose hinge is a major defect, and one does not tighten Leica hinges at home within warranty.

In another post claiming Leica has made all their own lenses.

Leica lenses were made by...
Forum: Binoculars Friday 3rd January 2020, 13:03
Replies: 157
Views: 4,505
Posted By Binastro
Since about 1960 the classic focal lengths of...

Since about 1960 the classic focal lengths of astro telescope eyepieces has been.

4mm, 6mm, 9mm, 12mm, 18mm, 25mm and 40mm.

This suggests to me that the step for providing increasing magnification...
Forum: Binoculars Thursday 2nd January 2020, 15:18
Replies: 157
Views: 4,505
Posted By Binastro
I wasn't going to comment, but I'll give...

I wasn't going to comment, but I'll give practical thoughts.

Firstly naked eye vision is not always 1x.
If people wear glasses it is perhaps between 0.85x and 1.18x. An eye specialist might...
Showing results 1 to 25 of 1000
 


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