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Search: Posts Made By: Binastro
Forum: Spotting Scopes & tripod/heads Yesterday, 20:07
Replies: 20
Views: 529
Posted By Binastro
Probably best to find a plastic cover from a...

Probably best to find a plastic cover from a household bottle or maybe the caps from an astro eyepiece.
The front caps are usually 31.7mm or a bit larger, the rear varies.

Or possibly the cap from...
Forum: Zeiss Yesterday, 15:02
Replies: 6
Views: 195
Posted By Binastro
Thanks Henry.

Thanks Henry.
Forum: Zeiss Yesterday, 10:08
Replies: 6
Views: 195
Posted By Binastro
With top quality binoculars centrally placed...

With top quality binoculars centrally placed stars are usually round if ones eyes have no astigmatism.

With binoculars that have poorly made optics central stars are small lines or ellipses....
Forum: Binoculars Thursday 18th October 2018, 14:51
Replies: 6
Views: 247
Posted By Binastro
The Helios Stellar II 10.5x70 binocular weighs...

The Helios Stellar II 10.5x70 binocular weighs 1,750g and has a 4.8 degree field.
The Helios Apollo 10.5x70 weighs 2,500g and has a field of 5.0 degrees.

Both AFOVs are pretty miserable for...
Forum: Binoculars Thursday 18th October 2018, 14:09
Replies: 6
Views: 247
Posted By Binastro
Hi Coin Hound. It depends on how dark your...

Hi Coin Hound.

It depends on how dark your observing site is and whether your pupils open to almost 7mm.
I have no trouble at all hand holding 12x50 or 12x45 binoculars for astronomy and when...
Forum: Binoculars Wednesday 17th October 2018, 15:04
Replies: 16
Views: 680
Posted By Binastro
Usually IS binoculars have small exit...

Usually IS binoculars have small exit pupils.

With the electronic stabilised IS monoculars there is a limit of about 25mm to 30mm aperture.
With other systems there are binoculars and monoculars up...
Forum: Spotting Scopes & tripod/heads Wednesday 17th October 2018, 14:44
Replies: 20
Views: 529
Posted By Binastro
Don't believe what is written on the box. Post...

Don't believe what is written on the box. Post 17.

I took the precaution of weighing the Russian scope.
Because the discrepancy was so great, I got the calibrated weights and calibrated the...
Forum: Spotting Scopes & tripod/heads Tuesday 16th October 2018, 20:33
Replies: 20
Views: 529
Posted By Binastro
Re. post 17. The cyrillic letters on the large...

Re. post 17.

The cyrillic letters on the large label on the top of the inner box have me beaten.
I need someone to read it for me.

The external width at the lens hood front is 60.5mm. Perhaps the...
Forum: Spotting Scopes & tripod/heads Tuesday 16th October 2018, 18:36
Replies: 20
Views: 529
Posted By Binastro
Helios Telescope imported by TOE Telescope and...

Helios Telescope imported by TOE Telescope and Optical equipment.
HELIOS 20xTELESCOPE.
Dioptre adjustment -7 to +15
FOV 2 degrees
35.6 at 1000m
Weight 550gm
Length 385 to 540mm.
Width 39mm.

Diagram.
Forum: Binoculars Tuesday 16th October 2018, 14:38
Replies: 16
Views: 680
Posted By Binastro
Hi Roy, It may be that the frequency of your hand...

Hi Roy,
It may be that the frequency of your hand movement is not perfectly suited to the IS set up of an individual binocular.
So one needs to try a binocular and buy the one tested if suitable.

A...
Forum: Binoculars Monday 15th October 2018, 19:48
Replies: 16
Views: 680
Posted By Binastro
If one uses glasses then one would have to see if...

If one uses glasses then one would have to see if the Canon IS has enough eye relief.
Also maybe only 3 dioptres adjustment.

My Canon 10x30 IS Mk 2 probably has the best IS of any of the IS that I...
Forum: Swarovski Monday 15th October 2018, 19:36
Replies: 2
Views: 342
Posted By Binastro
I don't know, but the special forces shown using...

I don't know, but the special forces shown using Swarovski binoculars and spotting scopes were probably not.
I don't know who made the night vision equipment.
Forum: Spotting Scopes & tripod/heads Monday 15th October 2018, 19:29
Replies: 20
Views: 529
Posted By Binastro
As to a low priced scope for viewing at 1000...

As to a low priced scope for viewing at 1000 metres.

I would think that the Fieldmaster A90 30x-90x90 refractor spotting scope at 129 must be good value.
It probably has a lot of false colour.
It...
Forum: Binoculars Monday 15th October 2018, 14:40
Replies: 19
Views: 562
Posted By Binastro
Lee, To clarify. When handed a Canon 18x50 IS...

Lee,
To clarify.
When handed a Canon 18x50 IS binocular in the dark, it is very difficult, even for a very experienced observer, to adjust the IPD if one doesn't know how it works.
The rear end is...
Forum: Binoculars Monday 15th October 2018, 12:20
Replies: 19
Views: 562
Posted By Binastro
What about lending or gifting the mother in law?...

What about lending or gifting the mother in law? (:
Forum: Binoculars Monday 15th October 2018, 12:14
Replies: 41
Views: 1,387
Posted By Binastro
The Leica Duovid is not strictly a zoom binocular.

The Leica Duovid is not strictly a zoom binocular.
Forum: Others Monday 15th October 2018, 12:07
Replies: 24
Views: 785
Posted By Binastro
Hi John, post 11. Could you please explain...

Hi John, post 11.

Could you please explain further, perhaps with a diagram, why the depth of field increases inversely with the square of the magnification.
Also, why is the area of the circles of...
Forum: Binoculars Sunday 14th October 2018, 16:30
Replies: 19
Views: 562
Posted By Binastro
Lee, No, actual experience. Because they are...

Lee,
No, actual experience.

Because they are used to getting the best out of their often not great telescopes, astronomers seem to understand optics and their eyes.

But others when being handed...
Forum: Spotting Scopes & tripod/heads Sunday 14th October 2018, 15:57
Replies: 20
Views: 529
Posted By Binastro
Yes, that is the small scope I tested above. I...

Yes, that is the small scope I tested above.
I probably got the 32mm and 40mm zoom scopes twenty or thirty years ago and haven't found the 40mm yet.
I presume that you want to buy one of the USSR...
Forum: Binoculars Sunday 14th October 2018, 15:30
Replies: 19
Views: 562
Posted By Binastro
Astronomers usually know how to use binoculars,...

Astronomers usually know how to use binoculars, as they ask how to adjust IPD etc.

Others usually don't.
Forum: Others Sunday 14th October 2018, 15:21
Replies: 24
Views: 785
Posted By Binastro
If one sets left and right sides to different...

If one sets left and right sides to different focus distances, one can indeed increase the depth of field.

One also increases the depth of headaches with prolonged viewing.
Forum: Swarovski Saturday 13th October 2018, 18:20
Replies: 2
Views: 342
Posted By Binastro
Mediterranean with Simon Reeve

BBC 2 iPlayer.

First of 4 parts.

Simon Reeve uses Swarovski binoculars.

Just before half way in the hour's programme, others are using Swarovski binoculars and spotting scopes. Also various night...
Forum: Binoculars Saturday 13th October 2018, 16:15
Replies: 41
Views: 1,387
Posted By Binastro
The Russians claim that their mechanical IS is...

The Russians claim that their mechanical IS is very tough, long lived and reliable.
I.e. 20x50 Stabilised.

The older 16x50, that supposedly worked as a 16x35 was, I think, used primarily in...
Forum: Binoculars Saturday 13th October 2018, 16:03
Replies: 12
Views: 753
Posted By Binastro
Of all the commonly available binocular sizes up...

Of all the commonly available binocular sizes up to 60mm aperture, 42 is the prettiest in binary.
101010.
The robots that control us know this (:

21 is slightly pretty.
10101.

As is 32.
100000.
Forum: Spotting Scopes & tripod/heads Friday 12th October 2018, 16:25
Replies: 20
Views: 529
Posted By Binastro
Just tried the Turist P? cyrillic...

Just tried the Turist P? cyrillic markings.
8x-20x x32.
Made in USSR.

All Black. As new including paper wrapper.

At 120m distance the resolution is very good at all magnifications.
The focus...
Showing results 1 to 25 of 1000
 


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