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Search: Posts Made By: Binastro
Forum: Binoculars Yesterday, 18:20
Replies: 15
Views: 272
Posted By Binastro
Hi and welcome. The depth of field is the same...

Hi and welcome.

The depth of field is the same for all the 8x binoculars.
I suppose a curved field could be interpreted as extra depth of field.

Avoid the word hunting here.

Others will advise on...
Forum: Binoculars Yesterday, 17:43
Replies: 20
Views: 437
Posted By Binastro
Zeiss found long ago that some of their doublets...

Zeiss found long ago that some of their doublets for photo lenses were so exactly made that the two elements stuck together and could not be easily separated. This is I suppose cold welding. They did...
Forum: Leica Yesterday, 16:41
Replies: 51
Views: 1,844
Posted By Binastro
Not only that. I would have bought a 6x24 new...

Not only that.

I would have bought a 6x24 new Trinovid with 212m field whatever the optical system.

Possibly also a 10x40 with the 7.0 degree eyepieces or, if it suited my eyes, a 10x40 with 8.0...
Forum: Binoculars Saturday 16th November 2019, 22:20
Replies: 56
Views: 2,765
Posted By Binastro
Hi cdm, Not an exact answer, but it depends...

Hi cdm,

Not an exact answer, but it depends firstly on an individual's IPD.

A binocular may seem in good alignment to one person, but may be a bit off for somebody else.

One way is to see if there...
Forum: Binoculars Saturday 16th November 2019, 20:44
Replies: 56
Views: 2,765
Posted By Binastro
I think out of alignment and out of collimation...

I think out of alignment and out of collimation is more accurate.

Like quite a few of my binoculars, which I have no intention of correcting or getting corrected, at this late stage.

One thing I am...
Forum: Spotting Scopes & tripod/heads Saturday 16th November 2019, 16:10
Replies: 3
Views: 138
Posted By Binastro
It may be that the lifetime warranty is more...

It may be that the lifetime warranty is more important than the difference in optical performance.

I have not tried either scope, but suppose both are adequate.

There will be sample variation,...
Forum: Spotting Scopes & tripod/heads Friday 15th November 2019, 20:49
Replies: 3
Views: 138
Posted By Binastro
Vortex may have longer warranty. B.

Vortex may have longer warranty.

B.
Forum: Zeiss Thursday 14th November 2019, 10:45
Replies: 5
Views: 268
Posted By Binastro
Thanks John. Two of those sites I also turned...

Thanks John.

Two of those sites I also turned up.

The Fraunhofer comments came up as I was searching for early antireflection coatings.
It was a translation from German of Fraunhofer's own...
Forum: Binoculars Wednesday 13th November 2019, 22:56
Replies: 6
Views: 211
Posted By Binastro
Hi Mark, I have two Nikon Action 10-22x50...

Hi Mark,

I have two Nikon Action 10-22x50 binoculars.
These are similar to the Aculon zoom.
They are not that bad, but are not the choice for birdwatching.

Firstly, at low powers the field is...
Forum: Zeiss Wednesday 13th November 2019, 19:33
Replies: 5
Views: 268
Posted By Binastro
I have just seen a note that Joseph Fraunhofer...

I have just seen a note that Joseph Fraunhofer first noted antireflection coating in 1817 after using sulphuric acid on glass.

It maybe that Dennis Taylor's reference in 1891, in his work on testing...
Forum: Zeiss Wednesday 13th November 2019, 18:58
Replies: 5
Views: 268
Posted By Binastro
Sorry Canip, I don't know how to do pictures, but...

Sorry Canip,
I don't know how to do pictures, but there are photos of the same model easily found on the internet.

The reason it was put away is that it needs overhaul as it doesn't focus correctly...
Forum: Zeiss Wednesday 13th November 2019, 15:21
Replies: 5
Views: 268
Posted By Binastro
Carl Zeiss Jena reverse Porroprism Binocular.

Just found this tucked away in a drawer.

Possibly 6x15 Teletur, but markings are very faint. 1910 to 1924?
I think that someone has painted over the metal parts in black.

Objectives about 14mm...
Forum: Binoculars Monday 11th November 2019, 21:48
Replies: 21
Views: 766
Posted By Binastro
Thanks Kevin, I tried to see the Mercury transit...

Thanks Kevin,

I tried to see the Mercury transit today with a filtered Canon 10x30IS Mk II, but cloud won and I didn't see it.
Others saw it with filtered binoculars.

Regards,
B.
Forum: Leica Monday 11th November 2019, 11:26
Replies: 69
Views: 2,949
Posted By Binastro
No backlash from me, despite my being a self...

No backlash from me, despite my being a self confessed polluter.

Unless we bring our aspirations way down and stop making billions, if not trillions of LEDS etc. humans are lost.
But the truth is...
Forum: Binoculars Monday 11th November 2019, 11:17
Replies: 21
Views: 766
Posted By Binastro
Gijs and Lee. That is good to know. Regards, B.

Gijs and Lee.

That is good to know.

Regards,
B.
Forum: Leica Saturday 9th November 2019, 17:50
Replies: 69
Views: 2,949
Posted By Binastro
My small secondhand Canon SX730 camera already...

My small secondhand Canon SX730 camera already easily outresolves my Canon 18x50IS.

Probably the future binoculars will just be linked into our brains.

But what use are humans when robots rule the...
Forum: Binoculars Saturday 9th November 2019, 16:37
Replies: 7
Views: 564
Posted By Binastro
Hi publin, The 8x30 binocular shown is indeed...

Hi publin,

The 8x30 binocular shown is indeed basically not plastic.
It is also not a zoom binocular.

It looks like a low priced 8x30 Porroprism binocular that could be made anywhere.
The German...
Forum: Binoculars Friday 8th November 2019, 19:24
Replies: 4
Views: 313
Posted By Binastro
Probably Chinese. B.

Probably Chinese.

B.
Forum: Binoculars Friday 8th November 2019, 19:23
Replies: 7
Views: 564
Posted By Binastro
Some SIB binoculars are Russian. If the 8x30 SIB...

Some SIB binoculars are Russian.

If the 8x30 SIB says 175m at 1000m on the right top plate then it is untrue.
Probably not German.

Low value, I think.

B.
Forum: Binoculars Thursday 7th November 2019, 22:19
Replies: 28
Views: 716
Posted By Binastro
Weird, the gremlins posted it twice. B.

Weird, the gremlins posted it twice.

B.
Forum: Binoculars Thursday 7th November 2019, 22:19
Replies: 28
Views: 716
Posted By Binastro
Andy, I have absolutely no problem keeping the...

Andy,
I have absolutely no problem keeping the Docter 10x25 steady and properly placed for my eyes.
It is in my pocket, no case. I open it and it stays in place with no problems.

I do have problems...
Forum: Binoculars Thursday 7th November 2019, 21:26
Replies: 28
Views: 716
Posted By Binastro
publin, The Soviet binoculars are usually easy...

publin,

The Soviet binoculars are usually easy to date as the two first numbers of the serial number is the date.
New, they actually have the date of final manufacture and the final testers...
Forum: Binoculars Thursday 7th November 2019, 16:32
Replies: 28
Views: 716
Posted By Binastro
I just saw a gold coloured Ferrari. I almost...

I just saw a gold coloured Ferrari.
I almost burst out laughing as I took a photo.
The two people approaching were also giggling.

I don't think it was gold plated, although it looked like it...
Forum: Binoculars Thursday 7th November 2019, 11:28
Replies: 28
Views: 716
Posted By Binastro
Hi publin, Even the 2,000 binoculars of the top...

Hi publin,

Even the 2,000 binoculars of the top names are not perfect.
But they can be very good.
Birdwatchers choose these if they can.

People who smoke or drink waste 2,000 in perhaps a couple...
Forum: Binoculars Thursday 7th November 2019, 11:13
Replies: 21
Views: 766
Posted By Binastro
Hi Chosun, Unfortunately some of these dark sky...

Hi Chosun,

Unfortunately some of these dark sky parks, although very dark, still have distant light glow.

Hopefully, in this Australian reserve, there really are no visible light glows in the...
Showing results 1 to 25 of 1000
 


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