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Search: Posts Made By: Binastro
Forum: Others Yesterday, 21:57
Replies: 12
Views: 325
Posted By Binastro
Thanks Kimmo, Yes the jitters I see are I think...

Thanks Kimmo,

Yes the jitters I see are I think the same as you describe, but possibly a bit worse than if I tried a new example.
They may possibly not be noticed on a moving boat or by a helicopter...
Forum: Zeiss Yesterday, 18:57
Replies: 16
Views: 397
Posted By Binastro
Although there are a few master opticians, I am...

Although there are a few master opticians, I am not sure if any of them have the depth of experience and abilities of say James Baker in the U.S. or Horace Dall in the U.K.

Certainly the current...
Forum: Zeiss Yesterday, 15:34
Replies: 16
Views: 397
Posted By Binastro
It was very surprising to me to see that lenses...

It was very surprising to me to see that lenses in the million dollar range were made in France by firms that I didn't know made hand aspheric large optics or any optics at all.

In the U.S. some of...
Forum: Others Yesterday, 15:03
Replies: 12
Views: 325
Posted By Binastro
Although the specs say the IPD range is 60-70mm,...

Although the specs say the IPD range is 60-70mm, the measured range is 56mm to 73mm on this example.

I put in some fresh 20 year lithium AAs, expire December 2035.
Hmm!

They are lighter than the...
Forum: Others Friday 20th April 2018, 14:10
Replies: 12
Views: 325
Posted By Binastro
Yesterday the Fujinon didn't take long to warm...

Yesterday the Fujinon didn't take long to warm up, it was 28C.

Even when cooler it only takes perhaps 3 seconds, so no problem for me.

I am not sure if it eventually shuts down, but a red light...
Forum: Others Wednesday 18th April 2018, 14:03
Replies: 12
Views: 325
Posted By Binastro
Saw Jupiter was bright although low, no cloud,...

Saw Jupiter was bright although low, no cloud, but transparency only fair. Severe light pollution.

00.25 to 00.29 BST this morning.
Elevation 17 degrees.
Jupiter near maximum size and brightness....
Forum: Others Tuesday 17th April 2018, 21:20
Replies: 12
Views: 325
Posted By Binastro
First test of Fujinon at night near...

First test of Fujinon at night near streetlight.
Flare and ghosting control is very good, but the Canon 18x50 IS may be better.

I will try further tests.

One strange thing is that when the Fujinon...
Forum: Others Tuesday 17th April 2018, 17:43
Replies: 12
Views: 325
Posted By Binastro
The Fujinon seems to have offset roof prisms and...

The Fujinon seems to have offset roof prisms and no tripod socket.

The Canon Porroprisms and a tripod socket on the bottom.

The Canon is 50mm aperture, the Fujinon 40mm. A big difference.
Forum: Others Tuesday 17th April 2018, 16:55
Replies: 12
Views: 325
Posted By Binastro
The Fujinon has a very nice clean bright image in...

The Fujinon has a very nice clean bright image in good light.
The Canon 18x50 IS has more CA particularly near the edges of a much wider AFOV. It is also bright in good light.
The Canon also displays...
Forum: Others Tuesday 17th April 2018, 13:50
Replies: 12
Views: 325
Posted By Binastro
With the side strap removed and without the...

With the side strap removed and without the neckstrap the Fujinon weighs 1278g including 4 AAs.

The Canon 18x50 IS with 2 AAs weighs 1195g.

The Fujinon has a rain guard for the eyepieces but no...
Forum: Others Tuesday 17th April 2018, 11:43
Replies: 12
Views: 325
Posted By Binastro
Fujinon Techno-Stabi 14x40

The Beast from the East (Kamakura?).

This ancient mariner thought that the weight would be just too much, but the binocular is not that bad, although heavy.

The binocular is used, maybe well...
Forum: Minox Monday 16th April 2018, 18:28
Replies: 6
Views: 202
Posted By Binastro
Lee, Only if it was a fairly thick curry (: The...

Lee,
Only if it was a fairly thick curry (:

The problem with very accurate digital devices is how to set them.

It is possible a bench mark for Ordinance Survey is accurate to a foot above sea...
Forum: Minox Monday 16th April 2018, 13:13
Replies: 6
Views: 202
Posted By Binastro
I have some small Minox altimeter binoculars,...

I have some small Minox altimeter binoculars, maybe 8x24 where the altimeter is accurate to 2 or 3ft.
On the table one sees one height, lift it up and a different height.
I was fascinated how...
Forum: Tripod and Heads Sunday 15th April 2018, 18:13
Replies: 9
Views: 262
Posted By Binastro
Astronomers turn the pan handle backwards, if...

Astronomers turn the pan handle backwards, if there isn't a shorter one.
I.e. rotate 180 degrees.
Forum: Swift Wednesday 11th April 2018, 14:36
Replies: 14
Views: 496
Posted By Binastro
Which version?

Which version?
Forum: Binoculars Tuesday 10th April 2018, 15:27
Replies: 48
Views: 1,514
Posted By Binastro
Gijs, Does the 6x30 Libra have only the two outer...

Gijs,
Does the 6x30 Libra have only the two outer surfaces single coated?

I would be interested to know the transmission.

Is the field about 11 degrees?

If I was able to buy them at 20 euros I...
Forum: Binoculars Monday 9th April 2018, 21:34
Replies: 48
Views: 1,514
Posted By Binastro
Like numerous Chinese binoculars, the fault is...

Like numerous Chinese binoculars, the fault is cheapness, brought about by customers who want something for nothing, or are only prepared to pay the cheapest price possible.

So what happens.
There...
Forum: Binoculars Monday 9th April 2018, 15:08
Replies: 48
Views: 1,514
Posted By Binastro
Libra is a constellation. Also weighing...

Libra is a constellation.
Also weighing scales.
And maybe justice?

Also the forerunner of the pound.
Forum: Binoculars Monday 9th April 2018, 15:04
Replies: 48
Views: 1,514
Posted By Binastro
The 6x30 Libra is ridiculously cheap if well...

The 6x30 Libra is ridiculously cheap if well collimated and a good sample, but the 4x22 makes more sense.

Looking again it seems that the 6x30 is indeed a longer barrel version of the 4x22.

If the...
Forum: Binoculars Monday 9th April 2018, 14:58
Replies: 48
Views: 1,514
Posted By Binastro
Re. post 40. The 4x22 may have only 2 blue...

Re. post 40.

The 4x22 may have only 2 blue coated surfaces, all the others uncoated. A pity, but that is how it is.
The box is marked 4x22WA
Greatest FOV 300M/1000M (17*)
Bak4 prism
Coated optics
CN...
Forum: Binoculars Monday 9th April 2018, 14:41
Replies: 48
Views: 1,514
Posted By Binastro
Hi Gijs, The Libra 6x30 may be the same as the...

Hi Gijs,
The Libra 6x30 may be the same as the Dowling and Rowe 4x22 but with longer objective barrels.
I paid more than double the 6x30 price for the 4x22, but I use it whenever I need a very wide...
Forum: Zeiss Sunday 8th April 2018, 21:35
Replies: 16
Views: 632
Posted By Binastro
The size and intensity of the solar reflections...

The size and intensity of the solar reflections depend on whether the glass surfaces, probably the rear eye lens surface is flat or curved.
There could possibly be reflections from more than one...
Forum: Binoculars Friday 6th April 2018, 14:50
Replies: 3
Views: 334
Posted By Binastro
The gauges are made in India. The 13.0mm hole...

The gauges are made in India.

The 13.0mm hole measures 13.00mm.
The 12.5mm hole measures 12.50mm.

Vernier calipers reading to 0.02mm.

So I think that the holes are accurate sizes for exit pupils...
Forum: Binoculars Friday 6th April 2018, 12:33
Replies: 3
Views: 334
Posted By Binastro
Duratool D03115 Stainless Steel 25 hole metric...

Duratool D03115 Stainless Steel 25 hole metric drill gauge 1 - 13mm.

Also Imperial version.

Well known site. ~5.59 including postage.
Forum: Binoculars Thursday 5th April 2018, 18:24
Replies: 14
Views: 464
Posted By Binastro
You would only get veiling glare or ghosting if...

You would only get veiling glare or ghosting if the 7x36 is used near street lighting or house lighting. Also from car headlights.

If used away from direct lighting the view should be good, although...
Showing results 1 to 25 of 1000
 

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