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Search: Posts Made By: Binastro
Forum: Spotting Scopes & tripod/heads Yesterday, 16:50
Replies: 12
Views: 499
Posted By Binastro
In practice if both telescopes are high quality,...

In practice if both telescopes are high quality, the Skywatcher 150ED refractor and Celestron 9.25 SCT would have similar resolution.
The brightness of the image in the Celestron 9.25 would be about...
Forum: Binoculars Thursday 21st February 2019, 22:25
Replies: 6
Views: 499
Posted By Binastro
Yes it is. B.

Yes it is.

B.
Forum: Nikon Thursday 21st February 2019, 10:10
Replies: 3
Views: 262
Posted By Binastro
In the nuclear industry there are thick windows...

In the nuclear industry there are thick windows where remote viewing is necessary.
The windows become brown and have to be exposed to strong ultraviolet to reverse the process.
If I saw this...
Forum: Spotting Scopes & tripod/heads Thursday 21st February 2019, 09:28
Replies: 12
Views: 499
Posted By Binastro
Hi Lars, Is the idea of a 100mm spotting scope...

Hi Lars,
Is the idea of a 100mm spotting scope based on the possibility of a dual purpose instrument?
To be used on the balcony and also in the field.
In my opinion this is a compromise and does not...
Forum: Spotting Scopes & tripod/heads Wednesday 20th February 2019, 21:53
Replies: 12
Views: 499
Posted By Binastro
Hi Lars, The scope my friend had was a Criterion...

Hi Lars,
The scope my friend had was a Criterion Dynamax 8 inch SCT and gave splendid daytime views from his south facing balcony, despite poor general reviews.
1970s.

The distance to the island was...
Forum: Opticron Wednesday 20th February 2019, 15:43
Replies: 5
Views: 171
Posted By Binastro
Possibly swung on a tripod onto a solid object.

Possibly swung on a tripod onto a solid object.
Forum: Spotting Scopes & tripod/heads Tuesday 19th February 2019, 17:49
Replies: 12
Views: 499
Posted By Binastro
Hi Lars, In Sweden there may be double or triple...

Hi Lars,
In Sweden there may be double or triple glazing.
If the balcony window glass can be arranged to leave a single glass element it would be best for through the glass viewing.
Even with double...
Forum: Spotting Scopes & tripod/heads Tuesday 19th February 2019, 17:12
Replies: 12
Views: 499
Posted By Binastro
Lars, The answer is yes if carefully planned. The...

Lars,
The answer is yes if carefully planned.
The problem with viewing south is the Sun. However, if the angle between you and the Sun is large it would be good.

My Skywatcher 90mm Maksutov can...
Forum: Binoculars Tuesday 19th February 2019, 16:14
Replies: 6
Views: 499
Posted By Binastro
I can fit the Visionking 5x25 in my anorak...

I can fit the Visionking 5x25 in my anorak pocket.
FOV ~15 degrees.
AFOV~75 degrees simple.

There was an Olympus 10x25 reversed Porroprism binocular with a 7 degree FOV.
AFOV~70 degrees...
Forum: Swarovski Monday 18th February 2019, 10:42
Replies: 7
Views: 320
Posted By Binastro
Thank you Gijs and John. Regards, B.

Thank you Gijs and John.

Regards,
B.
Forum: Swarovski Monday 18th February 2019, 09:11
Replies: 7
Views: 320
Posted By Binastro
Thank you John, Are Swarovski crystals...

Thank you John,
Are Swarovski crystals included?
Not of much interest to me, although I have a non Swarovski crystal peacock that I got from a charity shop. Looks good.
I have an ancient 10x40 Porro...
Forum: Others Sunday 17th February 2019, 16:09
Replies: 7
Views: 361
Posted By Binastro
Similar to Lightquest-HR 10x50. High Resolution...

Similar to Lightquest-HR 10x50.
High Resolution Waterproof observation binoculars (Magnesium Body).
But I need to find better photos from a different angle.

B.

P.S.
I didn't find suitable photos...
Forum: Kowa Friday 15th February 2019, 12:53
Replies: 2
Views: 153
Posted By Binastro
Shouldn't this be on the Spotting scopes...

Shouldn't this be on the Spotting scopes section?

Regards
B.
Forum: Binoculars Thursday 14th February 2019, 15:47
Replies: 14
Views: 394
Posted By Binastro
The 80mm f/2.8 Biometers that I dismantled were...

The 80mm f/2.8 Biometers that I dismantled were not good mechanically, so I doubt that Japanese lenses are worse, unless they were built down to a price.

The 50mm f/4 for Pentacon Six had a good...
Forum: Binoculars Thursday 14th February 2019, 11:54
Replies: 14
Views: 394
Posted By Binastro
The Jensen FF was amazing, I think perhaps a U.S....

The Jensen FF was amazing, I think perhaps a U.S. engine. One left me completely standing at the traffic lights.
Our Citroen mechanic had to go on a special course. I am surprised you could fix...
Forum: Binoculars Thursday 14th February 2019, 10:25
Replies: 14
Views: 394
Posted By Binastro
I recently met a distant relative for the first...

I recently met a distant relative for the first time, who has completely rebuilt an E type Jaguar in his spare time.
He also totally stripped and rebuilt the engine at home.

I have great respect for...
Forum: Others Thursday 14th February 2019, 10:05
Replies: 9
Views: 377
Posted By Binastro
Of the 30 6x18 probably Chinese waterproof roof...

Of the 30 6x18 probably Chinese waterproof roof prism IF binoculars.
10 were good.
10 were just about usable.
10 were failures. However, in this instance if they were cut in half, many would make...
Forum: Binoculars Wednesday 13th February 2019, 17:02
Replies: 14
Views: 394
Posted By Binastro
Parts can be exchanged sometimes. Russian prisms...

Parts can be exchanged sometimes.

Russian prisms from some old Porros are exactly the same as some old Zeiss as they were produced on the same machines to the same specs.
My friends measured some...
Forum: Binoculars Wednesday 13th February 2019, 16:24
Replies: 49
Views: 1,660
Posted By Binastro
Lee, They make headaches worse. (:

Lee,

They make headaches worse. (:
Forum: Binoculars Wednesday 13th February 2019, 10:32
Replies: 49
Views: 1,660
Posted By Binastro
I use the expression 'unaided eyes' as the...

I use the expression 'unaided eyes' as the alternative can lead to trouble on some internet sites.

My brain also hurts sometimes.

My head also hurts sometimes, and Migraleve pink seems to have...
Forum: Others Tuesday 12th February 2019, 16:16
Replies: 11
Views: 347
Posted By Binastro
At 70 plus the eyes accommodation is likely to be...

At 70 plus the eyes accommodation is likely to be very small, so it is important to get the dioptre set accurately.
In some binoculars this cannot be easily achieved as there is stiction or drag as...
Forum: Canon Tuesday 12th February 2019, 11:08
Replies: 42
Views: 2,274
Posted By Binastro
Thank you Henry for your detailed and careful...

Thank you Henry for your detailed and careful review.

I have always thought that Canon were using their very good lens designers to design the Canon IS binoculars from the start over 20 years...
Forum: Nikon Monday 11th February 2019, 14:16
Replies: 11
Views: 685
Posted By Binastro
Thanks for the links, especially the first...

Thanks for the links, especially the first one.
Great review.

I see the position is given to an accuracy of 4 inches. At least west and east.
Is that for the front of the binocular or the back (:...
Forum: Binoculars Monday 11th February 2019, 12:17
Replies: 49
Views: 1,660
Posted By Binastro
How many bird watchers actually achieve the...

How many bird watchers actually achieve the sharpness or resolution that one can get in tests of tripod mounted binoculars?

I cannot judge, as I am not an experienced bird watcher, and critically I...
Forum: Canon Saturday 9th February 2019, 21:57
Replies: 42
Views: 2,274
Posted By Binastro
Henry, I assume that the IS is switched off on...

Henry,
I assume that the IS is switched off on the Canon 10x32 IS for the image above.

Regards,
B.
Showing results 1 to 25 of 1000
 


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