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Search: Posts Made By: Binastro
Forum: Canon Yesterday, 16:04
Replies: 63
Views: 6,225
Posted By Binastro
James, I would think that tilted optical...

James,
I would think that tilted optical elements might increase false colour while not affecting other performance characteristics that much.
No binocular optics are actually perfectly aligned....
Forum: Canon Yesterday, 15:55
Replies: 63
Views: 6,225
Posted By Binastro
Hi Henry, I use Canon IS binoculars when I...

Hi Henry,
I use Canon IS binoculars when I require more resolution than a standard hand held binocular can give.
The 18x50 IS and others have a great deal of false colour particularly when the IS is...
Forum: Binoculars Yesterday, 10:12
Replies: 27
Views: 541
Posted By Binastro
Hi wdc, I have seen M33 repeatedly near sea...

Hi wdc,
I have seen M33 repeatedly near sea level, standing under a lit street light in Margate.
Unaided eyes.
I probably saw it a hundred times in half an hour until I got fed up trying.
So at 9700...
Forum: Canon Tuesday 22nd January 2019, 14:26
Replies: 63
Views: 6,225
Posted By Binastro
Hi Henry, When I looked in the front of the newer...

Hi Henry,
When I looked in the front of the newer type 8x25 IS (2014?), which also has a moving lens element rather than the variprism, I could see the lens rapidly moving.
But I think this moving...
Forum: Binoculars Tuesday 22nd January 2019, 10:57
Replies: 27
Views: 541
Posted By Binastro
Hi peatmoss I am not sure about Galileo, but I...

Hi peatmoss
I am not sure about Galileo, but I think that Newton had at least one damaged eye from solar observation.
I think that many early astronomers had eye damage from the Sun.

My colleague,...
Forum: Canon Tuesday 22nd January 2019, 10:38
Replies: 63
Views: 6,225
Posted By Binastro
Henry, Is the CA that you see more about the...

Henry,
Is the CA that you see more about the component introduced by the stabiliser rather than the centred binocular component itself?
I have not tried the new 32mm models but the CA varies a lot...
Forum: Canon Monday 21st January 2019, 23:06
Replies: 63
Views: 6,225
Posted By Binastro
Henry, Interesting indeed. Would a 25x50 or...

Henry,
Interesting indeed.

Would a 25x50 or 30x56 Canon IS binocular be possible?
I think it would, but might cost too much to make, align etc.

Have you looked through a Canon 10x42 IS?
Forum: Binoculars Monday 21st January 2019, 12:06
Replies: 27
Views: 541
Posted By Binastro
The transmission of Galileo's scope was possibly...

The transmission of Galileo's scope was possibly 80%.
I think that his original scope had only two pieces of glass.
A single element objective and single lens eyepiece.

I think that doublet...
Forum: Binoculars Monday 21st January 2019, 11:38
Replies: 29
Views: 929
Posted By Binastro
Hi Lee. I think it is that stars are very high...

Hi Lee.
I think it is that stars are very high contrast point sources basically.

The aircraft are in focus, but I think it is just that at f/2.8 the lens performance is just poor.
Also the G15...
Forum: Binoculars Monday 21st January 2019, 11:12
Replies: 27
Views: 541
Posted By Binastro
Hi all, Well done. Here it was mainly cloudy in...

Hi all,
Well done.

Here it was mainly cloudy in the early hours, and I didn't see much, although I have seen numerous lunar eclipses.
One was so dark that the Moon was almost invisible.
It depends...
Forum: Binoculars Sunday 20th January 2019, 22:50
Replies: 39
Views: 1,497
Posted By Binastro
Hi Lars, Post 28. Have you heard the one 'Alpaca...

Hi Lars,
Post 28.

Have you heard the one 'Alpaca walks into opticians shop'?

I just saw this on the BBC that claimed it spent half an hour perusing the lenses.

Off topic I know, but maybe it...
Forum: Binoculars Sunday 20th January 2019, 16:31
Replies: 29
Views: 929
Posted By Binastro
Lee, You are correct in a way. But both lenses...

Lee,
You are correct in a way.
But both lenses are in fact wide open at the tele lens setting, not stopped down.

Both cameras have superb very fast autofocus in the daytime, and are working at...
Forum: Binoculars Sunday 20th January 2019, 15:57
Replies: 29
Views: 929
Posted By Binastro
With regard to eye relief, not only is there...

With regard to eye relief, not only is there reduced depth of field, but the eye performance is worse in poorer light, both because of a faster f ratio and 'sensor' and processor (brain, eye).

One,...
Forum: Binoculars Wednesday 16th January 2019, 15:40
Replies: 29
Views: 929
Posted By Binastro
I am not sure if this is valid, but I make 7mm...

I am not sure if this is valid, but I make 7mm and 2.5mm cross sections at the front of the eyeball, differing along the axis by 0.5mm.
Forum: Binoculars Wednesday 16th January 2019, 15:04
Replies: 29
Views: 929
Posted By Binastro
Our eyeballs are curved. Maybe this is the reason.

Our eyeballs are curved.
Maybe this is the reason.
Forum: Binoculars Tuesday 15th January 2019, 17:31
Replies: 41
Views: 1,471
Posted By Binastro
I am not surprised that many find a binocular...

I am not surprised that many find a binocular more relaxing than a scope, even if one eye is not so good.
This is probably because of the relaxed viewing, and hand held I find that a binocular is...
Forum: Spotting Scopes & tripod/heads Monday 14th January 2019, 20:40
Replies: 14
Views: 657
Posted By Binastro
Konus, not sure about that. B.

Konus, not sure about that.

B.
Forum: Binoculars Monday 14th January 2019, 17:30
Replies: 41
Views: 1,471
Posted By Binastro
The gain of 40% using a binocular instead of a...

The gain of 40% using a binocular instead of a scope assumes the observer has two equally good eyes and has no prism problems.
Many people have one eye better than the other, so the gain is less and...
Forum: Leica Sunday 13th January 2019, 16:55
Replies: 4
Views: 2,152
Posted By Binastro
Hi and welcome. They may be on holiday. Try...

Hi and welcome.

They may be on holiday.
Try again.
Forum: Binoculars Sunday 13th January 2019, 16:44
Replies: 24
Views: 938
Posted By Binastro
Hi cfranchi. I had the same problem regarding...

Hi cfranchi.

I had the same problem regarding flare control and have settled for an immaculate Leica 8x32 BA as the best all rounder that controls flare very well. I think that a Leica 8x32 BN would...
Forum: Binoculars Sunday 13th January 2019, 16:31
Replies: 18
Views: 1,248
Posted By Binastro
The problem with magazine reviews is that some...

The problem with magazine reviews is that some are clearly influenced by suppliers and advertisers.
Also the reviewers sometimes don't have much knowledge of optics, although this does not mean their...
Forum: Binoculars Saturday 12th January 2019, 17:35
Replies: 18
Views: 1,248
Posted By Binastro
Sky and Telescope binocular tests. These are...

Sky and Telescope binocular tests.
These are independent and are conducted by skilled testers.
However, they are from an astronomy perspective.
Also astronomers do not need some of the features that...
Forum: Pentax Thursday 10th January 2019, 20:06
Replies: 11
Views: 349
Posted By Binastro
The eyepieces have a value. The amount depends on...

The eyepieces have a value.
The amount depends on the eyepiece and condition.

However, there may be other scopes that they fit.
Forum: Spotting Scopes & tripod/heads Wednesday 9th January 2019, 16:12
Replies: 3
Views: 279
Posted By Binastro
I haven't seen or used these more expensive...

I haven't seen or used these more expensive folded refractor scopes, but the Yukon 6x-100x100 folded refractor that I have is optically good, but Yukon vary a lot in quality. It is very light weight...
Forum: Binoculars Wednesday 9th January 2019, 15:45
Replies: 3
Views: 244
Posted By Binastro
Hi Stevie, Maybe ask Action Optics, Southampton...

Hi Stevie,
Maybe ask Action Optics, Southampton or Ace Optics, Bath.
Showing results 1 to 25 of 1000
 


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