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Search: Posts Made By: typo
Forum: Binoculars Yesterday, 16:42
Replies: 50
Views: 1,910
Posted By typo
Steve, I've already posted this in another...

Steve,

I've already posted this in another thread but it's probably helpful to do again here.
http://www.physicsinsights.org/simple_optics_brightness_1.html

Those studies by Berek and Leinhos...
Forum: Binoculars Yesterday, 15:01
Replies: 50
Views: 1,910
Posted By typo
Lee, It seems that you have not understood the...

Lee,

It seems that you have not understood the fundamental points debated in this thread so I'll recap on a few points.

Rico claimed in #1 to have invented a formula that shows that the luminous...
Forum: Meopta Friday 17th January 2020, 23:52
Replies: 4
Views: 267
Posted By typo
Thanks for the info. I really hoped this would be...

Thanks for the info. I really hoped this would be the year for the Meostar update, but with that price tag it might be a serious contender. Anyone going to the SHOT show?

David
Forum: Binoculars Friday 17th January 2020, 12:23
Replies: 156
Views: 4,580
Posted By typo
In case anyone wasn't sure about Rico's claims...

In case anyone wasn't sure about Rico's claims that 'brightness' changing with magnification there are loads of articles on the internet that state plainly that it cannot, but this one popped out...
Forum: Zeiss Thursday 16th January 2020, 15:06
Replies: 21
Views: 874
Posted By typo
I don't know where Gigs found those plots, but...

I don't know where Gigs found those plots, but the first screenshot attached shows a plot of the current CIE 2006 luminosity function. The second screenshot is from Nature 26756 (2016) that shows...
Forum: Zeiss Thursday 16th January 2020, 09:53
Replies: 21
Views: 874
Posted By typo
Tom, You can download Holger's paper by clicking...

Tom,

You can download Holger's paper by clicking the link at the bottom of the introductory section here.
https://www.birdforum.net/showthread.php?t=385328

What the work of Berek (in that paper)...
Forum: Binoculars Thursday 16th January 2020, 07:55
Replies: 156
Views: 4,580
Posted By typo
Introception, Thank you for that eloquent...

Introception,

Thank you for that eloquent explaination.

Perhaps you will find it useful to have a look at the discussion that followed Rico's original post on this subject....
Forum: Binoculars Thursday 16th January 2020, 03:53
Replies: 156
Views: 4,580
Posted By typo
Lee, I think it's worth looking again at Rico's...

Lee,

I think it's worth looking again at Rico's post again in it's entirety so we don't take this "too bright" comment out of context.



"the exit pupil is not the only factor to calculate the...
Forum: Binoculars Tuesday 14th January 2020, 21:54
Replies: 6
Views: 226
Posted By typo
Roberto, Mpeace is right, your post can be read...

Roberto,

Mpeace is right, your post can be read that way too. I prefer my glasses to touch the eye cups for stability. My glasses are fairly close fitting, so on most binocular models I prefer to...
Forum: Binoculars Tuesday 14th January 2020, 20:19
Replies: 6
Views: 226
Posted By typo
Hi Roberto, I suppose I must have tried out two...

Hi Roberto,

I suppose I must have tried out two or three hundred different 8x and 10x binoculars with their eye cups fully down and not once have the lenses of my glasses touched those of the eye...
Forum: Binoculars Monday 13th January 2020, 21:43
Replies: 156
Views: 4,580
Posted By typo
Celestron have a regular stand at the UK Birdfair...

Celestron have a regular stand at the UK Birdfair and they put a bit more of their astro stuff on show a couple of years ago. I tried the 25x70 and 20x80 on tripods and the 15x70 hand held. I...
Forum: Vortex Monday 13th January 2020, 10:20
Replies: 3
Views: 206
Posted By typo
Hello Sean, I thought by now you might have had...

Hello Sean,

I thought by now you might have had some comments from some that have a closer look than I have. I've really only done a quick side by side with the Diamondback HD on the Vortex stand at...
Forum: Binoculars Monday 13th January 2020, 09:15
Replies: 156
Views: 4,580
Posted By typo
Lee, re. #97 This is to do with Rico's magic...

Lee, re. #97

This is to do with Rico's magic formula for Light power. The numbers in that first series all come to about 63. So between dawn and sunset when terrestrial luminance can vary a...
Forum: Vortex Friday 10th January 2020, 22:19
Replies: 4
Views: 341
Posted By typo
SzimiS, It sounds a really unfortunate...

SzimiS,

It sounds a really unfortunate dilemma.

It's never easy to see things through someone else's eyes, but there are very good binoculars out there at sub-alpha prices. It just depends on your...
Forum: Binoculars Thursday 9th January 2020, 19:48
Replies: 3
Views: 398
Posted By typo
Testing Binocular Stability

I think it might be timely to reclaim some reality by going back to one of my little back yard studies on the subject of binoculars and stability, and offer a little new data. I know it's a topic...
Forum: Binoculars Thursday 2nd January 2020, 09:15
Replies: 156
Views: 4,580
Posted By typo
Rico, In your short time on the forum you have...

Rico,

In your short time on the forum you have caused serious offence to many, including those with considerably greater technical knowledge and observation skills and experiece than obviously you...
Forum: Binoculars Monday 30th December 2019, 18:00
Replies: 39
Views: 1,839
Posted By typo
My personally preference would for the colour,...

My personally preference would for the colour, contrast and sharpness characteristics of the Noctivid, but they probably wouldn't be my first choice for ergonomics. Though I suspect that's something...
Forum: Nikon Tuesday 24th December 2019, 08:10
Replies: 98
Views: 3,736
Posted By typo
Tennex, You are technically correct in that...

Tennex,

You are technically correct in that statement in that the Vukobratovich plot shows the effective magnification of a hand held 10x binocular is 5.8x and a 15x binocular is 6.2x, but with the...
Forum: Leica Tuesday 24th December 2019, 06:02
Replies: 267
Views: 12,746
Posted By typo
Welcome back Jan. It's hard to understand why...

Welcome back Jan. It's hard to understand why Leica would undermine it's retailer's in this way.

David
Forum: Nikon Friday 20th December 2019, 10:18
Replies: 98
Views: 3,736
Posted By typo
I got suckered too.:-C David

I got suckered too.:-C

David
Forum: Binoculars Wednesday 18th December 2019, 16:12
Replies: 18
Views: 685
Posted By typo
John, Rico was kind enough to send me a link to...

John,

Rico was kind enough to send me a link to the article he used for his information. It's in Italian but on this occasion Google translate does a reasonable...
Forum: Binoculars Wednesday 18th December 2019, 13:25
Replies: 50
Views: 1,910
Posted By typo
CJ, Much of the apparent brightness difference...

CJ,

Much of the apparent brightness difference is probably due to the level of mismatch between the transmission spectum and the ambient light, but other factors are likely to play a part as well....
Forum: Binoculars Wednesday 18th December 2019, 12:23
Replies: 50
Views: 1,910
Posted By typo
Rico, The reason many experimental theories fail...

Rico,

The reason many experimental theories fail is that the variables have not been identified, quantitated or controlled. You have systematically ignored them so yours was doomed from the...
Forum: Nikon Wednesday 18th December 2019, 09:45
Replies: 98
Views: 3,736
Posted By typo
Jay, Joachim has made some useful suggestion....

Jay,

Joachim has made some useful suggestion. I'll send you a link by PM to a company that often has Nikon porros at a reasonable price... with some notes of caution.

David
Forum: Binoculars Wednesday 18th December 2019, 08:40
Replies: 50
Views: 1,910
Posted By typo
Rico, Yes the brightness ranking was 10x42 >...

Rico,

Yes the brightness ranking was 10x42 > 735 > 842, and as I explained, I took the greatest care I could, under the circumstances, to judge apparent brightness alone. The ranking would be...
Showing results 1 to 25 of 1000
 


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