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Search: Posts Made By: typo
Forum: Others Sunday 17th March 2019, 10:31
Replies: 15
Views: 476
Posted By typo
I think there lies the issue. Some appreciate the...

I think there lies the issue. Some appreciate the difference that the highest technical excellence makes to their enjoyment of bird and nature watching, but clearly other's do not. Congratulations!...
Forum: Others Saturday 16th March 2019, 14:01
Replies: 16
Views: 594
Posted By typo
Wouldn't it have made life easier to simply...

Wouldn't it have made life easier to simply change you glasses or have them adjusted?

David
Forum: Others Wednesday 13th March 2019, 13:14
Replies: 16
Views: 594
Posted By typo
Olympus, as well as Nikon, Kowa, Pentax and...

Olympus, as well as Nikon, Kowa, Pentax and Fujinon have been using OEM companies for most, if not all of their binocular ranges for years we've been told. Seems this one is made in China.

David
Forum: Binoculars Thursday 7th March 2019, 15:32
Replies: 10
Views: 610
Posted By typo
Just to add to what I posted earlier, the total...

Just to add to what I posted earlier, the total refractive power of the cornea and lens of the eye together is about 60 dioptre.

David
Forum: Binoculars Thursday 7th March 2019, 07:43
Replies: 10
Views: 610
Posted By typo
Dunnin, I was hoping one of our members who is...

Dunnin,

I was hoping one of our members who is an ophthalmologist might spot your post and come to your rescue.

I only recently discovered that the replacement lenses they use for cataract surgery...
Forum: Binoculars Tuesday 5th March 2019, 17:50
Replies: 71
Views: 2,564
Posted By typo
Gijs, So you think Berek "told us nothing new",...

Gijs,

So you think Berek "told us nothing new", yet Holger Merlitz describes his work as an "outstanding achievement". Quite a difference in opinion!

Are you suggesting that the increase in...
Forum: Binoculars Tuesday 5th March 2019, 12:36
Replies: 71
Views: 2,564
Posted By typo
"entscheidender Faktor" refers to the exit pupil...

"entscheidender Faktor" refers to the exit pupil if anyone is was wondering.

I would be very surprise if anyone here didn't understand the pupil response to low light. It was pretty obvious...
Forum: Binoculars Monday 4th March 2019, 21:44
Replies: 71
Views: 2,564
Posted By typo
CB, It was Köhler and Leinhos of Zeiss who...

CB,

It was Köhler and Leinhos of Zeiss who originally studied binocular performance in low light. It wasn't perceived brightness but the increase in distance a level of detail could be resolved at...
Forum: Binoculars Saturday 2nd March 2019, 21:38
Replies: 10
Views: 687
Posted By typo
Dunnin, Firstly just a few numbers to think...

Dunnin,

Firstly just a few numbers to think about.

With average 20/15 eyesight and high quality 10x magnification you should just be able to read Snellen standard letters 10" tall at 1.5 miles. At...
Forum: Canon Tuesday 26th February 2019, 19:32
Replies: 55
Views: 3,399
Posted By typo
Sorry Henry, what is the value of doing that? The...

Sorry Henry, what is the value of doing that? The pupil of the eye cannot contract to 0.5mm.

I had a another look at chapter 1 of Suiter's book and now realise I had made a fundamental error in...
Forum: Canon Tuesday 26th February 2019, 08:30
Replies: 55
Views: 3,399
Posted By typo
Henry, Kimmo, Looks like the target I made for...

Henry, Kimmo,

Looks like the target I made for indoor use was was about 0.1mm or 5-6" at 4m which is probably not good enough, even for stopped down testing. The ballbearing I've used as a glitter...
Forum: Canon Monday 25th February 2019, 17:29
Replies: 55
Views: 3,399
Posted By typo
Henry, Thanks for the warning. Just from...

Henry,

Thanks for the warning.

Just from appearances, I put the effective resolution of that first HT 8x54 I tried between 170 and 190/D. From what I saw of the Zeiss stopped down MTF, it appeared...
Forum: Canon Sunday 24th February 2019, 10:26
Replies: 55
Views: 3,399
Posted By typo
Henry, Would it be right to assume that by "fog"...

Henry,

Would it be right to assume that by "fog" you mean contrast at lower spatial frequencies?

There is much of Suiter's book I still need to digest, but it was interesting to see that modest...
Forum: Canon Saturday 23rd February 2019, 07:00
Replies: 55
Views: 3,399
Posted By typo
Henry, Thanks again for your in depth look at...

Henry,

Thanks again for your in depth look at the Canon. Much appreciated.

The IS did not work well enough to tempt me on their old IS models, or the couple I've seen using Kamakura technology, but...
Forum: Canon Monday 18th February 2019, 19:08
Replies: 55
Views: 3,399
Posted By typo
Henry, Seems I misunderstood you about the...

Henry,

Seems I misunderstood you about the negative target. The mystery over the 110/D result deepens! ;)

Naturally, there is the risk of errors with both excess and too little light.

The US eye...
Forum: Canon Monday 18th February 2019, 05:52
Replies: 55
Views: 3,399
Posted By typo
Henry, I did try to send you a PM explaining my...

Henry,

I did try to send you a PM explaining my questions and concerns, but unfortunately it bounced.

I'm hesitant to post the link, as some of the ensuing discussion became somewhat nonsensical...
Forum: Canon Saturday 16th February 2019, 08:45
Replies: 55
Views: 3,399
Posted By typo
Henry, Thank you for the resolution results....

Henry,

Thank you for the resolution results. Food for thought!

I think we established a few years back that your results are significantly different to mine for some reason, (possibly the choice of...
Forum: Binoculars Thursday 14th February 2019, 19:55
Replies: 70
Views: 2,400
Posted By typo
Bill, you might find 15 minutes on this a useful...

Bill, you might find 15 minutes on this a useful place to start.
http://www.yorku.ca/eye/psf.htm

David
Forum: Canon Thursday 14th February 2019, 16:37
Replies: 55
Views: 3,399
Posted By typo
Henry, Sounds an interesting...

Henry,

Sounds an interesting idea.

Unfortunately I no longer have the image analysis program I knew and trusted, but for what It's worth, the colour analysis app on my tablet gives the R:G:B values...
Forum: Nikon Thursday 14th February 2019, 07:49
Replies: 13
Views: 939
Posted By typo
Kevin, Thank you for the detailed...

Kevin,

Thank you for the detailed comparison.

I've tried the HG 8x42 a lot, but the 8x30 just a few times, just once comparing it to the little Zeiss. I'd agree with you. In the time I had,...
Forum: Binoculars Wednesday 13th February 2019, 21:17
Replies: 70
Views: 2,400
Posted By typo
Bill, If you were fortunate enough to have 20/10...

Bill,

If you were fortunate enough to have 20/10 eyesight you can resolve a letter of line pattern with periodicity of 60 arcseconds. When you look at the night sky, a large star like betelgeuse is...
Forum: Canon Wednesday 13th February 2019, 20:48
Replies: 55
Views: 3,399
Posted By typo
Thanks Henry, It's more the #20 colour/luminance...

Thanks Henry,

It's more the #20 colour/luminance issue that's been taxing me. Whenever I've checked out the ambient light levels, I've been surprised at how much the luminance and illuminance can...
Forum: Canon Tuesday 12th February 2019, 10:04
Replies: 55
Views: 3,399
Posted By typo
Henry, A big thank you for your detailed...

Henry,

A big thank you for your detailed assessment of the Canon. :t: It sounds like a good one. For some reason, the IS stability of It's predecessor did not work well for me. Do you have any...
Forum: Binoculars Tuesday 12th February 2019, 08:11
Replies: 70
Views: 2,400
Posted By typo
Ed, I’ve now had a more detailed look at those...

Ed,

I’ve now had a more detailed look at those two papers. They exploring the computational models for the popular theories of movement detection. Although I mention ball catching, that wasn’t the...
Forum: Binoculars Monday 11th February 2019, 09:27
Replies: 70
Views: 2,400
Posted By typo
Ed, I haven't time to read those articles fully...

Ed,

I haven't time to read those articles fully just nwo but at a glance I'm really not sure they are addressing the same issues? The explanation I offered was distilled from reading countless...
Showing results 1 to 25 of 1000
 


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