Join for FREE
It only takes a minute!
Magnifying the passion for nature. Zeiss Victory Harpia 95. New!

Welcome to BirdForum.
BirdForum is the net's largest birding community, dedicated to wild birds and birding, and is absolutely FREE! You are most welcome to register for an account, which allows you to take part in lively discussions in the forum, post your pictures in the gallery and more.

Showing results 1 to 25 of 1000
Search took 0.09 seconds.
Search: Posts Made By: henry link
Forum: Swarovski Saturday 14th April 2018, 19:44
Replies: 67
Views: 2,193
Posted By henry link
Right Gijs, I should have made it clear that I...

Right Gijs, I should have made it clear that I meant the basic design (cemented doublet achromat, Porro Prism and 6-element Erfle) dates from 1924. In the early years it was Zeiss, Leitz and others...
Forum: Swarovski Saturday 14th April 2018, 18:46
Replies: 67
Views: 2,193
Posted By henry link
Pay no attention to the price difference. The...

Pay no attention to the price difference. The 8x30 Habicht is not at all a clear winner over the 8x30 EII. There are easily demonstrable optical weaknesses in the Habicht, and why not ? It's a nearly...
Forum: Zeiss Friday 13th April 2018, 11:46
Replies: 55
Views: 5,264
Posted By henry link
The AFOV specs seem odd because, rather than...

The AFOV specs seem odd because, rather than using one of the mathematical estimates both Zeiss and Swarovski appear to have been actually measuring AFOV for their specs over last few years....
Forum: Binoculars Wednesday 11th April 2018, 16:21
Replies: 213
Views: 6,869
Posted By henry link
When the 8x56 FL IPD is set for 65mm the...

When the 8x56 FL IPD is set for 65mm the objective spacing is 79mm, and yes, that does produce a little extra stereopsis and a noticeable but slight illusion of a smaller image scale at close range...
Forum: Binoculars Wednesday 11th April 2018, 15:08
Replies: 213
Views: 6,869
Posted By henry link
The difference in sharpness and contrast is...

The difference in sharpness and contrast is noticeable on the USAF chart, just like in the field, but I can't actually resolve the next smallest group of line pairs with the 8x56. It's similar to...
Forum: Binoculars Wednesday 11th April 2018, 14:44
Replies: 213
Views: 6,869
Posted By henry link
I hope it's OK if I pull out this this old post...

I hope it's OK if I pull out this this old post yet again.

https://www.birdforum.net/showpost.php?p=3424981&postcount=17

It shows pretty well how a low aberration image can look sharper and higher...
Forum: Binoculars Tuesday 10th April 2018, 13:08
Replies: 213
Views: 6,869
Posted By henry link
My understanding of the term "bokeh" in...

My understanding of the term "bokeh" in photography is that it refers to the appearance of out-of-focus objects in the background of a photo. A smooth appearance is desirable and that is accomplished...
Forum: Swarovski Sunday 8th April 2018, 19:03
Replies: 21
Views: 1,764
Posted By henry link
The 8x56 and 10x56 can also be ordered directly...

The 8x56 and 10x56 can also be ordered directly from the importer, Swarovski of North America. There is a two week return period for a refund.
Forum: Binoculars Sunday 8th April 2018, 13:19
Replies: 213
Views: 6,869
Posted By henry link
Hi David, You can use the defocused star method...

Hi David,

You can use the defocused star method to observe your own eye's experience of off-axis vignetting at different light levels in different binoculars. Of course you'll have to look off axis...
Forum: Binoculars Sunday 8th April 2018, 12:56
Replies: 48
Views: 1,638
Posted By henry link
I have both of those binoculars. IMO the...

I have both of those binoculars. IMO the Swarovski has only two advantages, considerably higher light transmission and color accuracy (at least compared to my 15 year old EII) and waterproofing.

The...
Forum: Zeiss Sunday 8th April 2018, 12:45
Replies: 14
Views: 519
Posted By henry link
This problem is quite different from the glare we...

This problem is quite different from the glare we usually discuss since it happens when sunlight coming from behind the observer leaks between the observer's face and the eyecup and sends a tiny...
Forum: Swarovski Saturday 7th April 2018, 14:13
Replies: 52
Views: 2,301
Posted By henry link
It's just a fact that the 8x32 SV displays bright...

It's just a fact that the 8x32 SV displays bright internal reflections at the edge of the exit pupil under some common lighting conditions. They're easily photographed through the eyepiece. How have...
Forum: Binoculars Friday 6th April 2018, 13:12
Replies: 213
Views: 6,869
Posted By henry link
I think those articles are examples of people...

I think those articles are examples of people seeing something they like, but not not understanding why. I do tend to a agree with the Audubon author that areas of deep shadow in daylight often do...
Forum: Swarovski Friday 6th April 2018, 12:33
Replies: 52
Views: 2,301
Posted By henry link
Very bright conditions, like viewing close to the...

Very bright conditions, like viewing close to the sun, are not as prone to show glare as dimmer conditions since the eye's pupil is so small in bright light that reflections at the edge of a 4mm exit...
Forum: Zeiss Tuesday 3rd April 2018, 15:30
Replies: 42
Views: 2,948
Posted By henry link
My advice is to ignore the scores or at least pay...

My advice is to ignore the scores or at least pay close attention to how they are arrived at. In this case the scores are "better" for the 10x42 mostly for reasons that either don't make any sense,...
Forum: Others Tuesday 3rd April 2018, 14:34
Replies: 4
Views: 299
Posted By henry link
I don't have enough knowledge of OEM sources to...

I don't have enough knowledge of OEM sources to address all your questions, but I have extensive knowledge of the design of the Bosma 202B01, which I reviewed as the identical Zen-Ray ED2 20-60x 82mm...
Forum: Binoculars Friday 30th March 2018, 15:55
Replies: 55
Views: 1,099
Posted By henry link
Multiply by 52.4.

Multiply by 52.4.
Forum: Vortex Friday 30th March 2018, 12:38
Replies: 13
Views: 8,968
Posted By henry link
Unfortunately, you won't completely escape sample...

Unfortunately, you won't completely escape sample variation by just spending more. Bad or mediocre units are possible even among the most expensive scopes. The same applies to used Spacemasters....
Forum: Binoculars Thursday 29th March 2018, 13:40
Replies: 213
Views: 6,869
Posted By henry link
I assumed the same thing until I tried the 8x54...

I assumed the same thing until I tried the 8x54 HT and found that some large exit pupil binoculars don't meet expectations.

https://www.birdforum.net/showthread.php?t=285414

I'm surprised to see...
Forum: Swarovski Thursday 29th March 2018, 13:28
Replies: 52
Views: 2,301
Posted By henry link
Yes, personal quirks matter. A few very well...

Yes, personal quirks matter. A few very well baffled binoculars, like the Ultravids, are nearly immune to veiling glare IF the eye's pupil is well centered on the exit pupil. It could be that you...
Forum: Swarovski Wednesday 28th March 2018, 18:59
Replies: 52
Views: 2,301
Posted By henry link
The thread below shows the glare problem in an...

The thread below shows the glare problem in an 8x32 Swarovision purchased in July of 2015. If anything has changed it should be obvious from examining the interior under the same glare producing...
Forum: Binoculars Tuesday 27th March 2018, 17:34
Replies: 2
Views: 255
Posted By henry link
Hi John, I agree that method is very handy. I...

Hi John,

I agree that method is very handy. I think the 2009 thread below contains the first mention of it here.

https://www.birdforum.net/showthread.php?t=146768&highlight=apparent+field

Henry
Forum: Kowa Tuesday 27th March 2018, 02:51
Replies: 4
Views: 491
Posted By henry link
slingworks, The TS-9 was an inexpensive scope....

slingworks,

The TS-9 was an inexpensive scope. I've got an old Christophers, Ltd price list from 1992 that lists the straight version with an 11-33x zoom for $193.00 and the angled version with zoom...
Forum: Zen Ray Wednesday 21st March 2018, 15:57
Replies: 82
Views: 4,805
Posted By henry link
Zen-Ray's Portland address on the Buzzfile page...

Zen-Ray's Portland address on the Buzzfile page is a house in a residential neighborhood.
Forum: Zeiss Saturday 17th March 2018, 14:05
Replies: 42
Views: 2,948
Posted By henry link
Well, it doesn't quite work like that. The...

Well, it doesn't quite work like that. The off-axis astigmatism in the binocular changes its "axis" around the edge like the hands on a clock face. If your eyesight astigmatism happened to be the...
Showing results 1 to 25 of 1000
 


Fatbirder's Top 1000 Birding Websites

Help support BirdForum

Page generated in 0.18497491 seconds with 8 queries
All times are GMT. The time now is 01:52.