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Search: Posts Made By: henry link
Forum: Nikon Sunday 14th July 2019, 18:41
Replies: 25
Views: 852
Posted By henry link
There is no standard distance. There's a formula...

There is no standard distance. There's a formula for converting the line pairs per mm resolved on the target at the distance you choose into seconds of arc.

I'm sorry to have suggested something...
Forum: Nikon Saturday 13th July 2019, 16:03
Replies: 25
Views: 852
Posted By henry link
Thanks Binastro, I meant 25 meters. I'll correct...

Thanks Binastro,

I meant 25 meters. I'll correct the distance on the original post.

The Monarch focal length is about 505mm, 1.66 feet

Henry
Forum: Nikon Saturday 13th July 2019, 13:57
Replies: 25
Views: 852
Posted By henry link
First a caution about daylight star-testing. A...

First a caution about daylight star-testing. A couple of years ago I was alarmed by one forum member who proposed to use the sun's reflection from a flat window pane. That would produce a large disk...
Forum: Nikon Thursday 11th July 2019, 13:34
Replies: 49
Views: 2,801
Posted By henry link
Hi Steve, Yes, you are correct. The Monarch...

Hi Steve,

Yes, you are correct. The Monarch competes optically with "the very best" and beats most of them. The unit I tested was a sensibly perfect telescope. I've never seen a birding scope with...
Forum: Nikon Wednesday 10th July 2019, 00:01
Replies: 49
Views: 2,801
Posted By henry link
The prism housings of both the 82mm and 60mm...

The prism housings of both the 82mm and 60mm Monarchs look identical to me, apparently the same size and both have the offset, so while I haven't seen the 60mm I'm pretty sure the prisms are...
Forum: Nikon Wednesday 3rd July 2019, 13:35
Replies: 49
Views: 2,801
Posted By henry link
Let's hope the 55 mm Prominar's pricing is a one...

Let's hope the 55 mm Prominar's pricing is a one time anomaly. That scope's prism focusing system and modest fixed zoom eyepiece would be more at home in a $500 scope. A 55 mm Fluorite element cannot...
Forum: Zeiss Wednesday 3rd July 2019, 13:11
Replies: 12
Views: 591
Posted By henry link
At the risk of adding confusion I think it's...

At the risk of adding confusion I think it's worth noting that Schmidt-Pechan prisms can be configured in different ways.

The diagram John provided shows an S-P in which the light travels through...
Forum: Zeiss Monday 1st July 2019, 12:32
Replies: 12
Views: 591
Posted By henry link
Here's a cutaway of the 8x30 Dialyt: cemented...

Here's a cutaway of the 8x30 Dialyt: cemented doublet objective lens, 4 element Konig eyepiece. A simple design, but nothing obvious there except a lack of phase correction that would prevent it from...
Forum: Nikon Sunday 30th June 2019, 20:01
Replies: 49
Views: 2,801
Posted By henry link
I'd call that an amazing run of good luck. ;)

I'd call that an amazing run of good luck. ;)
Forum: Nikon Sunday 30th June 2019, 19:56
Replies: 49
Views: 2,801
Posted By henry link
There are no images because my camera died just...

There are no images because my camera died just before I borrowed the scope. I might not have posted star-test images anyway. I've found it's easy enough to photograph defects in star tests, but...
Forum: Nikon Saturday 29th June 2019, 16:53
Replies: 49
Views: 2,801
Posted By henry link
I've star tested six 883s. Two were very good (I...

I've star tested six 883s. Two were very good (I might have bought one of those if they hadn't already been spoken for), two where outright lemons and two fell into the category of OK, but not good...
Forum: Binoculars Sunday 9th June 2019, 16:12
Replies: 70
Views: 3,222
Posted By henry link
Hi Traveller, I also thought the E II eyepiece...

Hi Traveller,

I also thought the E II eyepiece was 5 elements in 3 groups when I first saw the X-ray in the Allbinos article. Arek supplied a better X-ray image of the eyepiece which makes it clear...
Forum: Nikon Friday 7th June 2019, 15:22
Replies: 49
Views: 2,801
Posted By henry link
Thanks Joachim, Next time I see the scope I'll...

Thanks Joachim,

Next time I see the scope I'll check for threads. I don't recall seeing any, but if there are any I'll try to measure them.

Henry
Forum: Nikon Friday 7th June 2019, 15:14
Replies: 49
Views: 2,801
Posted By henry link
Looks like the "$4000" scopes are closer to $5000...

Looks like the "$4000" scopes are closer to $5000 now, at least for the 95mm versions. That's a lot for a small refractor. If the optics were exquisite and the performance of each unit were...
Forum: Nikon Wednesday 5th June 2019, 20:59
Replies: 49
Views: 2,801
Posted By henry link
Monarch 82ED, a Perfect Ten

I recently spent a pleasant few hours evaluating a scope that exceeded my expectations in nearly every way. The Nikon Monarch 82ED has been around for over 2 years now, but it doesn’t seem to have...
Forum: Kowa Wednesday 5th June 2019, 15:54
Replies: 45
Views: 1,874
Posted By henry link
This is certainly not true for the $1600 Nikon...

This is certainly not true for the $1600 Nikon Monarch 82ED. One I recently tested had better optics (adjusted for aperture) than than all but one or two cherry samples of the six Kowa 883s and four...
Forum: Nikon Saturday 1st June 2019, 13:42
Replies: 103
Views: 5,291
Posted By henry link
Hey Kevin, While the oversized Schmidt prism has...

Hey Kevin,

While the oversized Schmidt prism has been retained from the Fieldscopes the focal length of the Monarch 82ED appears to be a little shorter than the 82mm Fieldscope, so maybe similar but...
Forum: Kowa Friday 31st May 2019, 21:20
Replies: 9
Views: 676
Posted By henry link
Sorry, I've been a bit lax about getting around...

Sorry, I've been a bit lax about getting around to the Nikon Monarch review. It will probably be the middle of the week before I can post it, but I would suggest to anybody thinking of a scope...
Forum: Nikon Tuesday 28th May 2019, 18:54
Replies: 103
Views: 5,291
Posted By henry link
The current Monarch ED spotting scopes shouldn't...

The current Monarch ED spotting scopes shouldn't be underestimated, but they may also founder from a lack of marketing support. They've been around for over two years, but little has been written...
Forum: Binoculars Sunday 26th May 2019, 16:14
Replies: 70
Views: 3,222
Posted By henry link
Here's a cutaway of the 10x40 W Habicht below....

Here's a cutaway of the 10x40 W Habicht below. The 8x30 W is identical except for a shorter objective tube and smaller objective lens. The only significant difference between the Habicht and Zeiss...
Forum: Binoculars Saturday 25th May 2019, 23:45
Replies: 70
Views: 3,222
Posted By henry link
The very same 6 element, 3 group Erfle (patented...

The very same 6 element, 3 group Erfle (patented in 1923) is used in both the 8x30 and 10x40 Habichts. There are 12 glass to air surfaces total. The Nikon SE and EII have six element eyepieces, but...
Forum: Binoculars Wednesday 22nd May 2019, 17:16
Replies: 57
Views: 3,427
Posted By henry link
The parallax from widely spaced objectives forces...

The parallax from widely spaced objectives forces the eyes to view centered objects at close range too far off-axis for comfort or good alignment with the optical axes of the binocular telescopes....
Forum: Binoculars Wednesday 22nd May 2019, 15:13
Replies: 57
Views: 3,427
Posted By henry link
In my experience the optically "easiest" view...

In my experience the optically "easiest" view requires that nearly every item on the list of criteria below be present in the same binocular, which is rare. The list is arranged roughly in order of...
Forum: Swarovski Friday 10th May 2019, 02:38
Replies: 48
Views: 2,910
Posted By henry link
As quoted by Henry Link from a thread on AFOV....

As quoted by Henry Link from a thread on AFOV. The thread link is at the bottom.

"Nikon has just adopted the method described here for AFOV...
Forum: Binoculars Monday 29th April 2019, 21:10
Replies: 76
Views: 4,185
Posted By henry link
Hey Lee, Just to keep the record straight that...

Hey Lee,

Just to keep the record straight that diagram incorrectly suggests there are two lenses when really there is only one. The straight line at the top of the field flattener actually...
Showing results 1 to 25 of 1000
 


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