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Search: Posts Made By: John A Roberts
Forum: Swarovski Today, 10:14
Replies: 21
Views: 802
Posted By John A Roberts
Hi Tenex (post #20), Thanks for correcting the...

Hi Tenex (post #20),

Thanks for correcting the bad link that I posted

And clearly I worded my opening paragraphs poorly
The first should have read: ‘ . . . the graph . . . shows a progressive loss...
Forum: Opus Discussion Area Yesterday, 08:46
Replies: 2
Views: 89
Posted By John A Roberts
Hi JZ, The pre-FL 8x40 Victory was the subject...

Hi JZ,

The pre-FL 8x40 Victory was the subject of a thread earlier this year
At the time I contributed various information, including copies of some reviews from when it was introduced
see here:...
Forum: Swarovski Yesterday, 01:00
Replies: 21
Views: 802
Posted By John A Roberts
Shake verses Useable Image Quality The effect of...

Shake verses Useable Image Quality

The effect of shake, specifically with a free-standing hands only hold, seems to be far more complex than what various psychological studies indicate
e.g. as in...
Forum: Swarovski Friday 13th September 2019, 22:56
Replies: 21
Views: 802
Posted By John A Roberts
Rolling Ball Effect? Hi Tom/ SeldomPerched (post...

Rolling Ball Effect?

Hi Tom/ SeldomPerched (post #6),

Image distortion isn't a function of objective size but rather a consequence of considerations/ compromises made by optical designers

In post...
Forum: Others Friday 13th September 2019, 09:47
Replies: 3
Views: 205
Posted By John A Roberts
SteveTS PM’d about my post He raised the point...

SteveTS PM’d about my post

He raised the point that ‘beauty is in the eye of the beholder’, and thinking about that led to me responding with the following:

‘Of course you’re right about the...
Forum: Others Friday 13th September 2019, 03:44
Replies: 3
Views: 205
Posted By John A Roberts
Weaver Super Slam - an Interesting Oddity?

In the Binocular Bargains thread, SteveTS recently posted about Weaver Super Slam 8.5x45’s that were on sale for $399 US, see: https://www.birdforum.net/showpost.php?p=3889001&postcount=3840
These...
Forum: Nikon Thursday 12th September 2019, 07:26
Replies: 9
Views: 482
Posted By John A Roberts
Earlier E Series': Numbering, Production and...

Earlier E Series': Numbering, Production and Popularity
In contrast to the EII, previous versions of the E series were far more popular, and increasingly so as one goes back in time - when they were...
Forum: Nikon Thursday 12th September 2019, 06:34
Replies: 9
Views: 482
Posted By John A Roberts
Hi Mike, Thanks for confirming my speculation...

Hi Mike,

Thanks for confirming my speculation about the 10x35 version


EII 10x35 Numbering
Again based on my observation, there appears to be 3 main ranges for the 10x35 in the following order:
A)...
Forum: Nikon Wednesday 11th September 2019, 21:12
Replies: 9
Views: 482
Posted By John A Roberts
Refining when the Change Commenced on the EII...

Refining when the Change Commenced on the EII 8x30

Andy/ dries1 PM’d me the following:

‘My 8x30 EII's:
Regular - No. 821029
Anniversary Edition - No. 081943

They are both the same, I could not...
Forum: Nikon Wednesday 11th September 2019, 00:39
Replies: 9
Views: 482
Posted By John A Roberts
Gijs van Ginkel’s Transmission Data In April...

Gijs van Ginkel’s Transmission Data

In April 2013, Gijs published transmission data for a variety of Nikon Porro prism binoculars

At the time, the report generated questions as to the seemingly too...
Forum: Nikon Wednesday 11th September 2019, 00:34
Replies: 9
Views: 482
Posted By John A Roberts
Earlier EII Transmission The EII line was...

Earlier EII Transmission
The EII line was introduced in 1999 and has since been in continuous production
And while there is great affection by many for the EII, it’s relative lack of brightness has...
Forum: Nikon Wednesday 11th September 2019, 00:29
Replies: 9
Views: 482
Posted By John A Roberts
EII - Increased Brightness following on from 100th Anniversary Edition

To mark its 100th anniversary in June 2017, Nikon offered several products. It:
- produced several limited edition cameras and accessories
- introduced the remarkable WX binoculars, and
- produced a...
Forum: Binoculars Sunday 8th September 2019, 01:53
Replies: 14
Views: 1,133
Posted By John A Roberts
Many of us have been asked something along the...

Many of us have been asked something along the lines of ‘Since you seem to know about binoculars, what do you recommend? I want something that’s good quality but reasonably priced’

So having asked...
Forum: Binoculars Saturday 7th September 2019, 22:36
Replies: 51
Views: 1,761
Posted By John A Roberts
Hi Daniel. Two observations and a question . . ....

Hi Daniel.

Two observations and a question . . .

As to the Swarovski’s becoming a literal pain in the neck on longer walks, an under appreciated accessory for carrying binoculars is the Crooked...
Forum: Leica Thursday 5th September 2019, 23:06
Replies: 8
Views: 894
Posted By John A Roberts
To inspire some Leica Love for the Duovids, a...

To inspire some Leica Love for the Duovids, a pair of images:
- the first from Leica
- the second showing the alternative green version

The second is from the Dutch site ‘Twentse Vogelwerkgroep’,...
Forum: Binoculars Thursday 5th September 2019, 08:39
Replies: 14
Views: 1,133
Posted By John A Roberts
Hi Pluto, Providing you’re not in a hurry to...

Hi Pluto,

Providing you’re not in a hurry to buy, the way to maximise the price to performance ratio is to buy second-hand

Most of my binocular purchases have been second-hand. And particularly...
Forum: Swarovski Wednesday 4th September 2019, 23:48
Replies: 28
Views: 1,943
Posted By John A Roberts
And considering the above as preamble to getting...

And considering the above as preamble to getting back to the original topic . . .

A deeper issue common to much use of digital technology is that it provides convenience at the cost of...
Forum: Swarovski Wednesday 4th September 2019, 23:46
Replies: 28
Views: 1,943
Posted By John A Roberts
In relation to rangefinder binoculars . . . The...

In relation to rangefinder binoculars . . .

The point I was making in post #11 was about the problems of integrating electronics - that are by nature ephemeral - into what’s primarily a long lived...
Forum: Swarovski Wednesday 4th September 2019, 00:43
Replies: 1
Views: 153
Posted By John A Roberts
And for those wanting more detail, I’ve attached...

And for those wanting more detail, I’ve attached full copies of the STR cross sections, the patent, and Fact Sheet


John
Forum: Swarovski Wednesday 4th September 2019, 00:39
Replies: 1
Views: 153
Posted By John A Roberts
STR Telescope - Reticle System

In 2015, Omid started a thread inquiring as to how the reticle projection system on the STR telescope works
There were nearly 1,400 views but no replies! (see:...
Forum: Binoculars Tuesday 3rd September 2019, 00:18
Replies: 36
Views: 2,654
Posted By John A Roberts
Zeiss graphic confirms use of Schott HT glass in...

Zeiss graphic confirms use of Schott HT glass in SF line

In relation to posts #24 and #28, see the attached graphic where Zeiss confirms the above (download the pdf for a more legible version)
It's...
Forum: Zeiss Tuesday 3rd September 2019, 00:12
Replies: 4
Views: 376
Posted By John A Roberts
Zeiss Graphic - Binocular Features & Uses

Looking at the Zeiss website I came across this recently posted graphic (download the pdf for a more legible version)
It's from:...
Forum: Zeiss Monday 2nd September 2019, 22:27
Replies: 22
Views: 1,488
Posted By John A Roberts
Hi Binastro, Like you I find some of the values...

Hi Binastro,

Like you I find some of the values strange. But as the article neither:
- explains the methodology (which is presumedly their standard one), nor
- addresses the reason for the entry...
Forum: Zeiss Sunday 1st September 2019, 23:29
Replies: 22
Views: 1,488
Posted By John A Roberts
I posted elsewhere an image of three...

I posted elsewhere an image of three rangefinders, to show their comparative sizes: the Leica HD-B 8x42, the Zeiss Victory 8x45 and the Swarovski EL Range 8x42

The image comes from a 2013 article in...
Forum: Swarovski Sunday 1st September 2019, 23:03
Replies: 28
Views: 1,943
Posted By John A Roberts
Source of Image in post #10 I've now located a...

Source of Image in post #10

I've now located a source for the image, showing the relative sizes of the three RF binoculars: the Leica HD-B 8x42, the Zeiss Victory 8x45 and the Swarovski EL Range...
Showing results 1 to 25 of 247
 


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