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Zeiss at Birdfair 2019

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Old Sunday 18th August 2019, 22:03   #26
tenex
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Quote:
Originally Posted by Vespobuteo View Post
Open-bridge might not be relevant, but works nicely in the 8x32 Swaros I think. An 8x32 SF will probably be quite long as well so open bridge might save some weight.
I dislike open-bridge myself, but do find it less of a problem in a small 32mm glass. That's the EL I find most comfortable to hold, because my fingers can still go pretty much where I want them to.

Quote:
Originally Posted by Troubador View Post
Joerg Schmidt has confirmed SF has HT glass but Zeiss are being coy about where exactly this is employed. One of the objective group is fluoride-doped and the only decent-sized lumps of glass are the prisms, hence the notion that the prisms are likely to have the HT glass.
Thanks for that. Coyness perhaps due to having needed to distinguish the HT line from SF? Though I still wonder, with "only"(!) 92% transmission. Didn't the HT have 95%? Even Leica claims 93%... with HT SP prisms. (Then again, the Swaro SLC 56s with AK prisms have only 93%, not 95 like the Zeiss. So there are inconsistencies here that I don't understand.)

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Last edited by tenex : Monday 19th August 2019 at 12:41.
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Old Monday 19th August 2019, 01:59   #27
John A Roberts
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Use of Schott HT glass

I’ve always assumed from the image in the initial HT brochure, that Schott HT glass is used for at least one of the eyepiece lenses

In contrast, the initial SF brochure states that Schott glass is used for the 'ultra-fluoride lens system' - but has no mention of Schott HT glass
And the expanded 'The Art of Precision' brochure outlines the 'new Ultra-FL concept' for the SF's objectives - and clearly indicates that the focusing lens is fluoride - but again no HT mention
Finally, a labelled SF diagram again mentions Schott fluoride glass but not HT glass

For most of the source material, see my previous post: https://www.birdforum.net/showthread.php?t=370530


John


ps. Leica also uses Schott HT glass: for the prisms in the Ultravid HD+ line, and; while it also uses the glass in the Noctivid line, it does not state whether that's for prisms or lenses
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Last edited by John A Roberts : Monday 19th August 2019 at 03:12.
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Old Monday 19th August 2019, 08:15   #28
John A Roberts
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Taking into account Lee’s comment from post #24:
i.e. “Joerg Schmidt has confirmed SF has HT glass but Zeiss are being coy about where exactly this is employed”
I did a bit of Googling . . .

The term ‘Schott HT glass’ (and ‘Shott HTultra glass’) doesn’t describe glass of a particular chemical composition,
but rather a total of 13 different glasses that have in common the highest transmittance values
See the 2 screen grabs from the Schott website: https://www.us.schott.com/advanced_o...s-origin=en-US

Also see the attached information sheet that indicates the glass is suitable for lenses or prisms (see ‘Supply Forms’)
- so Zeiss’ use verses Leica’s?

Zeiss may be understandably coy about mentioning HT glass in the SF model, since from a marketing viewpoint the primary claim of the HT model is its superior transmission
- both compared to the SF and other brands

And while the HT’s optical superiority is due to the totality of the technology it uses, since it’s named ‘HT’, it would be confusing as a marketing strategy to simultaneously:
- stress that the significant new optical technology it uses is HT glass, and
- then add . . . but so does the SF!

Of course for users this should not be a big issue. As with a sausage, you don't need to know the ingredients to enjoy the result


John
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Last edited by John A Roberts : Monday 19th August 2019 at 08:39.
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Old Tuesday 20th August 2019, 08:15   #29
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Originally Posted by Birdforum View Post

Get your hands on the Victory SF binocular and enjoy the unrivaled field of view and the perfect ergonomics, now also including improved eyecups for a better handling exclusively shown and available for the first time at Birdfair.
Any news/photos of the improved eyecups?
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Old Tuesday 20th August 2019, 10:51   #30
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Originally Posted by Vespobuteo View Post
Any news/photos of the improved eyecups?
I tried an SF with these new eyecups and they felt excellent as they moved up and down, with no sloppy unnecessary movement and the click-stop positions felt very secure.

A big improvement on the old ones which did the job but didn't feel top class while they were doing it.

Lee
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Old Tuesday 20th August 2019, 11:12   #31
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On the Zeiss facebook page there is a tiny photo. However not sure about the model. Is it some RF possibly?
https://www.facebook.com/ZEISSBirdin...type=3&theater
https://www.facebook.com/ZEISSBirdin...type=3&theater
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Old Tuesday 20th August 2019, 11:42   #32
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Quote:
Originally Posted by John A Roberts View Post
Taking into account Lee’s comment from post #24:
i.e. “Joerg Schmidt has confirmed SF has HT glass but Zeiss are being coy about where exactly this is employed”
I did a bit of Googling . . .

The term ‘Schott HT glass’ (and ‘Shott HTultra glass’) doesn’t describe glass of a particular chemical composition,
but rather a total of 13 different glasses that have in common the highest transmittance values
See the 2 screen grabs from the Schott website: https://www.us.schott.com/advanced_o...s-origin=en-US

Also see the attached information sheet that indicates the glass is suitable for lenses or prisms (see ‘Supply Forms’)
- so Zeiss’ use verses Leica’s?

Zeiss may be understandably coy about mentioning HT glass in the SF model, since from a marketing viewpoint the primary claim of the HT model is its superior transmission
- both compared to the SF and other brands

And while the HT’s optical superiority is due to the totality of the technology it uses, since it’s named ‘HT’, it would be confusing as a marketing strategy to simultaneously:
- stress that the significant new optical technology it uses is HT glass, and
- then add . . . but so does the SF!

Of course for users this should not be a big issue. As with a sausage, you don't need to know the ingredients to enjoy the result


John
John, that is correct - the Schott 'HT' glass is a range of 13 different types which could be used anywhere the parameters match.

Zeiss has never been "coy" about anything ! Most of it's claims have bordered on the absurd:-

"Up to and more than 95% transmission" lol ! for the HT ..... this is as a direct result of using HT glass. If you look carefully in the catalogue there will be a footnote somewhere that details the transmission graphs of the various HT glass types are 'guaranteed minimum' values. The corollary being that the 'actual' value 'may' indeed be slightly more depending on the actual batch, alignment of the planets etc. ! That is exactly where this marketing gem has come from.
The other one of course being "Smart Focus" (SF) ..... it would have been more accurate to call it 'Pedestrian Medium Focus' (PMF) !

With Leica using HT glass for the prisms - if Zeiss was doing the same they would be blowing that trumpet long and hard. My guesstimate is that Zeiss is using it in 1 minor lens (probably in the eyepiece) only ...... otherwise if it was more than that and especially the longer light path through the prisms then we wouldn't have the unbalanced 'green ham' colour rendition of the SF.

Part of that is no doubt a conscious decision to differentiate the colour rendition from the HT, but part of it will be completely involuntary due to the limitations of a lack of more HT glass - particularly in the prisms. Now that the HT is gone, there is no reason not to add HT glass to the prisms etc to deliver a better product.




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Old Tuesday 20th August 2019, 18:19   #33
Vespobuteo
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Quote:
Originally Posted by Troubador View Post
I tried an SF with these new eyecups and they felt excellent as they moved up and down, with no sloppy unnecessary movement and the click-stop positions felt very secure.

A big improvement on the old ones which did the job but didn't feel top class while they were doing it.

Lee
May current version SF:s be upgraded with these?
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Old Tuesday 20th August 2019, 18:22   #34
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Originally Posted by Sebzwo View Post
On the Zeiss facebook page there is a tiny photo. However not sure about the model. Is it some RF possibly?
https://www.facebook.com/ZEISSBirdin...type=3&theater
https://www.facebook.com/ZEISSBirdin...type=3&theater
Looks, probably, like RF, but not easy to say.
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Old Tuesday 20th August 2019, 19:49   #35
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May current version SF:s be upgraded with these?
Yes. I called Zeiss UK yesterday and they're sending me a set free of charge.

Alan
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Old Tuesday 20th August 2019, 19:55   #36
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Thumbs up

I had the new eyepieces fitted at Birdfair. They are superb and the equal of eyepieces on any other top of range binocular.
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