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  1. L

    Which of the older Trinovids are best ?

    For reference in this discussion, listed below are sites with what appear to be quite thorough histories of Leitz/Leica binocular models, with dates of introduction. Data in them for earlier models is credited to Peter Abrahams, one of whose compilations I cited in posting #5 above...
  2. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    LarryO said: The eye, using a simple lens, suffers from longitudinal chromatic aberration, so its ability to accommodate for different distances in a view can depend on the distribution of colors in the light involved. ------------------ tenex said: "Suffers? There's good evidence now that the...
  3. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    LarryO said: There are actual transmission spectra for a Trinovid BN 10x42 and an Ultravid (non HD) 10x42 in post #4 of the thread 'Coatings Questions' <Coatings questions>... The spectra do display differences, and the post discusses ideas about which of those might affect perceived brightness...
  4. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Jerry - It makes perfect sense. As mentioned in my post #23 here, and again in post #44, at least one coatings engineer also said that little could be deduced from reflected coating colors about actual spectral transmission and that the reflected colors could, to some extent, even be chosen to...
  5. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Some comments: 1. There might not be large numbers of birdforum members who have possessed multiple examples of the same alpha-binocular model displaying different coating colors, let alone members who have had the examples in hand at the same time. That could account for there not having been...
  6. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    My apologies. I may have tried too hard to compress what the sentence was meant to convey about why several aspects of binocular performance might depend on the spectral transmission of different lens coatings. Following is an attempted breakdown: "The idea, maybe 'absurd'..." -- This was...
  7. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    The idea, maybe 'absurd,' was that apparent depth of field in a pair of binoculars, as opposed to that in a photograph, could vary with eye accommodation to visual distance and thus with the color spectrum involved. One bit of helpful input on the point might be comparisons of apparent...
  8. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Those reports of differences in focusing requirements, apparent depth of field, and view vividness for different coatings within a model run are observations I have not heard before. One possibility is that differences of transmission spectra accompanying different coatings could be involved...
  9. L

    The three Trinovids battle

    Mike - I sympathize with your confusion. It's not easy to sort out the differences among Trinovid generations. I've made a stab at it using design features and illustrations in various Leica catalogs and photos on eBay, mostly in the interest of having comparisons between Trinovid and...
  10. L

    The three Trinovids battle

    durobird - Thank you for that very welcome comparison among three Trinovid compact models. I have found that there may have been at least four versions of the compact Trinovids, if versions were distinguished by changes of their model numbers in Leica brochures. I listed model numbers of...
  11. L

    Which of the older Trinovids are best ?

    The Leica Trinovid BAs introduced in 1990 did have phase coatings. That is stated among features of the BAs in copies of pages from a Leica brochure posted by 'casscade' in the following two threads (with different cropping of the copies in the threads): Leica Lens Coatings post #1 <Leica...
  12. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Mike & casscade - I've mentioned it in earlier posts of this thread, but it seems worth mentioning again the venerable thread 'Coatings Questions' <Coatings questions>, June, 2008. It includes posts of actual transmittance spectra for Trinovid 10x42BN, 10x42Ultravid(non HD), and Trinovid...
  13. L

    New birdnerd, seeking advice on found Leica binoculars.

    My understanding is that cloths, or liquids, designed for eyeglasses are generally NOT recommended for high-quality coated optics and can damage the coatings. (An exception might be modern 'microfiber' cloths.) It is important to remove dust, e.g., with a 'blower-brush,' before any other...
  14. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Mike - Thank you for those photos of the coatings on your binocular 'siblings'! The color difference is very apparent to me -- one with a bluish tone, the other with a purplish one. They suggest an explanation that I haven't seen considered, namely that, even within a binocular version's...
  15. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Mike - Thank you for both your comments. Different coating colors of optics in two similar-age, identical-model binoculars of a single vendor (Leica) does, indeed, argue against contemporary fashion as a determinant of color, at least for models in that vendor's products. In fact, it seems...
  16. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    casscade - Thank you for another informative post. In the copied text you provided, the author indicates that at German optics company Schmidt & Bender, "coatings are actually custom-tailored to individual batches of glass, which can result in varying color of the finished product." In this...
  17. L

    Ultravid BCAs vs *current* Trinovid BCAs - real optical difference or mostly mechanical?

    Yet more complications in the Trinovid BCA line -- Here are some version numbers for 8x20 BCAs taken from Leica literature, including yet another one found. The age designations -- 'old,' 'new,' etc. -- follow those in dorubird's post #11. Trinovid 8x20 BCA versions: # 40307 Old version, with...
  18. L

    Ultravid BCAs vs *current* Trinovid BCAs - real optical difference or mostly mechanical?

    Helpful posts by Canip and dorubird seem to confirm one cause for the wide disparity among comparisons between Trinovid and Ultravid BCA models -- ranging from reports of dramatic, readily seen differences to ones of evident, but more subtle differences requiring side-by-side comparisons. The...
  19. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    casscade - Thank you for posting those catalog pages from the Trinovid BA ('Ultra') era in the thread. They are not only very informative but great fun to see, particularly that elegantly clear cutaway illustration. They were really proud of the Trinovid construction in those days. And those...
  20. L

    Ultravid BCAs vs *current* Trinovid BCAs - real optical difference or mostly mechanical?

    Thank you for that helpful comparison, exactly the one I was seeking. Others have suggested very dramatic improvements of the Ultravid BCAs over the Trinovids. So I still wonder whether they might have been comparing older-version Trinovids to the Ultravids. It would be interesting to have a...
  21. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    In another thread, 'Leica Lens Coatings,' casscade has posted a historic Leica catalog page outlining advantages of the 'Trinovid Ultra' binoculars, the name first assigned to the Trinovid BA line. It confirms many features already incorporated in the BAs but only widely touted for later...
  22. L

    Leica Lens Coatings

    ... Thank you for posting this catalog page. It appears to confirm several of the conjectures I tried to summarize in an earlier post starting a thread -- 'Trinovid BAs still a 'sweet spot' among Leica binoculars?' One main theme was that the BAs enjoyed many of the optical advantages that...
  23. L

    Ultravid BCAs vs *current* Trinovid BCAs - real optical difference or mostly mechanical?

    Questions about current compact Leica 8x20 BCA models: I have seen several informal reviews praising the superior brightness and clarity of the Ultravid 8x20 BCA over the Trinovid 8x20 BCA models. This is a question about which 'Trinovid' version, older or current, has been involved in these...
  24. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    This was one of the advantages of the BA models mentioned in my original post: "-- focus range extending beyond infinity, of some help in particular to myopic users: There was a general change of focus range between BA and BN models. The BNs had a well-advertised closer near focus point...
  25. L

    Trinovid BAs still a 'sweet spot' among Leica binoculars?

    Re: eitanaltman's "contrary stance" comparing Trinovid BAs and Ultravids An extensive discussion of coatings and color transmission for Leica Trinovids and Ultravids is in the following birdforum.net thread, also mentioned previously: Coatings questions...
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