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  1. John A Roberts

    Swarovski SL porro models

    Laser Filters image (see post #9) A recent post elsewhere, prompted me to realise that I neglected to include an image of the laser filters that were used in the French Navy units The green filters are shown next to the objective housings. The image is from the same source as the last one in...
  2. John A Roberts

    Swarovski SL porro models

    SL Numbering and Dating SL numbering is somewhat complicated, which is why I’ve not addressed it before, but a recent query prompted me to get my notes together . . . In brief: A) From their introduction in 1980, SL’s used numeric numbering in what appears to have been various ongoing batch...
  3. John A Roberts

    Swarovski SL porro models

    Hi Swedpat, That’s an interesting observation about the SL’s lack of reflections around the exit pupil, since the traditional Habicht Porros are poor in that regard e.g. see the comment and images in Allbinos review of a 10x40 unit...
  4. John A Roberts

    Swarovski SL porro models

    Hi Gijs (post #15), Mea Culpa! - you are of course correct. My sin was was the error of brevity The meaning of Habicht as originally used by Swarovski Optik, comprised both the Northern Goshawk and the Habicht mountain (30 km or so from Absam as the hawk flies) And obviously both meanings...
  5. John A Roberts

    Swarovski SL porro models

    Diopter Index Mark Hi tenex (post #12), Although it’s very hard to see in most photographs, there is an index triangle on the back of the right hand housing for the diopter scale I had to hunt around for some time to find a useable image, and then do a bit of exposure and contrast alteration...
  6. John A Roberts

    Swarovski SL porro models

    Summary The SL series can be considered in at least two ways: - Whether it was a success as a product - What it did for the Swarovski Optik brand As a Product As can be seen, the SL’s were a mix of the then: - unique (external shape and texture, materials and construction) - novel (combining...
  7. John A Roberts

    Swarovski SL porro models

    IF Versions - for the French Navy There is an exception to the commercial centre focus production. Between 1987 and 1993 the French Navy (the Marine Nationale) purchased a total of 3,000 units These were a mix of 7x50 and 10x50 models, and were fitted with individual focus eyepieces (The...
  8. John A Roberts

    Swarovski SL porro models

    Optical Design As the SL series optics were those of the Habicht line, the optical performance was the same. The 2 less air-to-glass surfaces due to the cemented prisms while technically interesting, would have had only a very minor effect on the transmission of the multi-coated optics (a 2%...
  9. John A Roberts

    Swarovski SL porro models

    Metallic Components While synthetic materials were used for the great majority of the SL components, there was also the use of: - pins and screws (see the images) - along with metal rings to centre and retain the objective and eyepiece lenses - together with glue to provide additional bonding...
  10. John A Roberts

    Swarovski SL porro models

    SL Designation As I’ve noted elsewhere, the SL designation seems to stand for ‘Stossfest en Lange Lebensdauer’, which translates into English along the lines of ‘shockproof and long life’ (for the original reference see here: https://www.birdforum.net/showpost.php?p=3842195&postcount=3 ) And...
  11. John A Roberts

    Swarovski SL porro models

    The Details External Design - Shape and Size The external design was that of Werner Holbl (see the attached drawing from the site: www.clponline.it ) And since then, Holbl has been responsible for the external design of most of Swarovski Optik’s products (see the image of various binoculars...
  12. John A Roberts

    Swarovski SL porro models

    Hello All, I’m late to the party as I’ve been occupied with other things for most of the week. However, after getting my notes and thoughts sorted . . . From Swarovski Optik’s start in 1949 until the SL’s introduction, all their binocular production was metal bodied, traditionally styled...
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