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  1. Omid

    New Horizons II

    I wrote an inspirational post here a few days ago but it has been removed (don't know why?) So, here I write a new one: I have been a member of Birforum since 2004. I joined just to read and participate in the binoculars discussions. I still remember the day I joined the form nearly 15 years...
  2. Omid

    Zeiss moving out of Wetzlar

    I have heard from highly credible sources that Zeiss has decided to move its sports optics operation out of Wetzlar. They will be moving the division to Oberkochen.
    • Omid
    • Thread
    • Replies: 76
    • Forum: Zeiss
  3. Omid

    Omid's Invention - Binoculars with Convergent or Divergent Field of View

    I received my patent grant on "Binocular telescope with controlled parallax" on August 29, 2017. It is US Patent Number 9,746,660 and you can read it here. This is my 8th granted patent in the field of sports optics and the only one (so far) specifically dealing with binocular vision. My other...
  4. Omid

    Omid's innovation (split from 'new Leica binocular' thread)

    I am with you here. The industry has been stagnant for decades. I have made an "actual innovation" which does produce "generous eye relief". I have told Leica about my innovation but they have not been very eager yet (?) In my design (for which I have been granted a US patent), there is no "eye...
    • Omid
    • Thread
    • Replies: 51
    • Forum: Leica
  5. Omid

    Charactristics of Reveresed Binoculars

    Charactristics of Reversed Binoculars When looking through binoculars, there exists a hypothetical pupil behind the eyepiece which is called the Exit Pupil. It appears to the viewer that all the light rays are coming out of this hypothetical pupil. This pupil is commonly located 13mm to 18mm...
  6. Omid

    Swarovski STR spotting scope, how does the reticle work?

    I am curious as to where the illuminated reticle of the Swarovski STR 80 spotting scope is located? Is it etched on a separate glass disc and placed at the focal plain of the eyepiece? Or is it etched on/attached to one surface of the erector prism assembly? :h?: Thanks!
  7. Omid

    Bioculars with diverging field of view

    I am wondering why there aren't any binoculars with diverging fields of view. When the two barrels are parallel, the field of view at long distances is practically the same as the field of view of a single barrel. With reference to the first attached figure, d is the distance between the...
  8. Omid

    Call for contributions: Collecting Evidence for Lack of Progress in Sporting Optics

    I wanted to name this thread "The feature Leica Super Ultravid HD Plus Plus" to attract more attention but I decided that a more direct headline might be good enough ;) I am an engineering scientist, a hunter and a big fan of sporting optics. I have been a member of this forum for nearly 10...
  9. Omid

    Leica Trinovid 10x50 BA

    I purchased a pair of Leica 10x50 BA binoculars a few days ago and they arrived today. Took them out for a first view near sunset and the view through them is amazing! Love em! :) The binoculars also came with a very classy hard leather case. :t: Have you guys had any experience with the 50mm...
    • Omid
    • Thread
    • Replies: 45
    • Forum: Leica
  10. Omid

    Telescope with expanded exit pupil

    Exit pupil is a key parameter of binoculars, telescopes and spotting scopes. It is also closely associated with eye relief: Exit pupil: the imaginary disk behind the eyepiece where the rays from the eyepiece converge. The observer must place his eye on this disk to be able to see the full field...
  11. Omid

    How to shift an image optically?

    I know there are some very bright minds here so I thought I would reach out to my Bird Forum friends regarding this problem I am thinking about. Assume that we use an objective lens to form an image of a distant object. We then add an erector system consisting of two relay lenses to form an...
  12. Omid

    Frequency doubling an nonlinear optics

    Frequency doubling and nonlinear optics Consider pointing a laser beam or any other light source towards a target such as a white wall 100m away. I am interested to make the spot invisible to naked eye but visible to someone who is wearing special sunglasses. I am interested in doing this...
  13. Omid

    Brightnest of scene illuminated by a moving spotlight

    Consider we have a laser pointer with a beam 1cm in diameter. We use this pointer to project the spot on a wall 100m away. Then we quickly move our hand to "scan" an area about 1m by 1m uniformly. That is, we draw a line one meter wide, then move the spot down 1cm and draw another line, and so...
  14. Omid

    Calculating image resolution

    Dear friends, I am trying to make a calculation as to how much resolution (i.e. pixel/inch) we need in the image that the objective forms at the focal plane of the eyepiece. To make the question more clear, let us consider this similar problem: We place an small LCD or OLED screen at the focal...
  15. Omid

    Micro Binoculars!

    Hello and Merry Christmas! I have been thinking about this idea and would like to share it with forum members here to see if it is practical. The idea is making a 1X (unity power) telescope using lens arrays. Lets say each lens has a 1mm diameter. In theory, it should be possible to put three...
  16. Omid

    Marketing confusion (SLC HD vs EL SV vs EDG vs Premier LX L)

    Guys, I am going to make a bold argument here regarding Swarovski bringing out a 8x42 HD SLC while it was just last year that they heralded the super duper 8.5x42 EL SV. Based on the reviews that I read on this forum it seems that these two are almost identical in performance, price and most...
  17. Omid

    Of lenses and diffractive gratings

    I know there are some very clever optics experts here in the forum so I post this question hoping we get some discussion and may be an answer. I was reading some standard text on optics (Hecht) and these question came to my mind: Q1: Imagine that a narrow beam of white light hits a diffraction...
  18. Omid

    Swarovski STS 80 Current Pricing

    Hello Gentlemen, Today, I came across a nice Swarovski STS 80 with 20-60 zoom eyepiece in an outdoor store. It's a store sample with the front lens cap missing but everything else is there and the asking price is $1500. I think that's a pretty good price for this scope! I checked eagle optics...
  19. Omid

    Green Lieca Duovid 8-12 X42

    Hello my fellow binocular aficionados! I hope you guys are having a fun Thanksgiving weekend. If you are a hard-core Leica fan, I have some great news for you! I am planning to sell some binoculars in my binocular collection and among these are the super cute Leica Duovid 8-12X42 in Hunter...
    • Omid
    • Thread
    • Replies: 5
    • Forum: Leica
  20. Omid

    Better resolution with curved prisms?

    Hello Gentlemen, Here is a question that has come to my mind and I hope those of you with a good background in theoretical optics help clarify. Background: The errecting prism system (be it porro or roof) is normally placed in the light path of the objective lens before its focus plane. The...
  21. Omid

    SHOT SHOW 2009 News

    I just came back from SHOT SHOW 2009 in Orlando, Florida. Here are some very quick observations: Leica: Nothing new in terms of binoculars. They had a few samples of their new Televid 82 spoting scopes on display. I observed that the focus did not change (as happens in other brands) when the...
  22. Omid

    Fair price for Zeiss 15x60 B/GA

    I know these are no longer made and very hard to find. A note on Company 7's website says that they sold the last batch at about $2200 a pair around 1998. What's a fair price for a new pair of these binoculars now? I have the chance to buy a pair of these (New in Box) at a local optics shop...
    • Omid
    • Thread
    • Replies: 13
    • Forum: Zeiss
  23. Omid

    Zeiss 7x45 Design Selection

    These were made in the 90s. I am looking for one in mint condition and in green color. If you know of a person or a place that has one for sale please let me know. Also, if you have ever used these binoculars I look forward to hearing your comments. Thanks
    • Omid
    • Thread
    • Replies: 10
    • Forum: Zeiss
  24. Omid

    Leica BA vs BN models

    I have seen an interesting 8x50 BA and I might consider buying them. Now, as I recall the only differene between older BA and newer BN series is the close focus ability in the BN series which is not important to me. Is there anything else to consider?
    • Omid
    • Thread
    • Replies: 3
    • Forum: Leica
  25. Omid

    EL and SLC sales figures

    I was wondering what the relative sales figures are for Swarovski SLC and EL binoculars? Does anybody know how many SLC and EL binoculars are sold in the US market annually? I am also interested to know how the high-end binocular market (price range above $1500) is divided among Zeiss, Leica...
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