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  1. Replies
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    Re: Sinar Norma Copy Stand

    This was the era when studio strobe power was absolutely required. Once the products got large, so did the strobe power needed to light them. If diffusion was applied, even more strobe power was...
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    Re: Teach me about Lens Design

    Do step drill bits go that large, think it was 57mm? Ideal way is to set up the board in a lathe and bore the hole to the size needed. Making a hole in plastic can be as difficult as aluminum.

    ...
  3. Re: Color correction filters for transparency film?

    Home processing, not even close. The New Lab had a full time Chemist to assure the E6 chemistry was consistent and reliable day after day, week after week, month after month. They used a Refema...
  4. Re: Color correction filters for transparency film?

    Go to post# 20 on this link:
    https://www.largeformatphotography.info/forum/showthread.php?155445-Easy-Testing-Used-LF-Lenses/page2&highlight=elinchrome

    IMO, trying to achieve this degree of color...
  5. Re: 360mm f4.5 Schneider Xenar to Sinar board, part 1

    Schneider Xenar from this era is one of the lesser know really good Tessar lenses. There was a time when Xenars were considered undesirable due to the Xenar being a lower contrast, optimized for...
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    Re: Teach me about Lens Design

    GOOD!

    Might be easier to make a test lens board out of heavy card board- mat board. If flat, this could be easier than 3D printing a lens board.

    Testing is the only way to really know if this...
  7. Re: Rodenstock Apo Sironar N or Apo Sironar S 150mm f/5.6

    Fine print... MTF curves calculated or actual measured per each individual lens?


    Bernice
  8. Re: Rodenstock Apo Sironar N or Apo Sironar S 150mm f/5.6

    The silent equalizer, f22.
    And there is a LOT more to trying assess the performance of any lens beyond MTF curves and all that.

    Better question, what is one trying to achieve in the finished...
  9. Re: 360mm f4.5 Schneider Xenar to Sinar board, part 1

    Yes, that is a eight inch four jaw chuck. Four jaw independent chucks are often better than a three jaw as it can be adjusted accuracy requirements of a part to be worked on. They can hold irregular...
  10. 360mm f4.5 Schneider Xenar to Sinar board, part 1

    Had this lens for a while, decided to mount it onto a Sinar lens board. eBay purchase, appears to have been used in a industrial or military application as the lens came with an unusual collar and...
  11. Re: Sinar P Front and rear standard zeros are off from each other

    Proper Sinar P 8x10 rear standard is different than the Sinar P rear standard use for 4x5 & 5x7. Yes the 8x10 frame fits and works on this rear standard, but not as stable and rigid and adjustment...
  12. Re: Sinar P Front and rear standard zeros are off from each other

    Sinar P detents are not relevant and can become a tiresome bump when camera movement is used in small increments. It is easier to set up rise-fall on a 4x5 P by de-compressing the bellows by moving...
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    Re: Teach me about Lens Design

    Image contrast is all over tonal scale in these four different images and images transmitted via web are no where near idea to "judge", but ok..

    Based on your mention of preferring the bottom...
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    Re: Teach me about Lens Design

    There is only one way to really know if any given lens-optic works for your image making, obtain it, run some very basic test, if these basic test are ok enough, use it LOTs to decided if that...
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    Re: Teach me about Lens Design

    Dan,

    This is the first time I've heard of the current fad of abusing lenses by using them in parts or etc.
    Guess this is an extension of GAS? or trying to be creative by imposing experimentation...
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    Re: Teach me about Lens Design

    Seen some prints made from glass plates dating back to about 1900 or just before 1900. These prints have quite remarkable definition, detail, contrast rendition.

    Point being optics or lenses and...
  17. Re: Sinar P Front and rear standard zeros are off from each other

    Appears to be first generation Sinar P, no issues with rise-fall. This is pretty much any 4x5 Sinar P from that era would look like. The detents are mostly less important, long as the front to rear...
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    Re: Teach me about Lens Design

    Camera is not relevant until your image goals and what lens and all related has been decided. Then the choice of camera is decide based on the lens's suitability to any camera choice.

    Back up more...
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    Re: Quarantine Pictures Any Format

    206500

    206501


    Bernice
  20. Re: Justify the acquiring of a new Linhof Technika?

    Having owned-used both 4x5 and 5x7 versions of Linhof Technika, nice but no thanks. There are better cameras available at lower cost in many ways.

    Keep in mind these began as press cameras,...
  21. Re: Kodak Ektachrome Marketing Demo color transparencies

    Curious, these would be used for examples of what a good quality color transparency would be to be shared with all who are interested.

    ~Goal being, data point of reference for those who are...
  22. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Kiyohara VK70R = 70mm, VK50R = 50mm. These "soft focus" lenses were specifically designed for 35mm film. Sort of a fad item back when new, few years ago they were mostly unknown and very low $ on...
  23. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Majority of 50_ish mm lenses for 35mm film from back in the day evolved to become variant the Double Gauss Lens Formula.

    Majority of modern f5.6 full aperture LF lenses evolved to become Plasmat...
  24. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    "Sharpness" IS over rated. There are a LOT more elements and factors to what makes an emotionally expressive print than "sharpness" alone.

    Being obsessed with sharpness alone could be the result...
  25. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Been a while since doing any of this.

    Mount the lens to be tested on the Sinar P. There is a reason for this, lenses are checked at full aperture and stopped down. Camera alignment cannot be an...
  26. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Dud lenses happen more often than folks realize. This is why reading on the web this or that lens is Absolutely Superior to all might not be fact and reality. Back in the day, any lens to be...
  27. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Relevance is completely dependent on your specific print or finished image goals. Lens alone is not the sole means to an end. There are other FAR more important factors like lighting, composition,...
  28. Re: Which of my 5 LF lenses are worth keeping or worth upgrading?

    Based on previous ownership of both the 65mm f4.5 Grandagon & 65mm f4 SW Nikor, both are plenty "sharp" with more than good enough optical performance with 4x5 sheet film.. If, the lens is stopped...
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    Re: 4x5 lenses: telephoto and portraiture

    Example of why print image goals should be the primary consideration, followed by what optics are needed to achieve these print image goals with the camera being at highest third position of the...
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    Re: Seeking the perfect monorail

    Not sure if the Sinar P rear with camera mount is needed. It is completely possible to make up something that will fit your needs better. Sinar rails have a M6 threaded stud on one end and M6 nut on...
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    Re: Seeking the perfect monorail

    Yes on the light fall off problem with trying to produce wide angle lens images from the ground glass. Aid to that problem would be to apply one of those "center" filters designed to correct for...
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    Re: Seeking the perfect monorail

    This what you're wanting to do?

    205830


    205831


    205832
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    Re: Seeking the perfect monorail

    Have all the Sinar bits to make up what could be. I'll set this up later and post an image of this set up. If this is what you're looking for, this is what is needed.


    Bernice
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    Re: Seeking the perfect monorail

    I'm going to suggest using a Sinar F2..

    "we are going to be mounting a digital cinema camera to a rig with the camera and shooting video off of the ground glass."

    ~On a Sinar, mount the video...
  35. Re: How do I achieve this look? Lens or movement?

    Lens alone will not achieve this look. Gander closely at the catchlights in the subject's eyes and consider the lighting ratio, lighting type between subject to background and color and color of the...
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    Re: Sinar Auto-Aperture Shutter

    Rear lens element does not fit into the front of the Sinar shutter? Done this many, many times works no problems.
    205788

    Basically make a collar out of aluminum to move the lens position away...
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    Re: Seeking the perfect monorail

    ~No such item as the "Perfect" Monorail camera.~

    Possible to share-describe what this project is and what the print goals are?
    Once the limit of 4.5 to 6 pounds is expected, the limits on camera...
  38. Re: Are there alternatives for Schneider Super Angulon XL 210mm to cover 11x14"?

    Got to wonder how many of these 800mm f/14 Perigraphes were made.

    Once the film size is up to 11x14, they are often contact printed, not projected. This significantly alters the requirements for...
  39. Re: Are there alternatives for Schneider Super Angulon XL 210mm to cover 11x14"?

    ~210mm Super Angulon

    ~210mm Super Symmar XL

    ~200mm Grandagon.

    ~Then it gets exotic

    Others might illuminate 11x14 stopped down, but does not have optical performance designed to cover that...
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    Re: Hello from Bay Area, CA

    Set aside the camera-lens thing for now as there are FAR more important aspects of what you're trying to achieve that needs to be sorted out.

    Go to post# 20 ...
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