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Type: Posts; User: Jacek Zakowicz

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    Looks like we are back to the middle ages- non...

    Looks like we are back to the middle ages- non locking mount and twin rotating polarizer ND. You guys make it so easy for the manufacturers and dealers...
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    11,217

    I just can't conceive a "circuit" if the negative...

    I just can't conceive a "circuit" if the negative battery terminal is hanging in the air- there is no circuit- plain and simple circuit is open. It's like voltage wasn't there until you connect the...
  3. It looks like the USD is heading for a cliff,...

    It looks like the USD is heading for a cliff, pretty quickly as the government and fed has accelerated the money generating pace. In the mean time they will collect he wealth accumulated by the...
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    Unfortunately this is the reality check on film...

    Unfortunately this is the reality check on film sets. Camera manufacturers know that for the most part...
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    If it is a ground loop you need to wait for the...

    If it is a ground loop you need to wait for the camera to power up before connecting the video. Usually during the power up sequence the current spike gets through the common ground for video and...
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    I don't think cables would prevent it unless they...

    I don't think cables would prevent it unless they are a very high resistance and burn up upon power spike. Typical video cables are 75ohms- that will not prevent a power spike going through SDI..
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    isn't it the age old SDI problem with the ground...

    isn't it the age old SDI problem with the ground loop?
  8. you would need a very big front adapter for that....

    you would need a very big front adapter for that. As far as the expander, it works the opposite way- it makes the lens longer.... good try though...
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    Most "cine" extenders out there are rehoused (for...

    Most "cine" extenders out there are rehoused (for PL mount) still camera optics, Century and Optex are Nikon units AFAIK. IBE is most likely a ground up design and I'm not sure about TLS, not...
  10. Now that's a looney if I have ever seen one....

    Now that's a looney if I have ever seen one....
  11. Apparently the aircraft carriers are defenseless...

    Apparently the aircraft carriers are defenseless against the new generation of small rockets so they have to stay too far from the war zones to be effective. Same as tanks- the Marines are...
  12. This is a very specific and very technical...

    This is a very specific and very technical subject for a film student. Seems more of an engineering project for an (optical) engineering degree. There is a lot of math and physics involved to analyze...
  13. But why insist on vintage lenses if one does not...

    But why insist on vintage lenses if one does not want distortion? Why not just use contemporary lenses? It makes no sense...
  14. It doesn't really matter as long as the field of...

    It doesn't really matter as long as the field of view, distance are the same. and the stop compensated.
    S35 standard on film is 18x24. FF is 24x36. The diagonals are 31 and 44. A standard...
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    Let me join the choir. You are a tireless head...

    Let me join the choir. You are a tireless head master keeping us kids on track. Thank you !!!
  16. Of course it looks more telephoto. Apples to...

    Of course it looks more telephoto. Apples to oranges. Either compare 25mm on lf to 18mm MP on S35 or compare 35mm on lf to 25mm MP on S35. At the same distance. I thought we had that down....
    with 1...
  17. and vice versa- 1.4 is the f-stop. also, to be...

    and vice versa- 1.4 is the f-stop.
    also, to be clear- that calculation was just an example of a stop compensation for an FF(44) lens at f1.4 (hence the 1.4x) to equiva-lens for S35 (31). Just to...
  18. Of course, but he could as well shoot with 18mm...

    Of course, but he could as well shoot with 18mm MP , very little distortion
    funny- here it is https://www.youtube.com/watch?v=WsTYCiLpq7c
  19. He is absolutely a very accomplished pro. He made...

    He is absolutely a very accomplished pro. He made a creative choice that fit the story. Orson Welles and Gregg Toland also made such choice in Citizen Kane. It happened to be deep focus..
    Arguably...
  20. The real cinematographers position the aperture...

    The real cinematographers position the aperture where the story calls for- not at the widest possible opening. That's called a creative choice...
  21. That is incorrect. It has been debunked many...

    That is incorrect. It has been debunked many times. If the object distance is the same the geometric distortion is the same, optical design notwithstanding. Simple geometry
  22. Multiply the f number by the filmback ratio. i.e...

    Multiply the f number by the filmback ratio. i.e 1.4x (31/44)=0.986
  23. If You can prove that the DOF formula has an...

    If You can prove that the DOF formula has an error that's a big deal. You should let the optical designers know. This formula has been used in lens design for a long time so correcting it would make...
  24. 1. Unless one uses the Otus FF lenses are not...

    1. Unless one uses the Otus FF lenses are not great performers at1.4 either
    2. you can use speed booster to get the very same lens work the very same way on S35 sensor
    3. I'm sorry but it seems...
  25. My guess is that would depend on the GG grain....

    My guess is that would depend on the GG grain. Why does it matter?
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