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au8ust

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Posts posted by au8ust

  1. On 4/20/2022 at 8:45 AM, MrSharon said:

    hello, could anyone help me to understand the rear lens make and model. the front lens i know it is schneider Cinelux .

    and the rear lens , should i move with auto focus? 

    I believe it's an ISCO projection lens. They usually don't have an aperture control so you're gonna have to shoot wide open. You can make a simply whole grab adapter to use it with a Chinese helicoid to focus.

  2. If it's fixed at something like 4m then you will be able to focus from 4m down to very very close, unless you have a special variable diopter that has both negative and positive power adjustment.

    I'd say the best way is to modify your scope to achieve inf and lock it there. Then you can use any focuser to focus it from inf down to about 1m.

  3. There's a single focus version too, this one https://www.youtube.com/watch?v=Ab7KFtUFv8s

    Basically it's the 1.33x-40 compact with SLR Magic Rangefinder builtin, non-removable.

    Also, there are two version of each, the one with near/normal focus distance and the other one with feet scale (they call it Cine, if I recall). Optically they're the same, with just different distance marking and the one with feet scale costs more.

     

  4. What I usually do is to open the image in PS and stretch it down to 50% horizontally and the crop 50% top and bottom. That's it.

    Beware that with most anamorphic lenses, when you focus at the closest possible distance (ie. 2m), the squeezing factor maybe reduced to lower than 2x, like 1.8x or so. So if you desqueeze your image by 2 times you might find that the people in the image look fatter than they should be.

  5. On 2/23/2021 at 11:09 AM, Caleb Genheimer said:

    It’s worth noting that the new Rapido Technology FVD-35NP will allow us to shorten long scopes, reducing the squeeze factor... but also gaining angle of view.

    Somehow I don't get this. By reducing the length of the scope, I get that it would reduce some amount of the vignettes which means no sides cropping needed, thus more FOV? But then you lose 20% of 2x squeezing factor, that's from 2x to 1.6x. So how could you gain more FOV after losing 20% of the squeezing factor?

    Any explanation would be great, thank you!

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