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johnwe

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Posts posted by johnwe

    iscorama 54 focus modification - close focus

    In: Cameras

    Posted

    I have one of the focar close up diopters - trouble is they tend to cause vignetting. sort of a pain to use too.

     

    So here's a unusual fact.

     

    I believe the previous owner had the lens serviced in NY. The front ring with the serial number has a small hole drilled into it. After using the lens for a bit the focal ring started to sort of slip. What I finally figured out what that that ring had become loose and I was turning the lens outer ring without it turning the internal focussing heliod. or something like that. eventually it got out of whack and I lost infinity focus. But I gained close focus. I eventually used a lens wrench to loosen the front ring, align stuff and get it tightened up. But what I learned is that the lens has plenty or "rack" to focus close, but it does not appear to hold the ability to do infinity focus at the same time. Hope this makes some sense.

     

    This made me think there might be a fairly simple way- maybe not exactly like the pre-36 way- but some sort of way to modify the lens for close focus.

    Raw workflow question; 5d mii

    In: Cameras

    Posted

    I have done some quick trials with RAW with 5d mark II.

     

    I have used raw2dng to create the dng sequence from the raw footage. I then modify the raw sequence with photoshop Cs6. This works well.

     

    When I go to import the sequence into AfterEffects I get the raw window popping up- here's where I am stumped. This raw editing window that comes up is an older version of raw editor, older than the one I modified the sequence with in PS. And, the footage looks way darker- like 2 stops or more under- so I am always tempted to tweak it again. It often looks over processed/corrected and grainy then, once it's in AE.

     

    When I just import it as is with no correction in the raw editor during the AE import it ends up looking better, but still too dark.

     

    How do I update the raw editor in After Effects (CS5) to match the photoshop raw editor?

     

    Am I having a color space issue or something like it? Why does the footage that looks good in PS not look good in AE?

     

    the movie file that raw2dng creates from the raw file is also very dark.

     

    thanks for any help you can offer.

     

    opening a dng file from the sequence in PS- the images look good and the exposure seems pretty right on.

     

     

     

    Testing the water for a new anamorphic design

    In: Cameras

    Posted

    thanks for the comments.  does the single focal length pose a big turn off?  

     

    -please bear in mind the key criteria is to develop a full frame friendly outcome, with possibility of using the crop modes in ML to obtain various field of views.  and for use with speed booster or not depending on fov required when using on smaller sensors.

     

    I'd prefer to see an anamorphic adapter that works with wider focal lengths. If it had to work with 3 I would pick 35mm, ~55mm, 85mm

     

    Price depends on flexibility and how it compares to others coming on the market.

     

    I prefer that it works with full frame.

     

    Would be great if it had nice flares and a good way to attach hood to prevent flare in bright sun when you want less flare. (ie make front filter standard size)

     

    Close focus without diopter would be ideal.

     

    How soon can you have it done?  :)

     

    How can I help? Would love to learn more about lens construction.

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