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Wonder if anyone tried 16mm capture at 24FPS using a high end DSLR. Obviously the audio would have to be captured separately and combined with the stills to create the final video. This would produce high quality video with no ghosting.
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Meant frame-by-frame capture. There are some high end DSLRs that can do 30+ stills with electronic shutter but I do not have one of those to test the idea. -
Not DSLR, but the mirrorless one that I srtongly swear by.
I started with the mid-tier Panasonic G7 ages ago. Works OK but ther's one design quirk - SD card slot at the buttom so it's very inconvenient to dump captured images out.
Then decided to spend my precious $500 to invest into this second had GH5 (for SD card slot placement on its side, plus some improvements here and there as well). Been using this beast for about a couple of years with literally ZERO ISSUES - couldn't be any happier!
It works extremely well to the point that I start consider buying the second GH5 to expand my work now.
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Thanks Nantawat. I assume this is not frame by frame or is it? I would need a camera that can capture video from a 16mm sound film. The film runs at 24 FPS. I already have a RPI solution that works well and captures the sound and video (not frame-by-frame) but some people do not like the ghosting effect produced by overlapping frames. So the potential solution is to grab the stills at 24 FPS, triggered by the projector. The sound can be captured by RPI. Then combine the two together.Comment
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Here is a list of cameras that can do 24 stills per second. Not sure how comprehensive the list is but the cost does add up.
https://www.quora.com/Which-cameras-...pe-of-shootingComment
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For Super8 films I would use it in frame by frame capture method as per usual, at around 2.5 fps. For 16mm films I would do frame-accurate capture at (about) 24 fps. The audio was separately captured then combined later. The result would look like this.☺️
https://youtu.be/mLsYDIjFT7w?si=Cwahuzx4SXG9vUDX
This is done by TEMPORAL OVERSAMPLING - setting the camera's frame rate to 48 fps. I had the projector's shutter blade removed, and (mechanically) "tuned" the projector's speed to darn close to exactly 24 fps. The resultant video would be "clean" captured frames interleaved with "blended" frames. The rest is just a matter of (patiently) selecting only "clean" frames in the editing program. A bit time consuming process, but still faster than frame by frame method.😎Comment
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Good input, thank you. I think I will try it with my Elmo 16CL that is synched to 24 FPS using the synchronous motor. Run my RPI rolling shutter camera at 48 FPS as you suggested and should get alternating good frames with bad frames. If the sequence is consistent can run a disseminate script.Comment
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That should be even better!
The main bottleneck in my setup is the projector's main drive motor, which is an ordinary induction-type. I can make it to run at almost (but still not quite) exactly 24 fps so the captured clip would slowly dirft back & forth throughout.
That could be fixed during edit, but still time consuming - about 3 to 7 "edits" every 20 minutes or so.
(Another screenshot form my 35mm setup, but principally the same as 16mm ones.)
Only if I can find any motor that runs at exact speed life would be much easier then.
PS: how about stepper motor? Would it work up to the needed speed - 1440 rpm?🤔Comment
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Steppers motors don't typically run that fast. I suggest a brushless sensored system with a tachometer as I showed in this post:
https://8mmforum.film-tech.com/vbb/f...9264#post99264
The ebay link in the post doesn't work, but this one should: https://www.ebay.com/itm/264229767726
It shows out of stock, but there are probably other similar ones available.
It works really well to control the speed. I've actually switched to a much more sensitive potentiometer and can control to +/-1 rpm:
https://www.amazon.com/gp/product/B07D7YH9N2
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Good input Robert. Thank you. Actually your original post came to my mind and was searching for it. So your answer came in at right time.
I actually bought the parts but never implemented it. Being swamped with the 16mm projects.
The motor and the controller is available here:
https://www.aliexpress.us/item/22518...yAdapt=glo2usa
I also ran the setup with the Elmo TRV16 with the RPI global shutter camera at 48 FPS.
Looks like it works good but the resolution is limited to 800x600 with this camera due to high FPS.
Still testing it and will post some results shortly.
BTW, Nantawat's video came out pretty awesome.
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You've just shed light on me!😃Originally posted by Robert Held View Post
Possibly this might be the last missing piece in the puzzle. Will try this route asap!Comment
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Stan: Thank you for the AliExpress link. I may need another set at some point. I look forward to seeing you try yours out 😀.
Nantawat: Great! It's been a good solution for me so far. The only caveat is that it still requires human monitoring to make small adjustments as needed. Some films run without any speed drift and some will drift about +/-6 rpm and I prefer to tweak them as they run. It seems to all depend on how well each film feeds through the gate, etc. All that said, I was getting +/- 30 rpm drifts with just a universal AC or DC motor, so it's a big improvement. The best solution would be a feedback closed loop drive system that speed adjusts on the fly, but those tend to be very expensive as they're geared toward uses in industrial automation.Comment
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It worked very well:
https://youtu.be/HmWkURHbGJQ
I have some description of the procedure in the video link above,
but I am planning to do a detailed description of the procedure tomorrow.
Thanks Nantawat and Robert.
The dos script is available here:
https://drive.google.com/drive/folde...oK?usp=sharing
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Stan, that looks really nice!Comment
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Thanks Robert. Still working on documentation...Comment
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