iPhone X 16mm film direct transfer

[Stan Jelavic]

The higher tier projectors may work. I currently do not have any of those to try in 8mm. The rolling shutters scan the sensor line by line. If there are 3 subframes (3 blade shutter) per exposure then the rolling shutter will create a dark stripe during black intervals because it does not integrate the subframes like the global shutter. In another words if some pixels go darker with the global shutter due to the black interval the next subframe will overwrite it because the global shutter integrates the pixel intensity and then reads all of them at once at the end of the frame. So in summary the global shutter is better for real time captures.

[Winbert Hutahaean]

I looked at this before and there is an issue synching the projector to the camera because of the 8mm projector speed drift. The iPhone camera uses a rolling shutter that requires precise motor speed. This is not an issue with the 16mm projectors since most of them are synched to the line 50 or 60 Hz and run at 24 FPS. Elmo ST180 may work however but I do not have one of those here to try it.

What about using more stable projector like GS series or high end projectors which has quartz feature?

But to be honest I am not sure I understand with Iphone rolling shutter what is that?

[Stan Jelavic]

I looked at this before and there is an issue synching the projector to the camera because of the 8mm projector speed drift. The iPhone camera uses a rolling shutter that requires precise motor speed. This is not an issue with the 16mm projectors since most of them are synched to the line 50 or 60 Hz and run at 24 FPS. Elmo ST180 may work however but I do not have one of those here to try it.

[Winbert Hutahaean]

Thanks Alwyn. Tested several lens combinations and this one was the best.

Can we use the same set up for 8mm. If you have time please post the result as I don't want to spend hours like frame by frame method.

Cheers,

[Stan Jelavic]

Thanks Alwyn. Tested several lens combinations and this one was the best.

[Alwyn Adkins]

Pretty sharp there, Stan. Nice.

[Stan Jelavic]

Tested resolution with the test film. It is actually very good.
https://drive.google.com/file/d/1Znm...ew?usp=sharing

[Stan Jelavic]

Tried capture without special lens using the original Elmo 16CL lens. It came out pretty good.

[Stan Jelavic]

Set the phone shutter to 72 FPS. Then adjust the ISO for required brightness. I have a 100 ohm potentiometer in series with the LED and use it to turn the brightness down if there is a bright spot in the center of the screen. There is no flicker and almost ghosting free.

[Alwyn Adkins]

Thanks Stan, what are the details on the shutter speed for the phone? Does the MoviePro app stop flickering?

[Stan Jelavic]

Haha like the comments. Here is some more info:
- projector Elmo 16CL running 24FPS
- used MoviePro app. Operating instructions available here https://github.com/vintagefilmograph...16CL_to_iPhone
- used the HDMI dongle https://www.amazon.com/dp/B0BVM84Z6H with audio input
- Modified the projector by adding an LED light and charger, brought audio out. TRRS cable and attenuator also required.
- Did a horizontal flip (around horizontal axis) in the app itself but the video needs to be flipped vertically in the post (have not done any postprocessing)
Not bad results. I also developed a macro lens for the iPhone and will run the resolution tests.
This video is without the macro lens.
This can be a solution for people that do not want to spend a bundle of money and already have an iPhone.

[Scot McCauley]

That is a USB-C breakout adaptor that allows you to connect and HDMI monitor or audio speakers to your phone. The white cable going off to the side is a power supply and the coiled cable is his audio from the projector. It is reversed because he is filming directly into the projector. Remember a projector lens inverts the image. It looks really good considering it was shot on an Evil Fruit Empire Product. lol

[Joerg Polzfusz]

The white box is most likely an adapter to record audio from the projector while simultaneously recharging the iPhone:
https://www.walmart.com/ip/Apple-MFi...-Sup/948135106
(The one from Walmart only has got a combined socket for audio in/out - the one used by Stan most likely has separated sockets.)

[Chip Gelmini]

I don't understand why it's a reverse image or mirror image on the second video

[Alwyn Adkins]

Not bad, not bad at all!

Now for the juicy stuff:

Stock iphone camera app?

iphone shutter speed?

Any particular iphone modes?

What's the white box hanging off the iphone?

Projector running at 24fps?