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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Speedbooster tests

So here we are with the custom mount. (Nikon fit)

The mount holds the lens mount and speedbooster element and OLPF/IR, so its a quick swap out.
 

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Demetri Zuev said:
What effects does it introduce, John?
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Twice the light minus some and twice the width of horisontal view.


Patrick Tresch said:
Even if it could be possible to make a Speedbooster/OLPF combo in the space of the OLPF cavity, it's main potential target (4k's RAVEN) wouldn't allow to change the OLPF wich is to bad. I would have jumped on this option otherwise.

Interesting testing.

Pat
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I don't only see it as a raven thing. Imagine speedbosted weapon 8k... that would very grand epic if you ask me. also the increased speed is not a bad thing for night shoots and speed boasters also strange as it sounds can get a sharper picture out of a given lens. So there is more things to it than just to give raven the same coverage as a larger format camera.
 
James Miller 72 said:
So here we are with the custom mount. (Nikon fit)

The mount holds the lens mount and speedbooster element and OLPF/IR, so its a quick swap out.
Click to expand...

The plexi mount, very cool :) With the Otus that is a mad nice combo.
 
John Marchant said:
Yes, its ironic really that the best target (raven) for this concept is not applicable... you'd be better off starting from scratch with an EF mount full frame to aps-c block.
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Yeah, true. Raven might be the best target here, especially with that BMPCC-Booster-optics in mind, but Scarlet and EPIC/Weapon-6k aren't that far behind. If it can be done, i see a lot of potential on those cameras for it. 5k/6k with a VV-like FOV? ;)

Hell even on a 8k-VV-Weapon it would be awesome. But that probably needs new optics, specifically calculated to reduce the image-circle of medium-format glass to the 8k-sensor.

A real EF-to-EF-speedbooster could be a very interesting product, not just for RED(RAVEN)-shooters. But it would be still a nieche-thing and compared to trying squeezing some glass between sensor and lens, without changing the flange distance, way more difficult to make. Are there any optics out there that do exactly this?

In a related zone we have a design for a 2x Anamorphic OLPF that's shelved currently. It was intended for Dragon, but the OLPF frame is not an easy area to work with optically due to the space limitations, and we figured that anything like this was best left for the Weapon generation which gives us some more space and flexibility.
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You dropped a bomb here. Anamorphic OLPF! Wow! This is huge, i don't know where to start. :D AWESOME!
 
I've been waiting a long time for something like this. Good to see the nay-sayers get silent.

Maik Müller said:
You dropped a bomb here. Anamorphic OLPF! Wow! This is huge, i don't know where to start. :D AWESOME!
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That would be revolutionary.
 
Aha. A man after my own heart, someone who cannot let best be. A while back, I modded a BMPCC - Nikon speedbooster for the SI2K. This was a simpler exercise than your adventure in that all I had to do was machne up a thin adaptor disk for the rear of the Nikon Speedbooster and skim a little off the Speedbooster body itself.

Your project might have some real legs when it comes to medium format lenses. - Much respect.

As for anamorphic focal reducers. Have you thought of giving Matthew Duclos a call or an email?
 
Nice going, James.
Very interesting...
 
I want one!

James, as you figure this out, please please please setup a group buy.

I'd want a canon mount version for Epic-D

Jamon Lewis said:
Sell me one of these set ups!!
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On a side note Q, I noticed you're using the rear XL battery mount...

How is your runtime/recharge/experience vs say 95WH Vmount Bats
 
James Miller 72 said:
So here we are with the custom mount. (Nikon fit)

The mount holds the lens mount and speedbooster element and OLPF/IR, so its a quick swap out.
Click to expand...

Was that 3D printed? Looks really good (other than the potential light transmission, which can be fixed easily). You think there'd be a way for it to be possible without removing the OLPF (for MX users, RAVEN users, and/or to be a turn-key solution)?

In any case, it's very cool; the footage you posted yesterday was awesome... Would love a .r3d full-res frame if possible (as downscaling always looks better).
 
Mathias Erichsen said:
Wow! :) This looks like a fantastic project.
Really hope this will turn out to be a product at some point.. I`d pay for something like this.
Click to expand...

Everybody would pay for something like that.. Again, that's exactly what Raven needs..

@James, did Jarred or someone at Red contact you about this incredible feature ?
 
Been trying some more of my old stash of OLPF/IR filters on the Speedbooster mount. Had to shape the corners of the filters to fit into the adapter. Circular would be a lot better for me, one I am using at the moment is a 2 ply with same colour characteristics as the RED lowlight OLPF. But its thinner than the RED lowlight OLPF of 4 ply, 3 same size and one 1/4 of the rest. Not sure if they are all birefringent or one is IR cut glass or just a coating on the RED one.

Whats nice is 3k gives a very usable image. I'll do some tests down to 2k on sticks showing the resolutions, with some distant brickwork thrown in for any aliasing.
 

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At 2K, you may find the BMPCC optic is more viable. When registered correctly on the SI2K sensor, the rearmost surface of the BMPCC Speedbooster optical cell is about 12.0mm rearwards of the IMS-Mount flange face which is 19mm from focal plane. That comes out as 7mm clearance from the focal plane. The outermost diameter of the rear of the optical cell is 24.5mm but it widens out to 25.3mm, then to approximately 34.0mm at the threaded portion of the cell.

I regret I cannot find my original working drawing with all the dimensions.

The M4/3 Mount flange face is 19.25mm. It therefore was a relatively easy mod to remount the entire BMPCC Speedbooster for Nikon to the SI2K. This would also be valid for the IMS-modified Ikonoskop digital A-Cam and maybe for the older RED Ones with the P+S Technik IMS-1 mount kit. If there is a Micro 4/3 mount for the RED One, then with either a Nikon or Canon EF BMPCC Speedbooster you would be home free with just a clash check to make sure the optics don't touch the sensor.

I am not so sure there would not be a vignette on the older M sensor but at a 2K crop, I think the result should be good.

This clip was a rough test I did with the Speedbooster and Nikon f1.4 lens and Super16mm lens without Speedbooster, lit to keep the lenses' iris setting within their respective sweet spots.



This clip was a selection of Nikon F-Mount lenses. I had forgotten to take the ND filters so had to up the shutter speed and close the irises up into the diffraction zone. There were also some shots with an anamorphic adaptor. Some Nikon mount lenses work better than others with the BMPCC Speedbooster. The 35mm f1.4 seemed to be less sharp edge-to-edge than the others. IN the string of shots of the tall ship, the lenses were 50mm, 40mm, 35mm, 14mm, 50-500m zoom. Point of focus was on the hull where the front mooring line comes out except for the zoom which was on the rigging.




Pixels on the SI2K are 5 microns. The image width is 2048. I believe the active area on the image sensor on the SI2K at 2K is slightly smaller than the BMPCC.

The projected image diameter seems to be about 20mm with f1.4 Nikons via the BMPCC Speedbooster. How sharp the corners are I cannot advise as it was just an eyematch using a shop bag as a translucent screen and a vernier to measure the approx image circle.

Hope this helps.
 
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Here is video version all scaled to 1080 height to conform to lowest resolution. (post sharpness added)
https://vimeo.com/142510310


HD download - https://player.vimeo.com/external/142510310.source.mp4?profile_id=0&download=1


Also available to download is the 4k FF R3D file here:

http://we.tl/GH6DCph66z


Image pulls, processed.


Jpeg download link:
http://we.tl/rx2af9fYOG


Tiff download link:
http://we.tl/9hnRADa6oU




2k FF / RED_FRAME_SB_OLPF2_001.JPG
3k FF / RED_FRAME_SB_OLPF2_002.JPG
4k FF / RED_FRAME_SB_OLPF2_003.JPG
5k FF / RED_FRAME_SB_OLPF2_004.JPG
6k FF / RED_FRAME_SB_OLPF2_005.JPG
3k 4:1 333fps / RED_FRAME_SB_OLPF2_006.JPG




4k as planned is the sweet spot for the speed booster, really nice detail. 5k is just about FF on a 35mm, but you can distortion coming in from the corners. 6k is not usable due to corner distortions.
3k is very nice too though, lots of detail. 2k ok just not great being at 1:1 pixel. Aliasing is present at 2k and 3k and would of course be there all the way up but that was to be expected with this reduce OLPF, also the fact I post sharpened to see where it would show. But 4k for 2k its not bad. Will do a test with factory OLPF for comparison. Check the 4k R3D for reference though.


Going to try and get the speedbooster ultra for the Sony E series to fit, its a bigger element and will need the casing of the element machined down but this should give bigger coverage. Also I could get a cleaner 5k frame by placing the speedbooster element closer to the sensor, but I will have to redesign the lens mount to get the right flange.
 
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