Optar Illumina S16 16mm Test

[Denny Smith]

Howie, that looks about right, with my tests of the 16and 25mm Illumina on the Olympus Pen F, to see the projected image circle. The 25mm comes close to covering the BMCC, while the 8-16mm have enough coverage for BM S16 sensor cameras. The chart however, looks like it is showing S16 16:9 projected/scanned gate size, vs the camera full gate, which is a little larger than the Piocket camera BM S16 sensor size.
Thanks for the post.
Cheers

[Denny Smith]

I just found a list of projected image circle of the Zeiss Super Speeds, and the 16mm lens has a image circle of 19mm, And the 25mm should be around the same or a little larger. The BMCC sensor diagonal is 18mm, so while the SS 16mm will cover the sensor, the edges will be soft as the image in the 15-19mm projected area was not intended to be inside the film gate/plane area, so distortion will also be increased at the edges.

Zeiss keeps the intended gate area sharp edge to edge, by having the lens project a larger image circle than needed, so,the soft edges were cropped off by the gate and now sensor edge, hitting the sweet spot of the lens' projected image.

The Optar/Illumina is 15.8/16mm so it will vignette on the BMCC 18mm diagonal sensor. That said if you crop,to a wider aspect ratio than 16:9, it would work.
Cheers

Also, has anyone tested the Optars on the BMCC?

I've read that they should cover from the 16mm up but that the converge is not as good as on the Zeiss Superspeeds.

[shijan]

The bad thing. I find that focusing with wide iris values is uneven. If the right part of the image is in focus the left is slightly out of the focus, and vice versa. If i flip the lens in the mount the uneven focusing is also flips, so it is not a camera mount or lens adapter. Tried to attach rear lens part without shims but got the same result. Have no idea how to fix it at this time. Sending the lens back to factory is kind of too complicated in my situation

[lluiscl]

The bad thing. I find that focusing with wide iris values is uneven. If the right part of the image is in focus the left is slightly out of the focus, and vice versa. If i flip the lens in the mount the uneven focusing is also flips, so it is not a camera mount or lens adapter. Tried to attach rear lens part without shims but got the same result. Have no idea how to fix it at this time. Sending the lens back to factory is kind of too complicated in my situation

I have seen this problem in some zooms... the culprit always was in the central/moving optics (usually cured when you close iris).
Probably some glass element in not in the good place... or some body parts are not perfectly machined. Control quality??
Certainly it don't happen with my 8mm.
As a quick fix you can try to shim only one side, trying to compensate...

[shijan]

Yeah, those are the lenses that Optica Elite released after the JSC Optica iteration, kind of a MKIII but I don't know that they were ever referred to as such. That's the line between the illuminas and the currrent MKIV lenses.

Here's a graphic that I took from the ruscamera ebay site that shows the coverage for their lenses if anyone is interested.

And here is also archived page with tech specs of those lenses https://web.archive.org/web/20160402...nc.com/16.html

[DanKanes]

Regarding the not flat field of the lens - that is pretty much an assembly problem with some of the lenses. Lumatech usa / Charles Pickel should be able to get you squared away. They serviced my set (now sold) - worth every penny.

[Denny Smith]

Yes, getting these older lenses serviced (even new in the box old stock) makes all the difference in using them, getting smooth operation back and focus accuracy.
Cheers

[kroaton]

Cm anyone put up some Bmpcc footage with the 8mm ?
I'm especially curios with what it looks like wide open.

[Roberto]

this gorgeous one is shot with the 9.5
https://vimeo.com/139896168
and Aleksey Khruslov had a full set of them (if I remember it right), so I guess there must be some shots with the 8mm
https://vimeo.com/141613737

wasn't there a member from russia who stated he could get them cheaper for us boarders?

[kroaton]

Danny, do you still have any pictures taken with the Optars and the Pen F?

I'm thinking of getting an 8-16mm lens set for my BMPCC and BMCC, but I can't tell if a clean 2.35/2.40 extract would be possible on the BMCC without seeing how much the lenses project past specification.
I made some rough drawings based on the BMCC sensor size and the lens circle sizes provided by Lumatech, and it looks like the corner coverage/sharpeness depends entirely on lens overprojection.

http://imgur.com/a/AcfzY

[shijan]

Finally done test of my focus shift problem. OPTAR 16mm @T1.3 and @Т2 and vintage OKS3-15-1 @ T2 for compare. Lens located about 50cm to the chart. DIY printed chart is A3 size. Lines smaller than 12 are printed with shifts and random mess so don't perceive it as perfect test example.
Also from these tests you can see how Mosaic OLPF works.
Videos and still frames can be found here https://www.dropbox.com/sh/smc9ocrvm...XWLfZXoMa?dl=0

[Truemotion]

May be pl/arri b adapter problem. If this is not seen on other lenses than this lens is defect

[shijan]

May be pl/arri b adapter problem. If this is not seen on other lenses than this lens is defect

it can't be adapter. i measure it from all sides with precise tools and it is perfectly uniform. The lens sits in the adapter without any shifts. Also when i flip the lens to 180 degree in the adapter the mismatched focus effect also flips to another side.

[Nomad]

Then the lens is de-centered.

[Denny Smith]

Yes Kroaton, I do, send me a PM with your email address and I can send them to you. I shot the 16mm, and 25mm Illumina on the PenF, along with the Zeiss 9.5 and 12mm for comparison. The Illumina projected image was larger. The Illimina 16mm and up will cover the BMCC with over projection (the 16mm useable projection, will be just slightly larger around .5mm than the sensor).
Cheers

Danny, do you still have any pictures taken with the Optars and the Pen F?

I'm thinking of getting an 8-16mm lens set for my BMPCC and BMCC, but I can't tell if a clean 2.35/2.40 extract would be possible on the BMCC without seeing how much the lenses project past specification.
I made some rough drawings based on the BMCC sensor size and the lens circle sizes provided by Lumatech, and it looks like the corner coverage/sharpeness depends entirely on lens overprojection.

http://imgur.com/a/AcfzY