FS7: 5 reasons the URSA Mini is better than the Sony FS7

Its also more and more common in the video games industry that consumers pay money for beta testing new games ;)
 
Dennis, My Ursa is definitely a pre-production model but BMD told me "it's the same as the shipping version." Only other EF lens I currently have around here is a Tokina 11-16. (Confession- I borrow or rent as needed and only have a couple of EF and Sony E lenses here at the moment).

I was shooting wide open at f/4 on the 24-105 and I'll do the same with the Tokina at f/2.8 as well as throw on some ND.

But, as I said, I won't deny there is a problem just because I can't reproduce it. BTW, I did shoot the Otus and Milvus lenses wide open and no magenta. But didn't use any ND on that shoot.
 
We do indeed live in strange times.

From a Facebook post, all F4:
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I shouldn't laugh but....

I love the 'if you THNK you have an issue' line which comes after telling people to suck it up about the vignette and magenta issues because they are just a camera's bias.


And I thought Sony were a shambles when it comes to PR.
 
I guess I won't be getting an um4.6 anytime soon. Or until they've confirmed a fix for it plus the fpn issues too.
 
"The reason there seems to be cameras that exhibit this phenomenon more than other cameras is to do with the combination of different types of lenses, different aperture or focal length, and even variances between the same model of lenses." - From BM statement above

I really like BM color science, but WOW.... basically they are saying there are numerous combination of factors that can cause magenta edging and there is no concrete solution to fixing the problem. Basically, you have to figure out which lenses work and which ones do not? That's crazy.

What's even more crazy is that someone is compiling a list on BMCuser of lenses that don't exhibit the magenta corners. That's insane and nothing that anyone should have to worry about.

Once again, no BM hate as I like the look and what they stand for, but every camera they've released so far has had a major issue. They should just come out with a pro camera - charge 2X as much but make it a robust, production worthy camera that ready for the real world and not just art projects.
 
Compiling a list of working lenses won't work because I've so far seen the same sigma 18-35 lens have different results on two different 4.6k camera's, and same with some Canon zooms.

It's an absolutely crazy problem that doesn't seem to have any logic to it whatsoever - and I'm pretty good at puzzles.

But BMD's public reply is saying it's not the sensor but instead how the light is hitting the sensor from the lens, suggests to me that it is the sensor. Of course it is the sensor - the same lens(es) work fine on all other camera's.

It's a sensor design issue from how I see it and that bit about it being caused by lenses which are not tele centric means their sensor can't accept highly angled light from lenses. This is bad sensor design. Sony, Canon, etc.. put a lot of tech to make sure image quality is there when light is angled. i.e. I suppose angle of light will vary on many factors from focal length, lens design, lens aperture, etc..

Yeah 100% agreed no hate for BMD at all, I was on a list to buy one and I own some of their stuff so man I just can't understand how they went ahead with something like this irregardless. Magenta cornering was reported last year and people crucified the guy who spotted it in beta test footage.

Baffling baffling baffling.
 
Wide leicas and rangefinder glass are notorious for causing issues on all manner of cameras.

BM are talking crap here. Two identical cameras and Two identical lenses and one has it and one doesn't. On what planet does that not point to a QC/Manufacturing defect on some cameras?

Expect a couple of months of this before the tide of evidence is huge and they have to issue a statement/recall/firmware/release of Ursa Mini 5.6k.
 
Crap is indeed correct.

I was honestly stoked about the mini 4.6K. I knew it might have some compromise somewhere like a plastic feel, look ugly, or maybe a bad rolling shutter… but this sensor optics thing is in a whole other league of it's own.

Anyway, this will be my last post on the matter and this thread. It really doesn't matter anymore.

cheers matey


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It's a bit disingenuous of BM to phrase it like that. I mean this can be mitigated with better sensor design. Clearly Sony have been through this, Leica have too and maybe the other manufacturers as well, but more privately.

I could stick a Leica lens on my old APS-C Nex and get magenta corners and the same lens on the FS700 APS-C sensor doesn't show it. Some lenses have been redesigned for these sensors too (Voightlander have). The A7 series has been through changes.

However, and this is a big one. The EF mount is NOT right next to the sensor. it's 40 odd mm away from it. The emount is right next to it. So we should see huge issues with emount compared to EF but don't (sensor design?). And when was the last time someone on a C300 saw this?

To be honest that PL mount version would show it even worse if this was the case. So i don't know if there are any PL mount users seeing it.

IMHO i suspect it's a design issue. Either with the mount (and light reflections) or actually the sensor itself.

I think the crowdsourced tests are the way to go. Just keep a balanced perspective on the results. A lot of cameras will show this as we know, the question is to what degree. The BM stuff seems really quite bad by comparison, to the point where it may make shots unusable.

There was a guy on the BMC lists suggesting shooting a plate against white with magenta. You could then subtract that frame from your footage, that would probably work quite well.

cheers
Paul
 
I think the fascination with BM is that you're getting a free lunch. When it works, it's great because the image is nice. But as everyone found out again x 4, there is no free lunch.
 
Thats a great way to put it, which is why when the Raven was announced I instantly knew where I would be putting my money. And I owned a pocket cam it never failed me and produced great images i will prob still own a BMD cam as a backup/speciality cam. But I can't trust them as my workhorse
 
This reminds me of the time that while out of town I had two (not one, but two) tires go spontaneously flat. They were relatively new Goodyear tires. They were replaced under warranty. I complained to Goodyear and was told: "The depletion of the ozone layer of the atmosphere causes deterioration of the side walls of steel-belted radial tires." That's closely akin to "how the light hits the sensor through a non-telecentric lens."

I guess my Tokina 11-16 and Canon 24-105 don't exhibit the problem.

This is about the wackiest thing i've ever heard.

Ned Soltz
 
Magenta corners.
My first Sigma 18-35mm Nikon mount had significant dark/magenta corners on just the left side.
I sent it back and the new one is fine.
Had some older Tokina manual primes that went magenta in all the corners at wide apertures.

Based on my experience there is no way I will rule out that vignetting and color shift absolutely CAN come from the lens.

I suspect the current issue is more of a "combination effect". I.e., the Sensor is only just at the verge of injecting these kinds of artifacts, and paired with the right "wrong" lens you get the perfect storm and the artifacts come rushing in.
 
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