Atlas Orion - is that distortion normal ??

[Emilian Dechev]

Hello RED users,

I am a first time user of 2X Anamorphics. I have waited for the Atlas Orion B-Set for more than 9 months and was very excited when it finally came in.

Everyone on set was also very excited, until the actress saw the monitor and asked "why is my face so distorted?"

I didn't know what to say and just answered "that's because of the anamorphic effect, dont worry".

So does anyone know if that is really normal, or did I got bad lens ??
OMG, and if it is normal, why is the distortion direction different across the lens? Its like one lens goes to the left, the other lens goes to the right, etc...


Shot on the Ursa Mini G2 at the anamorphic mode 3072x2560 and de-squeezed in Davinci Resolve at 3840x1600 (2.40:1)


https://youtu.be/9HlMYPdbKaI

 

[Björn Benckert]

I got a set of orions and mine are perfectly aligned.

Likely your Pl mount on your camera is not so accurate. Simply put if the anamorphic element is not aligned with the sensor you get this effect. So if the little stud in the pl mount is to small then you get some play where the lens can twist in the mount. Some people use anas with EF mounts... don't. Those are simply not built for it and tend to have a lot of play in the mounts.

To rescue the footage you need to create a setup where you spin the material around the roll axis before you do the squeeze doing so will demand that you zoom into the material quite a bit to get it straight. So yes better have a good mount and make sure the lenses are have their elements perfectly aligned before going to shoot something important.

I doubt the lens where off when leaving the factory. More likely it's the mount of the camera, or someone swapped mounts on the lenes without making sure they remained aligned.

Go to a lens doctor kind of guy and he can tell you what's faulty within minutes and likely fix it within an hour or so.

 

[Emilian Dechev]

Thanks for the suggestion, yes the lens mounts were swapped to EF before the shoot.
So it is very likely that the adapters were not aligned during the swap and the lens are perfectly fine.
I will check on that later

 

[john w wheeler]

I have a PL mount but it definitely does not look like that on my Dragon X or Monstro

 

[Emilian Dechev]

Yes there seems to be a bit of play around the screws on the EF mount. These could possible be causing the rotational misaligment. Will test with PL tomorrow.

 

[Dan Kanes]

Indeed ATLAS EF mounts are slotted for azimuth adjustment because not all EF mount cameras have the same base azimuth, this will allow you to adjust and verify per camera which you are using if needed.

We will be doing some good training videos later this year about this subject matter.

Glad we were able to determine the root cause of azimuth misalignment !

We are here for you if you need further help !

 

[Emilian Dechev]

Hello everyone, I fixed the issue.

Indeed, it was a case of "azimuth misalignment" which is a result of the placement of the mount screws.

Since I wrongly assumed there was something bad with the optics, I deleted that video, and have to apologize to Atlas for the trouble.

Here is the new video, showing different positions of mount screws, causing different kinds of misaligment.

At the end, even when perfectly slotted, the inherent play of the EF mount may cause just a little bit of a skew.

All lenses work fine now, I can relax and be glad having them

https://youtu.be/pDRUAEW3dhI

 

[Dan Kanes]

No need to apologize !

We are here for you buddy !

Glad you were able to get it sorted.

-dan