Sharpness On Wide Lenses

[donovangreene@mac.com]

I own a Scarlet X and I've noticed that my footage is soft when using a Zeiss ZF 25mm lens when my subject is more than about 40 feet away. My camera is set to 4K HD, I've tried the lens both wide open at f/2 and also at f/8, and the background is never quite sharp. Closer objects are fine. The image gets much less sharp at 3K and 2K.

Could this be a backfocus issue or just a problem of using Full Frame Glass on a S35 sensor.

I remember the Red One being soft in 2K mode with an 18mm Master Prime when it was wide open as a result of the glass being punched in on, and wide lenses having low resolution to begin with.

My 35mm lens is the same.

Any help is much appreciated.

 

[Pawel Achtel]

All Master Primes surpass the sensor's Nyquist frquency limit at all apertures until they are diffraction limited. Hope it helps.

 

[Ben Scott]

Are you using the nikon mount or EF adapters? Are they stopping infinity focus?

 

[Dan Rosario]

I have the same issue.

 

[Stephen Williams]

The FFD is too long, get your longest lens wide open, look at the moon & adjust the back focus . A tree a long way away would also work!

 

[Shane Kelly]

check your back focus. Measure 5 ft to the sensor plane ( there's a symbol for it above the R of RED on the ssd side of the camera). Does your lens read 5ft? If not, adjust your backfocus.

 

[Donovan Greene]

I am using the Canon Mount with a Nikon adaptor. I adjusted the backfocus with my widest lens, but it still looks a bit soft at 100 percent. Will try with my longest lens now. Thanks for the advice.