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Rawlite OLPF for Ursa Mini Pro


Geoff Boyle
 

I had a great visitor today, Hans Hijmering the man behind the Rawlite OLPF.

 

He came to CML HQ and swapped out the standard filter for his OLPF + IR. It was a surprisingly fast and easy operation. The kit that he is selling includes everything you need including the Torx screwdriver. You need to add a spacer under the electronic connector and a shim to compensate for the new filter.

 

We shot both a Kodak Grey Scale and an AbelCine resolution chart before and after the change.

 

We then loaded it into Resolve and checked on a 4K monitor.

 

I corrected the grade with a simple offset in ACEScct from shot with the original filter and stored the grade. I then applied it to the shot with the new OLPF. As I had already been told it needed a minus 10 green adjustment and then everything matched.

 

There was a very small difference in the resolution in the finest section of the AbelCine res chart, but it was more a reduction in contrast than a loss of resolution. I tried adding a tiny amount of high frequency sharpening, and I mean tiny, and the difference disappeared.

 

I’m going to shoot a series of exterior tests when the weather allows, we have heavy overcast and snow now. I want to re-shoot the windmill shot that I did for IBC in sunshine. I had aliasing issues on a wooden building in the background and it will make a good real-world comparison.

 

I’m still thinking about an IR test 😊

 

Well worth a look http://rawlite.com/olpf-for-blackmagic-ursa-mini-pro-4-6k/

 

 

cheers
Geoff Boyle NSC
EU based cinematographer
+31 637155076

www.gboyle.nl

www.cinematography.net

 

 


Geoff Boyle
 

I’ve just uploaded with and without frame grabs, 4K 16bit DPX files that should download when you click on these links…

 

https://cmltests.net/Images/New_OLPF.cin

 

https://cmltests.net/Images/Old.cin

 

I’ve added the minus 10 green to the Rawlite image but there are no other tweaks between the images.

 

 

cheers
Geoff Boyle NSC
EU based cinematographer
+31 637155076

www.gboyle.nl

www.cinematography.net

 

 


John Brawley
 



On Jan 23, 2019, at 9:54 AM, Geoff Boyle <geoff@...> wrote:

I had a great visitor today, Hans Hijmering the man behind the Rawlite OLPF.
 

I’m going to shoot a series of exterior tests when the weather allows, we have heavy overcast and snow now. I want to re-shoot the windmill shot that I did for IBC in sunshine. I had aliasing issues on a wooden building in the background and it will make a good real-world comparison.
 

Hi Geoff,

I would also endorse this OLPF for the Blackmagic Ursa cameras.  Its a very minimal and subtle difference in terms of resolution difference in my experience. 

 Even when you window for high speed there’s very little hit to the resolution. With other cameras that have more aggressive OLPF's, the windowed frame rates always turn very mushy very quickly in my view.  The windowed resolution seems to give a false sense of what the camera is actually recording out front.

The biggest difference I notice though was IR.  Under (real) tungsten lighting everything is so much more consistent and easier to balance in the grade.  Previously, Blackmagic cameras have always struggled under tungsten for me.

JB
 - No affiliation other than the discount I got for buying five of them ;-)

John Brawley
Atlanta Georgia
DP - The Resident Season 2