Over crank darker then not over crank, same preset?

[Nacka]

Why is the image getting darker when I select over crank (VFR ON/50Frame in Intra100/25PN, in 720-50P mode) :shocked:

I use these presets "DIGNEG" or "NATURAL" when all settings are exactly the same as when I doe straight 25p (not over crank)?

Regards
Mikael
Sweden

 

[KevinP]

Experts will be here soon I'm sure....but isn't it just because when overcranking you are exposing each frame less.

 

[Nacka]

Thanks NewHPXuser, I think you have a point here. I wait for the “Experts” to shine in then.

 

[Luis Caffesse]

Experts will be here soon I'm sure....but isn't it just because when overcranking you are exposing each frame less.

No experts needed..... that's exactly why.

 

[KevinP]

No experts needed..... that's exactly why.

Thanks Luis - you've made me feel like I actually know something. rogar-Happy(DBG):

 

[Luis Caffesse]

Thanks Luis - you've made me feel like I actually know something. rogar-Happy(DBG):

You're now the resident overcranking exposure expert.
:thumbsup:

 

[Nacka]

Sweet, Thanks.

Just love this forum

 

[Barry_Green]

It's because you have the shutter set on "syncro scan", so the shutter speed tracks with the frame rate. If you want, you could set a fixed shutter speed (like 1/50th) and your overcrank footage would be exposed exactly the same as your normal-speed footage, but the problem there is that it'll look blurrier in motion. The Syncro Scan shutter speed gives the most filmlike motion rendition when going to overcranked footage.

 

[puredrifting]

Thanks for that Barry, I never understood that. Cool info. I shoot a lot of overcranked footage.

Dan

 

[Dino]

I use 1/60th or 1/100th shutter when doing a speed ramp during a take with my HPX2700, otherwise, if I left it in 180 degree shutter, I would see exposure changes when the frame rates changed, as Barry posted.