Posts: 192
Threads: 61
Joined: Sep 2014
Hi Gunther,
I've got a sequence that I shot the other day that has progressive (and obvious) jumps in vignetting due to aperture ramping.
I was shooting a sunset into twilight using a Samyang 24mm f/1.4 lens, and the D750 was being ramped with DSLRDashboard (of course, shutter and ISO were being ramped too).
I started the sequence in the daytime at f/16, and finished at f/1.4. With each change of aperture from around f/4.5 to f/1.4, I can see a sudden extra vignette being added (it's not too heavy, but it is obvious), and it happens right at the 2*/3* frames (the ones with the aperture changes). This is after I smoothed out the overall exposures as usual using the HG wizard in LRT.
Here's the video, the vignettes can be seen starting just after 14 seconds:
https://vimeo.com/216328559
Any tips to avoid the problem? I had it happen on an important day to Milky Way sequence, and I "fixed" the vignette jumps with progressive radial filters that I added and edited manually in LR, but it took hours and still isn't perfect.
Cheers!
Chas
I've got a sequence that I shot the other day that has progressive (and obvious) jumps in vignetting due to aperture ramping.
I was shooting a sunset into twilight using a Samyang 24mm f/1.4 lens, and the D750 was being ramped with DSLRDashboard (of course, shutter and ISO were being ramped too).
I started the sequence in the daytime at f/16, and finished at f/1.4. With each change of aperture from around f/4.5 to f/1.4, I can see a sudden extra vignette being added (it's not too heavy, but it is obvious), and it happens right at the 2*/3* frames (the ones with the aperture changes). This is after I smoothed out the overall exposures as usual using the HG wizard in LRT.
Here's the video, the vignettes can be seen starting just after 14 seconds:
https://vimeo.com/216328559
Any tips to avoid the problem? I had it happen on an important day to Milky Way sequence, and I "fixed" the vignette jumps with progressive radial filters that I added and edited manually in LR, but it took hours and still isn't perfect.
Cheers!
Chas