FS7: FS7 + Optimo Style 16-42 = Vignette?

A

anothermember

Active member
Standard apology if this has been covered elsewhere; if so please direct me to it, I couldn't find it.

I've got an Optimo Style 16-40 on an FS7 and when zooming wider than 20mm the lens vignettes. Any thoughts why this is? Help would be greatly appreciated. Thank you!
 
Hi Rod,
Are you using a 16x9 format (HD or UHD) or a wider format (2K or 4K)? The Abel-Cine Field of View comparator shows Super35 frame to be 24.9mm x 14mm. To get the slightly wider 4K or 2K format, Sony adds extra photosites on either side of the Super35 frame. I'm not sure, but this might be extending beyond the range of the Optimo Style 16-40.

Also, are you using a filter on the front of the lens? 16mm is quite wide for a Super35 format, so the edges of a thick filter might be getting into the field of view.
 
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We're shooting 4k, but I found out the problem. The adapter I'm using is the Metabones Ultra Speedbooster which is to blame. Apparently the non-speedbooster adapters work no problem, but the speedbooster changes the flange depth too much. Thanks for the help!
 
anothermember said:
We're shooting 4k, but I found out the problem. The adapter I'm using is the Metabones Ultra Speedbooster which is to blame. Apparently the non-speedbooster adapters work no problem, but the speedbooster changes the flange depth too much. Thanks for the help!
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It has nothing to do with the flange depth.

The speed booster is a focal reducer. It is designed for use with 135 format lenses, not S35. The flange depth is exactly the same as other non-speedbooster adapters.

Many S35 zooms cover a wider image circle on the longer end of their range, but vignette wider.
 
Liam Hall said:
It has nothing to do with the flange depth.

The speed booster is a focal reducer. It is designed for use with 135 format lenses, not S35. The flange depth is exactly the same as other non-speedbooster adapters.

Many S35 zooms cover a wider image circle on the longer end of their range, but vignette wider.
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Thanks for the clarification. I was actually getting a couple explanations, one was flange depth and the other was that the speedbooster ultra has a reducing element (focal reducer?) inside which other non "booster" adapters do not have, which was to blame. What is a 135 format lens?
 
anothermember said:
Thanks for the clarification. I was actually getting a couple explanations, one was flange depth and the other was that the speedbooster ultra has a reducing element (focal reducer?) inside which other non "booster" adapters do not have, which was to blame. What is a 135 format lens?
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135 is conventional 35mm stills camera film (i.e. "full frame" film). It has a much larger image circle than S35mm, and is the ideal format (of lens coverage) for speedbooster adapters.

It's great that the Optimo will work down to 20mm anyway though, with the speedbooster that's still a wider effective FoV than 16mm without a speedbooster, and you get the benefit of making the lens an effective T/2 zoom(!). That's really cool.
 
anothermember said:
We're shooting 4k, but I found out the problem. The adapter I'm using is the Metabones Ultra Speedbooster which is to blame. Apparently the non-speedbooster adapters work no problem, but the speedbooster changes the flange depth too much. Thanks for the help!
Click to expand...

The real issue is that your lens doesn't have a large enough image circle. In other words, you're taking a lens that just covers S35, and then you reduce the image circle by 0.71x when you attach a Speed Booster. Hence the vignetting. As mentioned by Lian Hall, flange depth has nothing to do with it.
 
anothermember said:
Standard apology if this has been covered elsewhere; if so please direct me to it, I couldn't find it.

I've got an Optimo Style 16-40 on an FS7 and when zooming wider than 20mm the lens vignettes. Any thoughts why this is? Help would be greatly appreciated. Thank you!
Click to expand...

How are you liking the Optimo Style beyond the vignetting issue? I have been eyeing the Optimo Style 30-76mm as a possible interview lens. Is the image from the Optimo substantially better than a Canon EF zoom? If so, is it 8x the price better? I am wanting a true cinema zoom for interviews but it is hard to justify a $16k expenditure that will still lack a servo. Having a servo is great for those incrementally slow zooms into the subject when the topic is emotional. The Sony FE 28-135mm servo is difficult to feather on and off. It tends to jump into and out of engagement regardless of how careful one is on the rocker.
 
I haven't been able to review footage yet, will hopefully be able to by this weekend. We're actually going to be using the 30-76 for the second half of the shoot so that will change the overall review. So far it's got a lot of pros (overall image quality and contrast) and some cons (weight, zoom range as compared to a stills zoom). As far as feathering goes, I like the Cabrio lenses quite a bit, but of course they're a lot more $.
 
Well if it only vignettes wider than 20mm on the speedbooster (which is surprising, I'd expect hard vignette through the whole range) then you could just use it as a 14-28mm T2.0 which could be interesting :)
 
JPNola said:
Having a servo is great for those incrementally slow zooms into the subject when the topic is emotional. The Sony FE 28-135mm servo is difficult to feather on and off. It tends to jump into and out of engagement regardless of how careful one is on the rocker.
Click to expand...

While not exactly servo in the traditional sense, I've had luck using the little Zoom Stick on the 28-135mm for creeping in, or out. Trick is to rotate it slowly.

That said I usually yank the servo off the Optimo 19-90mm as I prefer the look of a hand push, or pull.
 
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