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Tokina 11-16 Coverage on Epic

Adam C Lubkin

Adam C Lubkin

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Does anyone know what the range of this lens is on Epic full-frame? In other words, does it vignette and if so how much? I've seen several posts asking the question but no empirical answer.
Thanks,
Adam
 
Adam C Lubkin said:
Does anyone know what the range of this lens is on Epic full-frame? In other words, does it vignette and if so how much? I've seen several posts asking the question but no empirical answer.
Thanks,
Adam
Click to expand...

I did a shoot yesterday at 5kFF and there is slight vignetting at 11 mm, none at 16 mm. The 11mm shot has darkening at four corners that extends out toward center for about 60 pixels. Shooting in daylight with ND.9 at f/8, the lens is very sharp. Great for shoulder mount stuff, especially at 11mm.
 
Michael Mayda said:
I did a shoot yesterday at 5kFF and there is slight vignetting at 11 mm, none at 16 mm. The 11mm shot has darkening at four corners that extends out toward center for about 60 pixels. Shooting in daylight with ND.9 at f/8, the lens is very sharp. Great for shoulder mount stuff, especially at 11mm.
Click to expand...

That's great info, Michael. Would you mind posting a still of the image at 11mm? I assume that this is a Duclos 11-16mm since there is no Canon mount for Epic? Would coverage be any different with a Canon mount?
 
11-16 covers full frame 5dm2 from 13.5mm to 16mm so should cover epic which is smaller sensor
 
Hmm, might be the screw-in ND I used. >>>>> Aha, I checked a sky shot from an earlier shoot with MB-15 and NDs, NO vignetting. A lesson learned. The 11-16 Duclos is excellent in all respects. Sorry about the initial post, but again, it is a lesson learned...

Mike
 
I just posted in another thread. Figured it'd be useful here.

Jarred Land said:
The Tokina 11-16 works.. although it clips at full 5K on the edges below 14mm.
Click to expand...

Here's a frame grab at 11mm from a recent shoot I did. I didn't notice any vignetting. What you see at the bottom right corner is the door jam and the bottom left is an adjacent hallway. All the other corners seem clean to me? This was 5K FF too. Jeff Kilgroe was there, maybe he remembers something different, haha. EDIT: I should clarify that we were using the Duclos 11-16, not the Tokina. Same lens, just re-housed and PL mounted. Maybe that has something to do with it....

Screenshot2011-09-01at93816PM.png


EDIT: Here's another shot we did at 11mm. Much better example.

Screenshot2011-09-01at94208PM.png
 
So it seems that the level of vignetting can vary with the mount? (i.e. PL, canon, or Nikon)
 
I love this lens, what exactly is the difference between a Canon mount and the Duclos version, besides a PL mount?. I think I remember someone saying it is "de-clicked" what does that mean, just curious.
 
Jonathan Stevenson said:
So it seems that the level of vignetting can vary with the mount? (i.e. PL, canon, or Nikon)
Click to expand...

Absolutely not. But at the threshold will vary from lens to lens, from batch to batch. Since the lenses are used on format larger than intended we are seeing the variations. On APSC sensor- which is about 27mm diagonal or so- that would not be visible as it's outside of the sensor corner.
 
Jon's shoot where he mentions I was there... I was, and it was my Duclos-converted Tokina 11-16 (and Epic) that was used. I consider it to provide "full coverage" of 5K FF. The frames Jon is showing are 5KFF -- the overhead interior shot was full wide at 11mm, I don't recall the focal length of the exterior shot, but it was definitely wider than 14mm. There is some very slight vignette (more like typical fall-off or port-hole effect), that you see on many wide angle lenses, but as Greg notes, at 11mm only. It also varies with the iris somewhat from slight to all but unnoticeable. You can see the slight vignette in that interior shot. FWIW, I don't feel it's worth a second thought, or that it should even be called a "vignette". Many great and well-regarded lenses out there vignette or port-hole far more than this, even on conventional S35 frame width.

Jarred's comment about the Tokina 11-16 clipping corners at 14mm and wider has me wondering a bit... Unless perhaps the coverage differs between different production samples or series of the Tokina 11-16? Just the comment doesn't match up with the results I'm seeing with my Duclos unit when mounted on EPIC.
 
Repeat post from this thread.

Tokina11-16mm_Epic5KFF_framing.jpg


That's a quick still taken with my Canon 5D MkII and the Tokina 11-16mm set to 11mm and f2.8 (wide open) with guidelines showing what I calculated to be the Epic sensor size at 5KFF (5120x2700 pixels).

It's always possible my numbers are off so if someone who knows for sure can confirm them I'd appreciate it:

The Canon 5D MkII's active sensor area is listed as 35.8mm x 23.9mm with pixel dimensions of 5616x3744.

The Epic's active sensor area is listed as 27.65mm x 14.58mm with pixel dimensions of 5120x2700 (pixel pitch of 0.0054mm, assuming no space between them).

Based on that I created framing guides in Photoshop of 730 pixels from top and bottom of the 5D frame, and 639 pixels from the sides, to give the Epic 5KFF guidelines.

Incidentally I also calculated the Red One active sensor maximum for 4K to be 24.192mm x 10.368mm with pixel dimensions of 4096x2304 (pixel pitch of 0.0054mm).

That gave me (using the 5D frame again) 1060 pixels from top and bottom of frame and 910 pixels from the sides.

Whew!

Anyway, based on those dimensions (with the Epic 5KFF guidelines shown in my picture above as I understand them to be) the Tokina 11-16mm wide open at f2.8 gives just the slightest vignetting at 5KFF and essentially none at 5K 2.40:1. Stop down a bit or change to 4K or 4.5K 2.40:1 and there should be no vignetting at all.

Lastly, bear in mind that with the Epic sensor actually exceeding that of Super35 in dimensions, an 11mm lens effectively looks like a 10mm or 9mm lens on the full 5K image. So even if my calculations are a bit off, I'm confident that the 11mm end of the Tokina is more than useable for all but the most extreme of wide angle shots (where you could use Sigma's 8-16mm lens if you wanted to stay with DSLR stills lenses).

Hope this helps (and please, check my calculations and let me know if I'm off)!

Cheers from Tokyo,

Paul :)
 
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