PL Mount 11-16mm f2.8 Prototype, Manual Iris

[Mike Prevette]

Can I pay you yet?

 

[Roberto Lequeux]

Nice! Very encouraging Matthew. Thanks for the info.

 

[Paul Hazlett]

thanks for the chart....but please dont quite your day job to do graphics....heh heh.

 

[Erik Widding]

It's originally a DX format lens which covers the RED One sensor just fine. Here's a quick little (childish) illustration.
(before I get slammed for crappy images, these were taken with my phone...
the distortion is not from the Tokina, it's from my phone taking pictures at an angle... Back to business.)

Please post the uncropped images so it is easier to understand the distortion due to the camera phone. FWIW, the cropping makes it look as though the distortion is in the projected lens, and not the camera phone lens.

 

[Matthew Duclos]

I was afraid of that... Hence the preface.
The images weren't cropped. They came from an iPhone. hahah
It was simply a picture to show the coverage. Not the distortion.
If you look at the first picture, you can see the iris rods from my projector...
That gives you an idea of the angle I was snapping the pic from.

 

[Erik Widding]

Hate to break it to you, but the iphone is actually reducing the apparent distortion in the lens. Second picture, lower right corner, I see barrel distortion from your iphone. We can assume that the projected lens is not bending the lines at the center of the lens, but in the images they appear to be bent. This can be taken as representative of the distortion in the iphone. So, in the upper left corner of the same picture, the pin cushion distortion is actually reduced by the iphone's barrel distortion.

Ironically, the barrel distortion of iphone lens is causing it to appear as though the projected lens has less barrel distortion (when thought of as a taking lens) than it really does. I see the distortion as significant at ff35, but not quite so significant at s35. Nevertheless, this lens, rehoused or not, canon, nikon or PL attached to the camera, is looking like an interesting option.

 

[Mitch Gross]

Guys, the projector is about a foot away from the wall. Use any extreme wide angle that close and it will appear to distort. Back it up a bit and Matt would need a theater screen to handle the projection angle. Remember, we're talking 11mm coverage here.

 

[Matthew Duclos]

Exactly Mitch. Very good point. The rods are practically against my projection surface.
There are plenty of pictures around the web taken with the Tokina that show distortion.
Matt Uhry used it just this last weekend on a shoot and came back with some great results.
Im pretty sure this is at 12mm

 

[Shawn Nelson]

Exactly Mitch. Very good point. The rods are practically against my projection surface.
There are plenty of pictures around the web taken with the Tokina that show distortion.
Matt Uhry used it just this last weekend on a shoot and came back with some great results.
Im pretty sure this is at 12mm

That's seriously awesome, I assume this is on Red using your Tokina?

 

[Matthew Duclos]

Here is another shot, still a mere 4' from the wall at 11mm.
I can't go any farther back because my wall isn't big enough to show the coverage of the projection.

 

[Matthew Duclos]

That's seriously awesome, I assume this is on Red using your Tokina?

This was from Matt Uhry. He was using the very first prototype lens on a RED.

 

[Matt Uhry]

This was from Matt Uhry. He was using the very first prototype lens on a RED.

Confirmed 12.5mm on the Red, Quad HD mode.

It's not that there is NO barrel distortion, there is just very little. It's really good.

We shot some test footage yesterday afternoon with it. This weekend or next week I think Ken Corbin is going to take it for a dive near Anacapa Island.

I should be able to cut the footage together into a little reel by the end of next week.

Matt Uhry
www.mattuhry.com

 

[Mitch Gross]

Here is another shot, still a mere 4' from the wall at 11mm.
I can't go any farther back because my wall isn't big enough to show the coverage of the projection.

Kinda looks like a VW bus headed into a dark tunnel, doesn't it? ;-)

 

[Jeff Kilgroe]

Can I buy one yet? :beer:

 

[Matthew Duclos]

Kinda looks like a VW bus headed into a dark tunnel, doesn't it? ;-)

Ummm... I think this must be an optical illusion from my iPhone.
The large VW shape in the lower middle is a reflection from the aluminum surface on the phone.
Accompanied by the distortion of the iPhone and the lack of aperture blades...
The Tokina will not render VW buses in real life.
I kid, I kid.
Century Projector FTW!

 

[Paul Hazlett]

Exactly

now if this kind of shot don't get your juices moving for this lens I dont know what will.

soo about that payment address?

 

[Roberto Lequeux]

Holy building blocks batman! Wow... #$&@! I want to shoot with this combo NOW!

That is gorgeous work Matt. Love the colors. :thumbsup:

Matt, would you say that 12.5mm is the bleeding edge of distortion "free" territory? From the charts it seems 13mm is very clean, but when in a pinch push it to 12.5mm, not further?

Or was 12.5mm just what you happened to set it to considering everything and not just distortion? I guess my question should be: do you use the lens wider than 12.5mm? If so, often or only under certain conditions?

 

[Matt Uhry]

This is at 11mm in 4k mode. Since it's wide you see the lines converge, but there is very little barrel distortion at 11mm.

Matt Uhry
www.mattuhry.com

 

[Paul Hazlett]

This is at 11mm in 4k mode. Since it's wide you see the lines converge, but there is very little barrel distortion at 11mm.

Matt Uhry
www.mattuhry.com

that is friggin awesome. where are you? a lampost factory?

 

[Matt Uhry]

Urban Light by Chris Burden. It's on Wilshire in LA near Fairfax.
Beautiful! First time I saw it lit I almost crashed my car.

Matt Uhry
www.mattuhry.com