Anyone shoot any film with the 18-50?

[Mike Prevette]

HERITIC! I'm sure you all are screaming. In my world film is still a viable option for some projects, so I was wondering if anyone with the 18-50 has turned some 35mm over with it. Results?

[Brent J. Craig]

I haven't rolled film thru it, but I have looked at the lens on a Super35 (TV) Arri 435 and can confirm that it does not vignette.

[Stephen Williams]

I haven't rolled film thru it, but I have looked at the lens on a Super35 (TV) Arri 435 and can confirm that it does not vignette.

Hi,

Has anyone tested how accurate the T stop marks are?

Stephen

[chuck colburn]

Hi,

Has anyone tested how accurate the T stop marks are?

Stephen

Hi Stephen,

Century Optics use to have an intergrating sphere for "T" stopping lenses. I don't know if they still do, but mayby someone in L.A. could look into that. I would think a massed produced "T" stop ring on the zoom would be more than close enough.

[Stephen Williams]

Hi Stephen,

Century Optics use to have an intergrating sphere for "T" stopping lenses. I don't know if they still do, but mayby someone in L.A. could look into that. I would think a massed produced "T" stop ring on the zoom would be more than close enough.

Hi Chuck,

I would have thought so myself, but in view of collimation issues reported on this site I would want to know for sure.

I am sure it's good wide open but what about T5.6 that is probably the sweet spot?

Stephen

[Billy Summers]

...and no witness marks...:umm:

[Stephen Williams]

...and no witness marks...:umm:

Hi Billy,

Adding witness marks by hand is time consuming. With the £ worth over 2 USD's I am not surprised, as those Sigma lenses are rehoused in England. I would have thought it could have been done cheaper elsewhere at at least as good (if not better) quality.

Stephen

[chuck colburn]

...and no witness marks...:umm:

CAN I GET A WITNESS! LORD ABOVE!

Really? No witness mark? I got a couple of grease pencils you can have Billy. lol

That's kind of wierd. Since the whole lens has new external shells all the had to do was make either the aperture or witness mark ring adjustable and it could have been part of the assembly procedure.

[Stephen Williams]

Hi Chuck,

I think the T stop has a witness mark, it's the focus distances that are slightly open to interpretation.

Stephen

[Brent J. Craig]

Any good rental house should have a device to test the accuracy of T-stops.

Often they don't advertise the fact because they don't want to deal with the angry mobs when the T-stop accuracy of most cine-zooms is revealed. Make friends with a lens tech at a place like Panavision.