That definitely can come from a complex optical path as well. The achromat helps with uniform sharpness, but won't solve any CA problems. It'd be interesting to see a comparison between the iscorama and the standard lens cropped to 2.35 and scaled up.

Tom, okay i understand that. I would like to see a full 1920 x 1080 frame that has been squeezed via this adaptor? Mark is that possible? The ones shown are all cropped down and might as well have come from a crop of a normal HD frame. Im curious as to the quality of this adaptor with a full res frame and the EX1 at its widest setting.

cheers
paul

Hi Paul

Did you download the last picture I put up?

It shows 2797x1080?

Oops, no i didn't. Have now though.

I think the CA renders the image unusable (imho). If you're looking for a wider fov then perhaps a dedicated sony wide angle adaptor (which is designed specifically for the EX1 lens) and crop down. If you're looking for resolution then i'd try scaling with one of those intelligent scalers (like the instant HD ones) but i think the resolution is a minor point.

Or a 35mm adaptor with wide lenses.

Or just step back a long way :)

cheers
paul

OK Today I took the whole thing outside. Set up a HD ready monitor and not full defination. Attached the letus with a pentax lens and then the anamorphic lens. I have added some colour correction of my own.

http://www.freewebs.com/markwilliams/Mark1.png

http://www.freewebs.com/markwilliams/Mark2.png

A few conclusions for me at least and with this setup. I cant trust the cameras LCD and histogram and getting focus right is very difficult. I now want a 1920 monitor.

A couple more

http://www.freewebs.com/markwilliams/Mark3.png

http://www.freewebs.com/markwilliams/Mark4.png

What do people think of these? Images good to go as are?

CA can be corrected in any software i believe.

in vegas, i triplicate the track, using color curves, let only a single color per track
put track in "ADD" mode, and you can resize the channels independently, fixing CA.

so, i let this project to fix CA. drag, and export. can use keyframes also to adjust based on zoom.

Oliver Neubert example:

very interesting.

As a Vegas user, I find it VERY interesting indeed.

Marlon, could you please elaborate on how exactly you "resize the channels independently" - do you use Track Motion? I'd suspect moving one single-color track relative to another could remove the CA in one place (say at the frame extremities), but introduce color shift in another (like the frame center)...

But I'm certainly missing something!

PS Perhaps you could share your example .veg file used to achieve this?

yes, i use track motion, with curves filters on track also.

of course, there other ways, other filters, better workflow. but this is my first try, i just got a ex3 about a week. testing now with shneider fisheye ;)

here is the project as example. values are crude, to be perfect need more samples and tests.

Here's another approach shamelessly borrowed from an AE tutorial elsewhere. Not without its pitfalls. The white dot is simply so I could tell how much desaturation was being done as I previewed the result at full raster.

Looking at the frame grab this doesn't look like classical CA, the amount of fringing seems too constant over the frame.

Hi Marlon, could you check if you get vignetting with your Fisheye please?

Er - the whole point of a fisheye lens is to place a circular 180 degree image within the rectangular gate. Now that's vignetting.

Full frame fisheyes on the other hand shouldn't obviously vignette.

Exactly - and this is why Marlon's method of moving the soloed red channel in relation to the other 2 channels over entire frame, actually works here!

In the case of typical CA, where it mainly shows at frame extremities, your method of adjusting color locally is more adequate - though tedious.

Isn't the Century/Schneider full frame?

I came across this video tutorial, but only for after effects - are there similar controls in Vegas ?

Removing Chromatic Aberration : Adobe After Effects Video Tutorial

sure ;)

vignetting is very low, normally not perceptible.

a quick test:

Yes. See the sample project file I uploaded above.
I used the Secondary Color Corrector to select the color of the fringe and to desaturate that color. As the tutorial also shows this can easily fail if the same color appears in other parts of the frame. Then you have to use a mask as well. That can become very tedious if you need to keyframe the mask as well.