Anamorphic Footages De-Squeeze!

JJKizak wrote on 12/19/2019, 6:45 PM

I believe they are speaking of close-ups verses infinity focusing which will cause some linear distortions. However I fail to see how this would affect the aspect ratio at all unless you are double focusing through an adapter anamorphic lens which then you might see vignetting.

JJK

@JJKizak It's indeed a double focusing system and I do see bad vignetting in Full Frame mode. But, what this has to do with the anamorphic ratio?

I agree. Only the lens itself can affect the ratio assuming the ratio is constant for every part of the lens. And I assume the normal linear tolerance is somewhere around 1%. In other words the aspect may be 2.34 to 1 at the center of the lens and 2.5 to 1 at the edges. That's why a Panavision anamorphic zoom lens will cost you $40,000.00 versus $300 for an adapter lens although my memory is getting bad on prices.

JJK

aboammar wrote on 12/21/2019, 1:34 PM

@Marco. Here is another reply from SLR Magic:

"Basically, when using all anamorphic lenses at infinity, the compression ratio is most accurate.

As you focus closer than infinity, there will be anamorphic mumps characteristics, leading to l

a smaller compression ration."

Marco. wrote on 12/21/2019, 2:03 PM

Really odd. If that means it may vary between 1.2 and 1.33 – how do others deal with this? This would mean you'd need a different correction ratio for each shot and you could not focus between different distances within the same shot.

Any chance to make some test recordings with circles or squares focused at infinity?

aboammar wrote on 12/21/2019, 2:08 PM

@JJKizak Well, I know that true anamorphic lense are very expensive, but the SLR Magic anamorphic adapter costs $1500 and at this point and with those limitations, I am not sure it is worth its price!

aboammar wrote on 12/21/2019, 2:11 PM

Really odd. If that means it may vary between 1.2 and 1.33 – how do others deal with this? This would mean you'd need a different correction ratio for each shot and you could not focus between different distances within the same shot.

Any chance to make some test recordings with circles or squares focused at infinity?

Indeed odd and truly does not make a sense to me!

I will make another test tomorrow at infinity focus and share it with you.

aboammar wrote on 12/25/2019, 12:24 PM

@Marco. Here is another test recorded at infinity focus. The focus is not perfect but it should give a good idea.

You can download the camera file from here:

http://www.mediafire.com/file/1p1ht4zltbe1oto/C0001.MP4/file

From what I can see, the anamorphic ratio is not a perfect 1.333 but maybe it is close enough.

Marco. wrote on 12/27/2019, 6:06 AM

Measuring the 1.33 corrected circle I still get a PAR of about 0.95.

In regard to how bad it is if focus is not infinity, if I'd be you I'd rather shoot 16:9 with regular lenses and then crop to a display ratio of 2.35 in the end. You'd get a better and straighter handling while shooting, better quality, more flexibility.

aboammar wrote on 12/28/2019, 5:48 PM

Measuring the 1.33 corrected circle I still get a PAR of about 0.95.

In regard to how bad it is if focus is not infinity, if I'd be you I'd rather shoot 16:9 with regular lenses and then crop to a display ratio of 2.35 in the end. You'd get a better and straighter handling while shooting, better quality, more flexibility.

@Marco. Totally agree with you, although cropping the 16:9 to 2.35 will not give me the real anamorphic look when it comes to bokeh and lens flare. If the adapter was priced at lower than $300, I might consider keeping it, but for about a $1,000 it is definitely not worth it and I am returning it to B&H.