Relative Focal Length, Angle of View, and CCF Chart

[Barry_Green]

I don't think so... i looked up the S2Pro on an old review, and it looks like it's a larger-than-APS-C sensor, 23x15.5mm. So that should be a 1.5 crop, not a 2.0 crop.

[d.w.vaughn]

Thanks Barry. I confirmed as well; 1.5x. That'll will make it a little more challenging.

[Luciano]

Thanks, Barry!
Truly appreciated... as usual.

[Shooter]

Hey Barry

Nice chart and very helpful.

Now...can anyone make this up as an Iphone and Android app. (preferably Android first)

I have apps that cover other lenses and formats but this one could be unique.

[Justyn]

I think I'll be in the market for a DOF calculator... reminiscent to my old bygone film days. Would be nice to know where the focus resides for run and gun type stuff... I also think I'll be breaking out my trusted tape-measuring device. I just wonder what I can do with that old changing bag....

[olof]

Pcam is a great app for that, it may have been pointed out here before but here is a link:
http://www.davideubank.com/Good_Focu...alculator.html

[Denis Haineault]

Many thanks for this Barry. You are awesome and I'm sure you smell terrific!

[Shooter]

FWIW

I think that an Android app called 'CamCalc' covers 4/3 focal length conversions with all other lenses..

I need to check it against the chart that Barry published for verification.

BTW : its a great little film app and worth considering for all the cinema tools it contains including lens conversion.

[Peter J. DeCrescenzo]

Yes, the AF100 sensor is identical in size to the GH2 and GH1 sensors.

Thanks, Barry! The attached photo was taken by Glenn Przyborski, DP. The photo shows a piece of exposed academy format 35mm cinema film next to a GH1 so we can see the film negative size compared to the sensor size.

A picture really is worth 1K words.

[nosys70]

http://vimeo.com/14832168

http://vimeo.com/8212104

and remember that if you need to set back to get a bigger field of view, framing will be more difficult too, since your pans must be 1.6 smaller/slower and any vibration in the tripod is amplified 1.6 time.
the DOF will also change (it is relative to distance of subject) , the more you set back the deeper it become.

[Squirrel]

This article from www.creativevideo.co.uk gives the low-down on sensor sizes and crop factors...

[olof]

The 4/3 dimensions don't seem right. 17.3mm x 13mm is the 4/3 standard. I know it is cropped to 16:9 but I don't think the chart is correct.

[Barry_Green]

That chart is totally wrong for 4/3. It's using numbers that are somewhat close to S16 film, but nowhere near what the 4/3 sensor is.

[Squirrel]

That chart is totally wrong for 4/3. It's using numbers that are somewhat close to S16 film, but nowhere near what the 4/3 sensor is.

Thanks Barry, olof - Should read 17.3 x 13mm for 4/3 in 4:3 mode. Area and crop factor are correct though. I'll get this corrected and edit the post later!

[lluis]

Yes, the AF100 sensor is identical in size to the GH2 and GH1 sensors.

Sorry, in this case the chart is wrong: the real dimension of the AF100 sensor in 16/9 is actually bigger: 18,8x10,6mm (it has the same diagonal than the 4/3 picture mode: 17,3x13mm).