GH2 vs Newest Sensors for heavy 16:9 RAW Processing

Started Jan 22, 2013 | Discussions thread
jimoyer
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Re: GH2 vs Newest Sensors for heavy 16:9 RAW Processing
In reply to photodan1, Jan 22, 2013

photodan1 wrote:

Detail Man wrote:

Pasmia wrote:

Think Joel Grimes or Dave Hill type of photography and processing (maybe a bit more heavier), which would be the better option for processing 16:9 images: the native 16:9 option of the GH2 or cropping the latest sensors?

Currently using G3, semi-satisfied, but always looking for ways to improve. Files are a bit too noisy after cropping and processing without excessive use of NR.

Asking more out of curiosity than to upgrade. Just getting some ideas.

The difference (in pixel-area) is 4976x2800 (13.932800 Mpixels) versus 4608x2592 (11.943936 Mpixels) for a standard image-sensor. The differences in Angles of View are as follows:

GH2 multi-aspect-ratio pixel-dimensions for 16:9 aspect-ratio are 4976x2800 (as opposed to 4608x2592 cropped from 4:3). Panasonic states the GH2's pixel-pitch to be 3.8 Microns.

The calculations below are based on a 3.8 Micron pixel-pitch (only). The G3's image-sensor pixel-pitch being specified at 3.75 Microns, and the GH2's image-sensor pixel-pitch being specified at 3.8 Microns by Panasonic, there exists an extra 1.33% size difference in the GH2 that would increas the AOV differences (and reduce the 35mm equivalent focal lengths) by approximately that amount (when compared to the G3).

Calculations of 35mm Equivalent Focal Length below are referenced to full-frame dimensions of 36mm x 24mm (43.267mm diagonal).

.

When comparing the (diagonally referenced) Angles of View and the 35mm Equivalent Focal Lengths of the GH2's MAR sensor and a conventional 16 Mpixel image-sensor (when cropped to 16:9 aspect-ratio), the differences are (IMO) fairly significant:

The diagonally-referenced dimension for the multi-aspect-ratio 16:9 is 8% higher than that of a 16:9 image cropped from the standard 4:3 aspect-ratio active-area (AOV=75.543 Degrees as opposed to AOV=71.320 Degrees, representing a 5.92% larger AOV in the case of using a 14mm actual Focal Length lens).

The net effect upon (35mm equivalent) Focal Lengths (in the case of using a 14mm actual Focal Length lens) is to increase a 27.918mm specification (with multi-aspect-ratio configuration) to a 30.151mm specification (an 8% increase, corresponding to a Focal Length ratio of 2.154 as opposed to a ratio of 2.0).

.

When comparing the (horizontally referenced) Angles of View and the 35mm Equivalent Focal Lengths of the GH2's MAR sensor and a conventional 16 Mpixel image-sensor, the differences are (IMO) fairly significant:

The horizontally-referenced dimension for the multi-aspect-ratio 16:9 is 8% higher than that of a 16:9 image from the standard 4:3 aspect-ratio active-area (AOV=68.063 Degrees as opposed to AOV=64.041 Degrees, representing a 6.28% larger AOV in the case of using a 14mm actual Focal Length lens).

The net effect upon (35mm equivalent) Focal Lengths (in the case of using a 14mm actual Focal Length lens) is to increase a 26.654mm specification (with multi-aspect-ratio configuration) to a 28.783mm specification (an 8% increase).

.

The formulas used to calculate the numerical result abive:

AOV = (2) x ( Arctangent ( ( S ) / ( ( 2 ) x ( L ) ) ) )

where:

AOV is Angle of View;
S is the frame-size (either width, height, or diagonal);
L is the Focal Length.

Re-arranging the identity stated above yields:

EFL = ( S ) / ( ( 2 ) x ( Tangent ( ( FOV ) / ( 2) ) ) )

where EFL is the 35mm Equivalent Focal Length; and
S is the width, height, or dagonal dimension of 35mm full-frame.

Dude, I know why they call you Detail Man;)

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So after doing all those calculations in my head, the answer is........Yes????  

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