APS-H four thirds - the time is right?

Started Mar 17, 2010 | Discussions thread
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Wyepics_Wizard
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APS-H four thirds - the time is right?
Mar 17, 2010

We all know that the four thirds specification is too small to physically allow it to be used as basis for 35mm format. However the physical dimension of the four thirds mount does not prevent a larger sensor from fitting, with the mirror still able to swing upwards. The E330 for example had a mirror that swung the wrong way - sideways - so we know the sensor could have a height of at least 17mm and would still mechanically accomodate a mirror. Imagine an APS-H sensor of 18mm x 24mm.

Read the review on the latest Nikon D3s. That accepts the DX APSC lenses and automatically shades off the edges of the viewfinder. In an exposure it crops a DX sized image from the centre of the sensor. Our 4/3 camera could crop the viewfinder and sensor for orthdox 4/3 lenses, otherwise it would allow the full sensor size to be used.

The adaptor culture surrounding micro four thirds could then be nurtured to encompass the 4/3 dslr's. A larger sensor could make better use of 35 mm lenses than the 4/3 whilst still having a small amount of crop to use the sweet centre of the lens. The less than full frame sensor should be cheaper to manufacture than going for full frame. The smaller distance from sensor plane to lens mount provides space for adaptors for SLR lenses.

If the 4/3 image circle provides 12megapixels, the full APSH sensor would allow 20 or so megapixel. We would be talking resolution equivalent to the 35mm full frame Alpha900 or EOS5D. The larger sensor in a 4/3 body ought to be a winner, and would not detract from the utility of existing 4/3 lenses.

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