Is 1.13x full frame?

Started Feb 24, 2006 | Discussions thread
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jeff-c
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Is 1.13x full frame?
Feb 24, 2006

Which is about 31 x 21 mm, short of the real 36 x 24 FF.

But why did I ask this size?

Becasue all the popular steppers made by ASML, Nikon and Canon cover 33 x 26mm today. If we include the area of bonding pad or outer peripheral of the sensor a size of 31 x 21mm is safe enough to be.

Obviously one can have the stepper expose twice to cover the complete 36 x 24mm full frame which is probably how Canon did it for its old line of FF sensors. The disadvantage of having multiple exposures is potential misalignment that reduces yield.

So if the semiconductor manufacturers use the current crop of steppers which are not cheap, they should be able to build sensors upto 31 x 21mm relatively easy.

So the question is, can we accept this size being the "Full Frame"?

If not, Nikon probably will need to build a new type of stepper to cover larger area, or figure out how to increase yield by using multiple exposure technique.

Let's see how 1.13x plays with our wide angle lens:

21mm -> 24mm
17-35 -> 19-41mm

Or if they work hard enough perhaps they could reduce the focal multiplier to 1.12x or 1.11x, 33 x 22mm is the maximum without boudry area which is about 1.10x.

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