Dynamic Range and Medium Format

A very basic question about the FF, APS-C debate. I assume that the comparisons are done using the same lens and that the FF photo is taken from closer to the subject so that in both cases the identically framed image occupies the full sensor.

I appreciate that the pixel density of the sensor will also play a part in the detail captured.

Greg

Some testers are better than others, so I wouldn't assume anything.

I have a friend who bought the latest most expensive FF Nikon which can switch between the two formats. He would not belive that regardless of the sensor size selected the the image progected onto the sensor remained the same size.

Greg

If I understand what you say here, let's assume;

A rectangular block is to be photographed.

A 200mm FF lens is mounted on a tripod at X distance from the block.

The block size is ratio-metrically correct for the FF sensor on one face

With a FF camera attached to the lens and at X distance, the image captured is 1mm shy on both horizontal and vertical planes of the FF sensor.

The camera body is then exchanged for an APS-C body.

What changed? Not the image size. How much you see of it, yes.

I expect that to get the same 1mm gap all round, the tripod would have to move back by the crop factor, so another 50% of X for Pentax and 60% for Canon.

If I have this wrong, some one please point me in the right direction.

I can change the same settings on my D700 and without me moving position, what I see through my viewfinder is not the same on Fx and Dx.

Regards

I agree with you.

My understanding was that his camera a Nikon D3x could be switched between formats link and he believed that without moving or changing lenses that the image size projected on the sensor would increase or decrease dependant on the format he selected.

Greg

one time where the red eye effect will be a bonus!!!

No. You'll notice that when using the reduced size format the number of pixels used reduces from 24.5MP to 10.5MP - this is because we are now only using the centre part of the frame.

I never gave it a thought Don, never used a ringflash before.

Regards

[quote:3496ace15f="johnriley"]That is how I understood it.

Greg