Will the Epic 645 hava a OLPF?

[Michael Lindsay]

I ask this as many in the stills world like the look of false detail (crunchy) and I know of no medium format digital system with a OLPF...

Additional questions:

with 6micron photo sites and stops above f11 is the fuzziness due to diffraction enough?
Am I wrong and is there a MFDS with a OLPF?
Is it possible to make a OLPF big enough for the 645...
Has pulling the OLPF away from the sensor (red 1) allowed it to be thinner?

Personally I hate false detail and hope it does have a OLPF (and slightly assume it will). That said I know this world a bit and am curious how red will deal with the pixel peeping assistants and their 1 to 1 digital loupes?

kind regards

Michael L

[Tim Griffith]

If I recall correctly I think the Mamiya ZD & ZDb back had a detachable OLPF. really pushing the memory now but I think the anti-aliasing could be corrected with software? either way, I think you would get that false detail in both, not sure what they do now days.

Tim.

[Pawel Achtel]

with 6micron photo sites and stops above f11 is the fuzziness due to diffraction enough?

At f/11 the diameter of Airy disk (the smallest point on which a beam of light can be focused) is 17 microns.

[Michael Lindsay]

Hi Pawel

At f/11 the diameter of Airy disk (the smallest point on which a beam of light can be focused) is 17 microns.

Do you think that is enough to not need a OLPF?

Tim

If I recall correctly I think the Mamiya ZD & ZDb back had a detachable OLPF. really pushing the memory now but I think the anti-aliasing could be corrected with software?

Do you mean that the softness from a OLPF can be compensated for with edge enhancement?

Michael

[Pawel Achtel]

Do you think that is enough to not need a OLPF?

It's more than enough. The smallest detail the lens can focus at f/11 would be 3x3 pixels large.

[Michael Lindsay]

I aked not because of the maths you gave but because I've seen lots of medium format stills which seems to have aliasing but are shot at f11+. Maybe I'm wrong and the crunchiness I've seen in the Raw files is the result of something else.

I will dig out some examples and check..

I am excited by the Epic 645 but am wondering about its viability!

regards

Michael

[Tim Griffith]

Michael,
Sorry, I'm really not sure, I haven't had much experience at all with the ZD's, i just remember there being a detachable OLPF, and the software did some funky stuff to correct for this (I never went down this path), but I assume that the software would enhance the edges or something similar.

Tim.

[Stefan Christou]

Pawel are you sure you are not talking about f11 on a S35 lens? I'm asking because the relative aperture of f11 might be a larger physical aperture size on medium format than on s35 glass.

[Tim Griffith]

it wouldn't matter, f number is only affected by the focal length of the lens and the apertures diameter. so any 50mm lens at f11 will ALWAYS have an aperture diameter of 4.5mm.

Tim.

[Pawel Achtel]

Pawel are you sure you are not talking about f11 on a S35 lens? I'm asking because the relative aperture of f11 might be a larger physical aperture size on medium format than on s35 glass.

The sensor size is irrelevant.