Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
JimKasson
JimKasson Forum Pro • Posts: 26,647
Re: Help judging performance of my FE55z, FE35f2.8z horizon/infinity

l_d_allan wrote:

JimKasson wrote:

l_d_allan wrote:

I think the assumption that near-infinity horizons are acceptable for lens evaluation is an obsolete carry-over of the [bad] old days of film.

IIRC, A.A. relied on testing with trees on the horizon, and what I think he described as "infinite detail the closer you looked".

In terms of cycles per picture height, an 8x10 view camera with film in it is nothing to sneeze at, even by today's standards. Such negatives are sufficiently sharp that there is a clear difference between an 8x10 silver-gelatin contact print on F paper and an identically sized print made in an enlarger.

Not meaning to be argumentative (moi ?), but surely you aren't claiming/extrapolating that what was sufficient for the 8x10" view camera you may still own is therefore fine and dandy for a 42 mpx Super-Exmor?

I sold my Arca Swiss 8x10 about 8 years ago. Actually, I traded it for part of a new Nikon 400/2.8. I still have 'chromes made with that camera. There is nothing in digital photography like putting one of those on a light box. With panos, you can beat the resolution, but you can't print that sharp. I also own 8x10 and 8x20 silver contact prints. They are amazing, too.

Consider this: with 20 cy/mm on an 8x10, you'd get 4000 cy/ph. I did that in my head; I hope I got it right.

And I do realize that your climate situation may very well allow you to "get away with" near-horizon tilted captures ... especially since they are right outside your door and thus much handier than a brick wall you'd have to drive to.

I'd suggest that a reasonable guideline for the rest of us might be that:

  • IFF you have a suitable climate (which we both do)
  • IFF you can walk to a suitable scene with near-infinity flatness of field targets (see below for my situation) ... then
  • Knock yourself out with tilted horizons

But remember that it's qualitative. And then there's focus. And field curvature.

  • Otherwise if you have to drive, consider using a brick wall (of which I have 2+ within walking distance so I don't have to drive to do that testing)

Alignment? How are ya gonna do that? not saying it's impossible, but what's your proposal?

180 deg FOV pano from FE28 within easy walk from my front door. Not intended as test scene since there was no intent to have a flat field with all trees at near-infinity ... but that I am fortunate to have a usable near-infinity scene close by. Even better, it would work with a wide variety of focal lengths.

I'd also acknowledge that my non-aversion to brick walls may at least be partly due to having several good ones within walking distance.

Jim

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