mrossano
21-Apr-2010, 10:34
I posted this question on photo.net, but haven't uncovered any first-hand reports, so please be kind enough to indulge me here:
It has been discussed many times that the lenses seen in various guises as Computar f/9, Apo Kyvytar and (sometimes) Graphic Kowa have exceptionally large coverage. It has also been mentioned that field curvature becomes significant as we approach the limits of the 95 or so degree coverage. Based on the experience of actual users, at what point (75, 80, 85, 90 degrees?) does this become detectable (as opposed to objectionable, which is a looser and more subjective criterion)?
I'm trying to decide on one of four options in the 240mm-250mm range for use as a semi-wide angle on 8x10:
240mm Computar/Kyvytar/Graphic Kowa
250mm (10") Wide Field Ektar
240mm Docter Germinar-W
250mm f/6.7 Fujinon W
I expect to use the lens for architectural exteriors, among all else. Past experience has shown that for my work habits, noticeable field curvature gives me fits, so I'm trying to pick a lens that exhibits little or none within an 80 to 85 degree field. Anyone care to relate their experience?
Thanks!
It has been discussed many times that the lenses seen in various guises as Computar f/9, Apo Kyvytar and (sometimes) Graphic Kowa have exceptionally large coverage. It has also been mentioned that field curvature becomes significant as we approach the limits of the 95 or so degree coverage. Based on the experience of actual users, at what point (75, 80, 85, 90 degrees?) does this become detectable (as opposed to objectionable, which is a looser and more subjective criterion)?
I'm trying to decide on one of four options in the 240mm-250mm range for use as a semi-wide angle on 8x10:
240mm Computar/Kyvytar/Graphic Kowa
250mm (10") Wide Field Ektar
240mm Docter Germinar-W
250mm f/6.7 Fujinon W
I expect to use the lens for architectural exteriors, among all else. Past experience has shown that for my work habits, noticeable field curvature gives me fits, so I'm trying to pick a lens that exhibits little or none within an 80 to 85 degree field. Anyone care to relate their experience?
Thanks!