About the Image(s)

We have a small nature reserve a few miles away, where some friends and I went on the forage earlier this year. Now, house flies are a nuisance, but they live out of doors more than in our houses! (Although there are far fewer than when I was a nipper.)

This is a single shot, so the depth of field is less than I would like.

At the risk of repeating myself, I do wish camera manufacturers would put all useful info in their EXIF files. Given that this is a macro lens, why on earth doesn’t the EXIF record the magnification ratio, or the focus distance? I don’t know. But my RAW file EXIF does record that the depth of field was “0.004m (0.323 ??“ 0.327m)” . I guess the numbers in brackets are the limits of the DoF as a distance from the camera ??“ or maybe from the optical “centre” of the lens. So, if we assume the focus distance was 0.325m, for a 90mm lens, the magnification ratio was 0.09/0.325 = 0.28. Lower than I had expected, but the image posted is cropped to about half linear size, so maybe it’s right. If I double this since it is a cropped sensor, then the magnification ratio is still only 0.56. Nearly “1:1 macro”! I note, though, that this depth of field value is not recorded in the .af or this jpg file, it’s only in the RAW file.

OM Systems OM-1, 90mm Olympus macro lens, 1/250sec, f13, ISO 200, hand held, outdoors, natural light. Processed in Affinity 3.