glen_h

I sometimes still use ASA when describing old enough cameras, or old, though maybe not old enough, film in one of them. Some standards organizations now release versions for personal use. Others release the draft versions, close enough to the final version.

Some years ago, I was scanning some of my grandfather's Tri-X negatives from about 1960, and realized that the scans were resolving grain. I believe grain, and not grain aliasing, but it could have been that. In any case, what seems strange to me is using the middle 3600 pixels of a 40800 wide line sensor.

Cameras have to use a 2D sensor array. Scanners usually scan, that is move either the sensor or the object, to move the image across a 1D sensor array. The Epson V800 has a 40800 sensor element wide array. It is actually six rows of 20400 sensors, that interleave to get 40800 across by three colors. But that is across 8.5 inches of scan width, for 4800 pixels per inch. As far as I know, no-one makes rectangular 2D sensors with anywhere near 40800 on one of the sides. For 35mm film, I prefer a scanner with a narrower sensor, and optics to match the 24mm image width. But okay, if you already have a good quality DSLR, that should be fine for slides, and I suppose black and white negatives. For color negatives, you have a complicated adjustment for the color mask, and especially the low gamma of usual color negative films.

Gasworks park in Seattle. The last running coal gasification plant in 1956, converted to a city park.

My 5th grade teacher, on a Canon VI.

Lit by moonlight, but some stars, and reflections of stars, are visible.

A big people sensitive LCD drawing panel

Tmax 3200 (TMZ) at EI 3200, and about 10 years past date.

A favorite is cars in the image, where the year range of production can be known. C-41 first appeared in 1972, but it was a few years for the changeover, with C-22 films like CX still around. If it is 1973, it is close to the end of C-22 years.