Donald, thanks I will check.Quote:
Originally Posted by Donald Qualls
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Donald, thanks I will check.Quote:
Originally Posted by Donald Qualls
Here are a couple of long exposures, green xray film at 80 iso with a ten stop nd filter. Excuse the scratches, that's another hurdle
Attachment 152874Attachment 152875
How long?
Quote:
Originally Posted by andrewch59
If I remember correctly the chimney was f22 and about seven minutes, the lake was about f32 and five-ish
That is no reciprocity correction.
Cool. Great work.
Quote:
Originally Posted by andrewch59
As you know its not an exact science with clouds and changing light conditions more guestimate after taking a meter reading to get in the ballpark. Was pleasantly surprised, use the filter a lot more now to get the added shadow detail and contrast. The one with the chimney has my wife placed to the left of the chimney, I took her out of the shot at the three minute mark. Gives the effect of ghosts from the past.
Jim,Quote:
Originally Posted by Jim Fitzgerald
I had this on a few negatives but attributed them to a chemical streak until I read your post. I have no idea what can cause them other than a drop of water or developer rolling down the film before or just after development and before fixing.
I have not had the problem in the current box of film.
Jim
Interesting thought above about reciprocity: I took a couple of long exposures - four minutes and ten minutes - inside Canterbury Cathedral, a very gloomy place. That was as metered, plus a guestimated 100% increase for reciprocity, and ended up way over-exposed - looked like three or four stops. Examination of the focus doesn't suggest that I left the lens wide open...
Scanned with my default settings, which on the X-ray film sets the blue base to 9% and peak white (i.e. peak density) to around 95%, in this case placed the black level in excess of 60% and compressed the white - rather nicely I think - to about 98%. Agfa Green, 50ASA, 7 minutes in 50:1 Rodinol.
Attachment 153201 Attachment 153202
(first image as scanned; second after playing with black and white level and a little gamma - 0.9 - and some unsharp mask. A fine set of ghosts wandering through the shot - four minutes - not helped by a fellow on a powered chair who seemed keen to maintain his batteries...
Further investigation needed here, I think; there were too many variables to be sure what happened.
Neil
http://www.bwvision.com/complete-gui...-2016-edition/
On the complete guide site they have a chart you can download, Its my point of reference, then I just look for changes in light condition and try and guess accordingly. Like your Cathedral shot I shot down at our lake with fog coverage and exposed for two minutes with another thirty seconds for reciprocity, turned out pretty spot on.
https://www.flickr.com/photos/135622...posted-public/
The only manipulation was backlight adjust on scanner and removal of scratches
Finally got around to exposing some Ektascan B/RA X-ray film. Read as much as I could on this thread for processing info and went with Rodinal 1:100 for 6 and 7 minutes (this particular shot was processed for 7') around 72°f. single sheet in a Jobo drum (2xxx series with cog lid and cup) on a CPP-2.
Shadows were a bit thin (forgot to factor in bellows extension) and highlights kind of hot. Knew it was contrasty going in but happy for first effort. Photographed in afternoon shade so will try in warmer light to see how it responds.
Will also photograph a scene with more range and if it looks good, I will definitely shoot more of this film.
Zone VI 8x10 Schneider 300 5.6 Apo-Symmar. Exposure was 1s @f8