Originally posted by Wombat I was just about to say the same thing...
And nice example of Warnie, mate. I fully understand! The thought of that great arse wobbling in off a long run-up at the 'Gabba - jeez! Makes the eyes water.
So from what you and Wheatfield are saying you get more grunt, more contrast and grain, from a film that's pushed up to 400 ISO than a dedicated, out-of-the-box 400? When I got my ME-F a few days ago ('scuse me, I just wet myself with the joy and excitement of it...) I bought a couple of rolls of Ilford FP4 Plus B&W, 125 ISO. Just about finished the first roll and I was thinking of trying pushing it up a couple of stops, because I really love that deep black and heavy contrast look that you showed in a recent thread, Lithos. But you seem to be saying it's probably not worth more than one stop for B&W. So that would be 200, I guess. I might give it a go just for fun, then just experiment with other films.
Speaking of which, Wheatfield, have you tried Bluefire Police film, by any chance? I believe it's made in Canada. Came across it on the Frugal Photographer website and they describe it as medium speed ultra-high resolution, capable of heavy cropping. I'd be interested in your assessment if you've used it. And BTW, I notice a Rottie on your avatar. We had them for 18 years and just love 'em to bits. We're dogless at the moment, but if we ever got another, there's only one breed for us...
Thanks, guys. More stuff to have fun with - I want to live forever!
Cheers,
Les
I'm not going to try to wade through the Aussie whatever the heck you guys call that but..
I haven't used the police film, probably won't. My film interest is 4x5 sheet, I've pretty much gone to digital for everything else.
C-41 film is a develop to completion process. This means that what the box says is pretty much all you will get out of it for speed.
B&W neg film is somewhat more responsive, but no more than a stop of speed increase, and that takes a heck of a lot of extra development.
Slide film (E-6 and Kodachrome) are both more responsive to pushing because of the nature of the process (reversal).
Note, this is a seperate parameter from the exposure latitude. Lithos is spot on with his assessment, though I think B&W tends to have more latitude than C-41, just because of the ability to vary developement. T-grain films are less resonsive to development changes than conventional grained films.
Many years ago, I ran a series of film tests which I posted to the net. I was primarily comparing granularity, and to a certain extent, resolution, though it was fairly subjective, as it was pretty much all visual measurement. One of the films I tested was the old Ektapress 800 film. It was the only C-41 film that responded at all to push processing, and it may have given up as much as a half stop of speed, and that would have been a "two stop" push (according to the Kodak data sheet)
I did extensive sensitometric testing with various black and white films when I was teaching myself the Zone System, and found essentially the same thing as I found with C-41 neg film.
You can alter the characteristic curve and if you have detail in the zone 3 range, it can be brought up to zone 4, but this is not altering the actual measured speed, and you are raising your higher zones much faster, which gives the soot and chalk effect common to over developed films. I did make sure I ran my tests as close to the ISO standard as I was able to.
If you like Rotties, you might like my book:
A Day at the Beach | Book Preview
or some fun pictures of dogs playing on a beach:
A Gallery of Fun
Or even my boy growing up:
Jester's Index Page
Jester is an incredible dog by anyone's standard. His background is mostly Schutzhund on his sire's side (most every dog going back to the early 1900s being either a Schutzhund I or III, and lots of working titles on his dam's side as well.
He is sort of like John Wayne with fur......
He's my third Rottie, and is one of the hardest dogs I have met.
My own training background is obedience and the protection part of Schutzhund, and Jester is hands down the best dog I've ever had the pleasure of training for bite work.
He has a rock solid temperament, loves people, is a bit iffy with other dogs (not surprising for a herding dog), and is completely fearless.
He is also the most affectionate dog I have ever met.
_IGP4153
He's just past 2 years now, and has two obedience titles and 3 points towards his championship. He has excellent hips and good elbows. He has excellent movement, and very good conformation, though I fear he may be a bit easty/westy, but we'll see when he his chest drops and he hits his full weight. Right now he tips the scales at around 47 kilos, with his present build, I expect him to weigh in at around 55-60 kilos when he is done growing. He's a big boy at ~68cm to the shoulder with lots of bone and a well sprung chest.
Last edited by Wheatfield; 10-25-2008 at 01:57 AM.