Why stick to only one film?
In short: To eliminate variables.
It's very tempting to try out new films and see what results you can get with different films and developers. Ferrania for example just announced their first film. An 80 ASA B&W film in 35mm. And Yes! I was tempted at first. I'd love to try it and help them test the film, but I just went through a testing phase for 100 speed films. I shoot 400iso 80% of the time and 3200iso for the remainder. I rarely need a 100 speed film for my type of shooting. Sometimes it does come in handy though. On the beach or on a snowy mountain in full sunshine, I just can't make the 400 speed film work without stacking filters. So I got myself some Fomapan and Silvermax to test and I don't like testing films. It costs money and takes time. I don't feel like going through another test for this new P30 film.
The problem with shooting many different films and processing them in different developers is that your number of variables grows. If something goes wrong or you don't like the results you don't know where to start fixing it. If you only scan your film this makes very little difference, but then you might as well just shoot digital and apply a film filter. I like to be able to print my work. I don't print all of my work, but I like that I have the option to print it and when I do print I noticed that having a good negative makes all the difference. There are many ways to arrive at a good negative and it can be overwhelming.
FilmStock^n + Dev^n + DevDilution^n + Agitation^n + Temp^n + DevTime^n + EI^n + Paper^n + PaperDev^n + etc... = # of ways that you can tweak to get a decent negative.
This is nuts. If you keep changing things you'll never arrive at consistent results unless it's by luck. Keep as many variables constant as you can. If something does not come out to your liking you can start tweaking one variable and observe if that makes a difference without having to guess. starting by these three makes the most sense to me:
- Shoot 1 film stock
- Use the same Developer
- Keep temperature constant * (more on that below)
* Keep the temperature the SAME! I know people argue that chemical reaction speeds up with increase in temperature and you just adjust the dev time and arrive at the same results. While that is true in general, there is more to it than that. When you change temperature there are a few things to consider. The gelatin of the emulsion absorbs developer at different rates depending on temperature. This is change is most likely not linear with how silver halide reactivity changes. Even worse the developer itself is made up of:
- Developing agent
Unfortunately these components don't change linearly when you increase temperature. To make things easier, just keep everything at 20 degrees until you get constant results that you like.
In my case I try to stick to Tri-X and Delta 3200 for most situations. The D3200 I only use for indoor low light situations. I find it too flat for anything else. Tri-X, or any other 400 speed film is actually really versatile. I shoot mine at 500iso. Usually I have a yellow filter on the lens which brings it down to an effective speed of 320iso. If I need even slower than that I take out the orange filter which puts it to 125iso.
f/16 1/125, f/8 1/500, f/5.6 1/1000
I can work with that.