I have a 20D and a 450D and I am finding that when I shoot landscapes, including star photography with long shutter speeds, I have very high noise, even at my lowest ISO of 100. I can't afford a new body, even the old 1D right now but need a solution. I've also noticed some noise even at faster speeds, up to about 1/40th at ISO 200.
I also have an old AE-1 with several lenses I use on my EOS bodies with an adapter from time to time (not a factor in the noise). If I could get my hands on some 25 ISO film or even 50 would that be a big enough change? Would it be worth it? My lenses aren't spectacular. My best being a Canon 70-210mm f/4 and Kiron 105mm f/2.8 Macro.
Any other solutions? I've tried cleaning my sensors too and that doesn't help. These aren't extraordinarily old bodies and should have higher performance in my mind.
Thanks in advance.