That's been my experience also with SFX and certainly Ilford do not claim otherwise. Blue water and skies will go quite black with the Red 25 but the silvery appearance of "green foliage associated with "IR " is missingI don't think you will get anything approaching the Wood IR effect with a Red 25 filter.
Hi, I have B+W 092 and 093 filters. The 092 is definitely the one to use for this film. I got decent results around EI 12, but you have to determine for yourself what EI you prefer. It is also developer dependent, so Xtol would give a different (higher) EI to HC-110 for example. The 092 is a very dark red filter, which also extends slightly into IR. It matches the sensitivity of SFX quite well. It is not a true IR filter like the 093, since it does pass some visible light, enough to be able to frame your shot through an SLR.
As an aside and more or less irrelevant to your post, I have used these filters on my IR modified D70. The 093 yields a monochrome image in the red and blue channels. No colour info whatsoever. The 092 yields a false-colour image with enough colour information to get some very interesting results. That tells you that you can play a bit with the 092's spectral response on different emulsions, while the 093 leaves no room for manoeuvring. I have not tried the Hoya R72, but it seems to be similar to the 092. Apparently, the 092 is the better filter for deep red/IR on film purposes, while the R72 is fine for false-colour on modified digital bodies. But this is hear-say - do some tests of your own if you can.
A nice way to shoot IR is to use a TLR with the filter only over the taking lens. That way you focus and frame in visible light, while the photo is made with the filter in place. You have to adjust the focus slightly, but if you are within hyperfocal limits you will be fine.
But what you said about the B+W 092 and R72 is totally backward, the R72 will give you much stronger IR effects than the 092 with currently available IR products.
Furthermore again, digital discussion is very off topic here and I'm not sure why you even mentioned it.
From personal experience, all you'll need for SFX200 is a Red 25 filter, anything more is overkill really.
In my tests the Red25 had little effect at all, and technically it shouldn't. I'm confused why you think this is true?
How do you define "little effect"? If you mean little wood effect" then OK although there is just a hint of a silvery glow but it will certainly give black skies and water which I wouldn't define as little. On a normal film with a Red 25 I can get nowhere near the "black look" that I can with SFX
pentaxuser
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