Comments on: Slide Film is tricky, after all!

By: boombadeus

boombadeus — Wed, 03 Jun 2009 02:31:24 +0000

Joe, I wonder what it is with that. Like you say, I’d expect the cir-pl to be no problem with the metering. All I know is, I’ve been more or less permanently scared off from using a polarizer of any kind on the K1000 again!

By: Joe

Joe — Tue, 02 Jun 2009 02:43:10 +0000

Its not just Pentax K1000. I just shot an AGFA black&white negative film with a Praktica BX20 with a Heliopan circular polarizer filter on the lens. Each shot was consistently overexposed with at least two stops. There must be something with cp-filters that tricks the TTL-metering badly. (Even though it should not, thats the whole point of using circular instead of linear).

By: David

David — Tue, 19 Aug 2008 17:27:51 +0000

Nice work. The ones that did come out are great shots – I esp. like the architectural salvage shop. Comes off just like a browntone.

By: boombadeus

boombadeus — Tue, 19 Aug 2008 12:31:18 +0000

Albert, I agree it’s really weird that they’re overexposed. If anything, I’d expect the TTL meter to get faked out the opposite way, to lean towards underexposure.

Travis, now that you mention it, I do remember you had a polarizer on it. Since I was borrowing it, I didn’t remove it.

Hmm. Well, that one was also overexposed, but not as much as the others, and salvageable in my photo editor. I wonder if the circular vs. linear has anything to do with it. I understand that CP filters have a greater filter factor than regular linear polarizers. Maybe that’s why the result with your filter was overexposed, but not as drastically?

It’s still really strange. The TTL metering on my DSLR isn’t faked out by the CP filter…

It’s definitely time to do some metering comparisons with the K1000. I’d never run ISO100 film in it before, so maybe it’s somehow more off at 100 than at 400.

Hmmm…

By: Travis Truman

Travis Truman — Tue, 19 Aug 2008 11:46:20 +0000

My 28mm that you used did have a polarizer on it, probably not a circular one. I don’t remember if you took it off or shot with it on.

Sounds like its time to do some metering comparisons between a known good meter and your K1000.

By: albert

albert — Tue, 19 Aug 2008 04:35:53 +0000

i think a C-PL is at least 1 stop of light loss and from what i’ve quickly read, the K-1000 does have TTL and therefore should be automatically compensating. but oddly, it’s overexposed instead of being underexposed (if the TTL meter wasn’t compensating).

i’d suggest taking a look at the K-1000 user group on flickr.