(iOS 5 removed zoom slider from photo app on 3GS; now 1000% worse for gig shots. Crop tool inconsoling.)
Pinch to zoom. Slider will reappear once you start with that. (Or at least, it does on the 3GS with iOS 5 I just tested on)
Wow, that's... non-discoverable. Especially since pinching doesn't zoom, it just exposes the slider. Thanks though!
Apple does stuff like that all the time. Only last night, I discovered 2-finger page scrolling on a MacBook track pad (I assume everybody knows about that, then again, maybe not). It happened accidentally at first, and it took me a while to reproduce. Then I realized it is very useful and rather elegant. Now, removing a widget is sucky, but at least the (un)pinch-to-zoom metaphor is already established.
Is there an official name for "unpinching?" And dontcha kinda wish they had used a 2-finger rotating motion for zoom (focus and aperture too)? Wait, that's what M$ would've done.
Other Macbook gestures:
3 Finger Swipe: Forward and Back in browser
4 Finger swipe: select between active programs in finder
See also http://www.the-iblog.com/2008/11/03/have-you-missed-any-macbook-gestures/
Oops, I meant http://support.apple.com/kb/HT3211
Yeeow, you take those with your 3gs? When I try to take concert pictures with my 3gs I either end up with a psychedelic blur that doesn't resemble anything or a black screen with indeterminate blobs of random colors.
You need to try harder, I guess?
That was written with "real" cameras in mind. Phone cameras are a whole other kind of pain.
Yeah, I manage to maybe try one or two shots before I give up and just enjoy the show. My wife's phone takes surprisingly good club shots, but my 3GS is just lousy. I'm impressed at what jwz manages with his.
Motorola--on their Droid 2, at least--took the non-intuitive "Use the volume rocker to zoom", and only recently added an on-screen [+/-] zoom button pair (in addition to the volume rocker functionality.)
Fascinating. The original Droid only has on-screen zoom, with settings in half-integer amounts from 1x to 4x. But it's discoverable if the sun isn't shining on the screen, rather than being Intuitively Obvious™ like the iPhone.
Huh? How's that non-intuitive? My S-E cameraphones and smartphones have always done the same, and it makes it feel much more like a compact camera in landsacpe mode; shutter release on the right, zoom buttons on the left.
The MotoDroid 2 is the first camera-enabled phone I've had (including LG VX8530, HTC Eris, MotoDroid, and two BBs) that used an external zoom rocker. (Yes, it makes sense, I just haven't had a previous phone that used that mechanic--or at least, not combined with volume.)
Ugh. Why zoom? Just crop later.
Because then I can actually see what I'm taking a picture of. And it's one click instead of a dozen.