dosk wrote:
>
> Fr Skip
>
> Had a great time earlier tonight strolling thru town (Freehold, NJ) trying
> out some night photography experiments.
Sounds like fun.
>
> Question about "pushing" film. I don't quite understand it... Let's say I
> suspect the pictures I took tonight, with ISO 800 film and with the camera
> automatically set to ISO 800 also, will be too dark. Would I then ask the
> lab to develop the roll at an ISO 1600 setting?
You could. Why do you suspect that? Did the meter pretty consistently
read -1? Were you in manual mode? If not, camera shake may be more of a
problem.
> Or should I have set my
> camera's manual ISO setting to 1600 while using the 800 film, before I ask
> the lab to do the "push"?
That would have better than guessing afterwards.
> And, is a "push" irreversible? Once the negatives are developed that way, if
> they're too over-exposed, then I cannot go back and re-obtain an 800
> development again, right?
Right, though a 1 stop over-exposure is probably less fatal than a 1
stop under-exposure for print film.
> So then how do you know whether to "push" or not?
Well, lets say you load your 800 speed film into your zx-m with a
50/1.4. You meter the scene, and at 1.4 you get a shutter speed of 1/15.
What are you going to do? Can you brace yourself against something and
maybe hand-hold at 1/15? Some people can...
If not, you can set your ISO to 1600, giving you a more manageable speed
of 1/30, though even at that speed handholding a 50mm is tricky.
If you're about to take a pic of something seriously newsworthy, forget
the artistic considerations and set the ISO to 3200 for a 2 stop
push...or you could whip out a roll of b+w tmax 3200 and shoot it at
25,000. Then you could shoot at 1/60 and f/4. ;)
The more you push, the higher contrast, grain and worse color you'll
get. It's a trade-off you have to figure out for yourself.
>
> But perhaps it's better to always chance under-exposure, as I could always
> lighten my prints up some with the computer, right?
Not a good idea...underexposed print film is not a pretty thing.
If it's too dark dark for TMAX 3200 and a 50/1.4, go have a beer!
tv
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