Hey everyone!
I've finished my first photography-related application for the iPhone!
Expositor 1.1 is a handy slide-rule based exposure calculator for photography.
Use it in the field if you don't have a light meter handy, or use it to train your big ol' brain to be its own exposure calculator. Expositor is here to help you shoot great pictures!
Normal use:
Pick the situation you're shooting, then slide the ruler until your camera's ISO is lined up next to it, and every combination of F-stop and shutter speed to the left will get you close to a perfect exposure.
Advanced use, settings based on artistic intent:
For a more creative example, let's calculate shooting sports on an overcast day with a shallow depth of field (F4) to isolate the subject, and a fast shutter (1/500s) to stop motion. Match the F-stop and speed, then check the ISO value next to 'Heavy overcast day' to see how sensitive your camera needs to be, in this case, ISO 200!
Advanced use, calculating ND filter requirements:
Say you're shooting a waterfall on an overcast day. To get a soft look, you'd like to use a shallow depth of field, F4, and drag the shutter a bit to blur the water, 1/4 second. Slide the ruler (touch and drag it) until F4 is lined up next to 1/4 second.
Notice that there's no ISO value listed next to 'Heavy overcast day'. That's because the scene is much too bright for you choice of aperture and shutter speed, but all is not lost! You can use the exposure compensation slider to calculate the density of the ND filter needed to bring the ambient light down to a workable range.
Slide the exposure compensation slider until an ISO supported by your camera (for this example, ISO 100) is next to 'Heavy overcast day'. This should put the slider value at +6 stops, meaning that at ISO 100, F4, and 1/4 seconds, the scene is six stops overexposed. Just grab enough filters to block six stops, put them on your camera, and you're ready to shoot a proper exposure with the look you want!
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So! Two things: I'd really love to get some feedback on this app, and if anyone has ideas for new features they'd like to use in the field, PLEASE let me know! I can roll out new versions absurdly fast, so you might just get what you're looking for.
Also, please let me know if this post is too commercial for DPC. I just saw someone post about their new camera strap store, so I went for it. In any case, I'm not asking you to buy a copy, just to take a peek and imagine. And review the description. And then tell me what you want more of!
Heck, if you're really awesome I might even float you a promo code! :)
Do you have an iPhone, Drew? How about you, Langdon? Do ya? You guys definitely get a free copy. :D
Message edited by author 2009-05-21 14:57:54. |
