Mini App Review: Exposure Assistant for iPhone

Discussion in 'Photography & Video' started by plasticbastard, Sep 8, 2009.

  1. plasticbastard

    plasticbastard Member

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    I've been trying to wrap my head around the whole thing about exposure and apertures and how they mathematically relate, but being a non-egg head when it comes to numbers and maths, have struggled insanely. I understand the theory, but as soon as I start looking at f16 for 4sec as the same as f14 as Xseconds my eyes roll around wildly and froth forms in the corners of my mouth. Sometimes I go so far as to turn my head around a full 360 degress while babbling incoherently.

    So, while bumming around the App store in iTunes I stumbled upon a nifty calculator!

    Exposure Assistant. It cost all of $1.19 and does all those fantastic little sums for you.

    All you have to do is, in the top, set the exposure setting you want to start with, and then in the bottom, select the column you want to calculate for, and start changing the other two settings to see the outcome!

    There is a small bug in that when your restart the program, it doesn't calculate the first setting correctly, but you can get around that by making sure all the values are the same.

    In the screenshot below, you can see the layout is, from left to right: Time, f-stop, ISO.

    Very handy little tool for those times you can't figure out the math in your head if you're like me :)

    [​IMG]
     
  2. baar01

    baar01 Member

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  3. chilloutbuddy

    chilloutbuddy Member

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    Nice, no reason not to have it for $1.
    Dont most lightmeters do the same thing?
     
  4. baar01

    baar01 Member

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    I can't afford a proper light meter. So, I find it useful to meter this way for long exposures at night.
     
  5. SyN

    SyN Member

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    whats wrong with just counting clicks in manual mode?

    ie, if i click 4 times to change f/8 to f/4 then id lengthen the shutter by 4 clicks?
     
  6. FB008

    FB008 Member

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    try metering for really long exposures. i usually do ISO6400, 30 sec at max aperture as a test exposure, get it approximately right.

    Then try finding the equivalent exposure time at ISO200 + F/8. The program comes in handy so you don't have to worry about doing the maths
     
  7. SyN

    SyN Member

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    ok so i see how its useful beyond 30second exposure.
    but its not that difficult anyway. iso 6400 -> iso 200 is 5 stops. then say you close your lens down 2 stops. so you have 30second and need more 7 stops. 1min, 2 min, 4 min, 8 min, 15min, 30min, 1hr!

    so iso6400 f/4 30s gives the same exposure as iso200 f/8 1hour

    all the numbers are neat anyway. (i do admit i have to use my fingers to count though lol)
     
    Last edited: Sep 8, 2009
  8. baar01

    baar01 Member

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    Haha too much maths for me. I rather pay $2.50 and have it done for me :p
     
  9. SyN

    SyN Member

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    well? i rather count with my fingers like real dumb men do rather than poking at a flashy iphone!
     
  10. ^catalyst

    ^catalyst Member

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    technically its still counting with your fingers!
     
  11. OP
    OP
    plasticbastard

    plasticbastard Member

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    LOL @SyN - whatever floats your boat. Some of us just don't like having to figure all those stops and stuff out.

    @baar01 - I think I had come across that in my searches too. Might give it a burl as some of the other features look handy.
     
  12. Lukey

    Lukey Member

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    I downloaded worms for $6, so I guess this is a bargain at $2.50 :p
     
  13. bubblegoose

    bubblegoose Member

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    Gosh, I have always been wondering if something liek this was available, I have the electronic shutter release, but always used to just guess. This will come in handy :thumbup:
     
  14. chilloutbuddy

    chilloutbuddy Member

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    I know (well, I dont know really, but if you say so...)
    Just asking because I'm curious, dont lightmeters do the same thing?
     
  15. bubblegoose

    bubblegoose Member

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    holy crap, just got this. A couple of other cool functions? its practically bursting at the seams with them!
     
  16. isaaus

    isaaus Member

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    Just downloaded Photobuddy and its awesome, someone port it for other phones too :thumbup:
     
  17. Fred

    Fred Member

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    The hyperfocal distance calc would be handy.
     
  18. OP
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    plasticbastard

    plasticbastard Member

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    PhotoBuddy's hyperfocal distance isn't all that useful for those people that have medium format (or larger format) cameras.

    Then again, you really tend not to worry about hyperfocal distances the larger the format, especially if you've got the full range movements on your camera, like most LF camera's do.
     
  19. NVRENUF

    NVRENUF Member

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    awesome thanks I just bought the app too.

    now to play with it
     
  20. Sir Ghallahad

    Sir Ghallahad Member

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    Alosu just got PhotoBuddy and its pretty neat. I like the sunrise/sunset thingo because im lazy and never take notice of when the sun actually goes down.
     

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