Applied Mathematics to Holga Cameras

17

As I like to use science for good Lomographic reasons, let me present you the External Shot counter!

Sometimes, you cannot see the shot N° from the little window behind so I thought to make an external shot-counter. When you roll your film, you turn the wheel of a certain angle to fall on a correct shot position. This angle reduces as the diameter of the roll is increasing. Here, I used an empirical analysis (empirical means by experiment) to determine the good angles (more than 360° rotation before shot 12) needed to turn the wheel in order to make 12 separated shots on any film.

To make measurements of the wheel angles, I placed a white sticker on the wheel, used my Holga normally (by watching shot numbers in the little red magic window) and noted every position of every shot on the sticker. I did this for four films (Provia, Sensia, Velvia and a strange one I forgot the name). Then, I calculated a mean rotation angle over all films to obtain a mean measurement applicable to all films (I hope) by applying a third order polynomial regression. Finally, I produced an external shot counter with Photoshop, printed it, and stuck it on the Holga wheel. I tried it many times. IT WORKS.

As science is about sharing information, I put here a copy of the counter. Print it with the good size, stick it on your wheel and shoot. This is useful when you do 70 mm and you can’t open the red window (‘cause 35 mm are transparent, you know…)… And same thing for 220 film, note that after the twelfth shot, you just make a 360° rotation of the wheel…

written by stouf on 2009-03-29 in #gear #tipster #science #underwater-holga #holga #220 #35mm #70mm #counter

17 Comments

  1. kylewis
    kylewis ·

    That's fantastic! all beyond me, I think that's why I like random holgaramas... of course all that overlapping is planned!

  2. stouf
    stouf ·

    Oh thanks for publishing that LSI ! I wasn't expecting it... : ) ... And I'd be curious if someone could test it for the Diana...

  3. stouf
    stouf ·

    Oh and if you don't like its design (I'm not good at that stuff) just keep the triangles position and remake you version of it ! Lomo on !

  4. azurblue
    azurblue ·

    Smart idea !

  5. kirri-joy
    kirri-joy ·

    fan-bloody-tastic idea stouf. i always screw up 35mm in my holga, in the end i give up counting clicks. this is great!

  6. kirri-joy
    kirri-joy ·

    this is also great for 3200 ilford b+w...its super hard to see the faint numbers in a dark pub at night.

  7. dogma
    dogma ·

    Cool I love math :)

  8. lomosexual_manboy
    lomosexual_manboy ·

    Stouf, you are a wizard. I'm going to use this for sure.

  9. ebolatheelectricmonk
    ebolatheelectricmonk ·

    Just what I needed! My rule of thumb (1+1/3 turn at the beginning, a little less than one turn at frame 12) works only partly.
    That's much better!!

  10. friskas
    friskas ·

    how about for Diana F+?

  11. itsdebraanne
    itsdebraanne ·

    i'm so confused

  12. stouf
    stouf ·

    @itsdebraanne Mmm sorry to hear that... Here's an example: After you took shot N°1, turn the wheel a full 360° until reaching again mark N°1. Then turn the wheel until you reach mark N°2. You can now take shot N°2. : ) Is that clearer ? : )

  13. itsdebraanne
    itsdebraanne ·

    @stouf i think? haha. do i turn the wheel a full 360 after shot No. 2, then turn to mark 3?

  14. stouf
    stouf ·

    @itsdebraanne: Exactly ! : )

  15. djramsay
    djramsay ·

    fantastic

  16. djramsay
    djramsay ·

    sorry would this work for the 120 wpc?

  17. stouf
    stouf ·

    @djramsay Yep. And I've made one for the WPC (www.lomography.co.th/magazine/reviews/2011/07/05/holga-wide…)

More Interesting Articles

  • Fed 5 - My First Analogue Camera in 2015

    written by whimsicalgrid on 2015-01-23 in #reviews
    Fed 5 - My First Analogue Camera in 2015

    Before the end of 2014, my girlfriend took the plunge of purchasing a rangefinder camera from eBay as a late Christmas gift for me. Let me present to you: the Fed 5. The Fed 5 has been known as a copy of the Leica M3 rangefinder camera. It is inexpensive compared to Leica models. So what are my experiences of using the Fed 5? Read on to find out more.

    6
  • LomoAmigo Galleries: Asher Moss shoots with the Diana F+ (NSFW)

    written by Jill Tan Radovan on 2014-05-28 in #people #lomoamigos
    LomoAmigo Galleries: Asher Moss shoots with the Diana F+ (NSFW)

    Nostalgia, intimacy, and urgent yet understated sensuality – are elements that are evidently part of Asher Moss’ work. Moss’ “Models in the Morning” series caught the attention of many, including the folks here at Lomography. The resolution: let Moss try out a few Lomography cameras, and wait for the visual intimacy to begin. In this first segment of LomoAmigo Galleries featuring Asher Moss, we present to you the photographer’s shots using the Diana F+.

    1
  • Lubitel 166+: A Review By A Four-Month Newbie

    written by hervinsyah on 2014-09-10 in #reviews
    Lubitel 166+: A Review By A Four-Month Newbie

    Many thanks to Lomography for choosing me as one of the Win Your Wishlist Rumble 2013 winners. Now, I can finally try using this precious camera.

  • Shop News

    Color Your World with Colorsplash Camera

    Color Your World with Colorsplash Camera

    At 30% off you can now color your analog images with 12 different color gels. Experiment with 35mm slide film and play with the built-in color flash for the most intense colors!

  • Diana F+: A Dozen of Possibilities – Part 3: The Wide-Angle Lenses

    written by dopa on 2014-07-25 in #reviews
    Diana F+: A Dozen of Possibilities – Part 3: The Wide-Angle Lenses

    I just love the Diana F+ camera. As I continue my series of tribute articles, let me introduce you to Part 3: The Wide Angle Lenses.

  • Simple Color Gels or Filters Holder for the Diana Mini's Flash

    written by grungyjodie on 2014-04-25 in #gear #tipster
    Simple Color Gels or Filters Holder for the Diana Mini's Flash

    I've always been looking for a really simple solution to hold my color gels of my Diana Mini's flash WITH the camera and make them easy to grab when I want to use them. I also wanted something to keep them from getting damaged. Let me show you how I found a simple way to make it.

  • Fresh from the Lomolab: Yoga for Charity in Cernobbio

    written by sirio174 on 2014-06-25 in #lifestyle
    Fresh from the Lomolab: Yoga for Charity in Cernobbio

    A few days ago, I received from the Lomolab the scans of a roll that I used a couple of weeks ago when I documented a Yoga for Africa public demonstration in Cernobbio, a small town near the city of Como, using my Sprocket Rocket. In this article I'll explain to you the reason that led me to choose this camera. Read more after the jump!

  • Shop News

    Recognizable Images of Petzval

    Recognizable Images of Petzval

    You want your subject be the center of attention? Petzval lens are recognizable for sharpness and crispness in the centre, strong color saturation, wonderful swirly bokeh effect, artful vignettes and narrow depth of field that will make your subjects stand out!

  • My First Indisposable Project

    written by stitch on 2014-07-24 in #lifestyle
    My First Indisposable Project

    The idea behind this project was to shoot 24 moments in one week's time using a disposable camera. Incidentally, a friend from Seattle sent me two disposable cameras so I was finally able to participate. Disposable cameras aren't sold in Manila anymore. I timed my shoot during the week wherein I had to go out several times, also hoping for good weather.

  • Making a Slit Scan Camera

    written by stratski on 2014-07-31 in #gear #tipster
    Making a Slit Scan Camera

    Looking for a fun new experiment? Like those old fashioned finish photos? Then let me introduce you to the wondrous world of slit scan photography.

    3
  • Bite-Size Fiction: The Memory Pill

    written by Julien Matabuena on 2015-02-15 in #world #lifestyle
    Bite-Size Fiction: The Memory Pill

    Someday, getting rid of unwanted memories will be as easy as popping a pill and waiting a few hours for the desired effect to kick in. Literally a bitter pill to swallow (you'd think that with all the advancements in science then, they would've already made, say, fruit-flavored ones like the vitamins you loved as a kid), sure, but effective nonetheless.

    4
  • Shop News

    Sit, Stash & Fold

    Sit, Stash & Fold

    Get both appealing LomoDices for your home! These cardboard cubes can be used for different things – they make great, stylish seats but you can also stash small items inside and fold them for storing!

  • Introducing The New LC-A+ Instant Camera!

    written by shhquiet on 2014-08-01 in #news
    Introducing The New LC-A+ Instant Camera!

    The Lomo LC-A+ is famous for a good reason: it delivers an amazing, distinct effect that makes every photo a unique masterpiece. Now you can enjoy this in an instant with the new LC-A+ Instant Camera!

  • Flower Photography Tips

    written by sandravo on 2014-04-15 in #gear #tipster
    Flower Photography Tips

    Spring is the perfect time to load up your camera and head out looking for flowers to shoot. Let me share some personal experience on how to improve your shots.

    2
  • Gritty Urban Sights Shot with the Diana Baby 110

    written by chooolss on 2014-10-23 in #lifestyle
    Gritty Urban Sights Shot with the Diana Baby 110

    Slip a tiny camera into your pocket when heading out to the streets - you just never know when a good photographic opportunity would present itself!