On and off over the last 6 months I’ve been working on a 2-axis arduino controlled servo powered low-cost stage and usb microscope, inspired by Marc Dusseiller’s work .

Today I hooked up a ps3eye w/ an inverted lens and attempted to calculate its magnification factor. I also made some commits to the github repo for the project (the code’s currently in processing but that will be changing over the next month).

iPhone 4 pixel size

(via prometheus.med.utah.edu/~bwjones/2010/06/apple-retina-display/)

• iPhone1: ~176 x 223μm
• iPhone 3G: ~176μm x 223μm

• iPhone 4G: ~78μm x 102μm

• 326 pixel per inch (960×640)

ps3 eye inverted lens resolution

iphone 4 screen magnified by PS3eye w/ inverted lens

• 3088 x 2312 uM = 3.088 x 2.312 mm
• 640 x 480 pixels
• 326 ppi

• 4.25 x 3.18 cm

• 4.25 cm / .03088 cm = 137.63

• 3.18 cm / .02312 cm = 137.63

so magnification ~137x ?