The other day I saw this link from dsvilko and thought it was a really good idea. He uses the sled from a cd or dvd player to accurately position a subject for macrophotography. If you have never tried it before, then shooting something macro usually means that there is very light coming in to the camera and it makes manually focusing something (by twisting the lens) almost impossible.
Initially I wanted to directly duplicate dsvilko’s rig, but the sled I have doesn’t have the belts traveling in the same direction as his, so there was no easy way for me to replace the dc motor with a stepping motor. I decided to just roll with the punches and stick with what I had. By limiting the amount of time the motor was on I could build a reasonable facsimile of a repeatable step. I am currently moving the sled in 20 millisecond periods.
I directly soldered wires to the existing motor’s terminals. I zip tied them to the sled and then started work on the arduino side of things. I am using a l298 h bridge motor driver to control the motor. It takes 3 wires from the arduino. Two wires control the direction of the motor, and the third turns it on. more after the jump
I’ve been getting more and more into my camera lately. The other day I was browsing Craigslist and I saw an interesting ad… Skip a few steps and I ended up with a bunch of new lenses, an old film body, and a lot of other doodads. Just because I had fun shooting it, you will find pix of the new lenses below.
I’ve also been reading the strobist a lot lately, and I was trying to get a decent light setup going. Trying is the most important part of that sentence : )
55mm nikon macro
I’ve been shooting some time lapses with this one lately. More to come on that.
I juts got a macro tube in the mail. It’s basically a dumb (ie you need to be on full manual mode-no metering or AF) piece of aluminum that moves the lens further away from the camera body. Doing so it decreases the minimum focal point.
Basically it means you can get really tight up on stuff and shoot close ups. Here are a few test shots
extension tube for macro photography
The macro tube has 3 different sized rings that thread into one another. That way you can roughly control the distance between the lens and the camera. The three shots are taken with the three rings on. Here’s a photo (ripped from deal extreme)