How to use Ac power to replace the Nikon D40 battery

I still haven’t gotten the grip I mentioned a few posts ago. I don’t know if I will. I have figured out a clumsy hack to get the job done and I might just run it this way, or perhaps clean it up a tiny bit.

This is the battery with little aluminum strips taped to it. The battery compartment is too tight for regular wires, so foil was the only way to do it.

aluminum foil wiring for battery pack d40

aluminum foil wiring for battery pack d40

This pic shows the “wires” coming out of the battery grip. I have alligator clips on a 7.3V 200Ma cell phone charger. I connect it to the foil and off we go!

battery grip showing aluminum "wiring"

The reason why I have the battery in there is because without it, there isn’t enough juice to fully actuate the shutter. I think that some kind/type of capacitor would also do this, but I’m afraid I don’t what kind would work.

Continue reading

quickie Nikon lens question

I was at my local camera shop the other day and saw this lens in a junk bin. Does anyone know why? It is a nikon 135 f/3.5 that has no apparent fogging, oil on blades or fungus. It focuses and shoots fine.

nikon135 front

nikon135 front

nikon 135

nikon 135



My initial thoughts are: it has the “ears” so it can only go on a few dslr’s unmodified. It also is full manual focus and aperture. Is it that the 135 is an odd length?

Here’s a newer faster version for $1,250!

The other weird thing is that someone has scratched off the nikkor name on the front of the lens. I should have asked the shop, but does anyone know why this lens would be $5? Thanks for your guesses!

Arduino Intervalometer for my Nikon d40

After seeing this project from cibomahto a while ago, I finally got my act together and bought a $1 IR led from radio$hack so I could build an intervalometer for my SLR.

For those who don’t know an intervalometer is, it tells your computer to take a picture every given interval. This enables you to shoot video with a still camera over a long period of time. Sometimes you have two intervals on fancy ones. Those allow you to use the bulb setting on your camera. Right now it has two potentiometers to indicate seconds and minutes between shots. It is run from a nine volt battery, and I expect it to have fairly good battery life. Only time will tell. The IR LED can’t take too much juice! It has a status led to show when it is firing (for trouble shooting) and not a whole lot else.


This currently needs a housing and a interface. I am debating the merits of a small lcd vs just using a printed label to mark the pot positions. It’s pretty much spray and pray right now. At least it is adjustable!

arduino d40 ir intervalometer

arduino d40 ir intervalometer


I’m thinking about getting one of these and eliminating the pots completely.


lcd shield from nuelectronics.com

lcd shield from nuelectronics.com

Which would end up making my project very similar to this one but for a nikon.


One last thought is possibly adding the functionality to use the bulb setting and then add a bracketing ability. Isn’t technology wonderful!