Showing posts with label homemade lens. Show all posts
Showing posts with label homemade lens. Show all posts

Thursday, March 15, 2012

DIY lens, the making of.

Some of you have asked me about the homemade macro lens I use. It's really a makeshift device; I made it first, 5 years ago, to fit my first digital camera, a tiny Kodak EasyShare C533.

I had run across a couple of videos on YouTube, where people had put together a few old lenses, taped them into a tube, and created a passable macro lens, at least a bit better than the macro setting on their point-and-shoots. I took their ideas and modified them to suit my little camera.

The contraption consisted of two lenses from old binoculars, set in a card stock tube made to fit the barrel of the camera, slotted into a larger card tube the diameter of the lenses. The whole thing was wrapped in black electricians' tape to hold it together and to darken the interior.

The homemade rig, third edition. Not so carefully wrapped as the first.

Front view. The bluish mass is hot glue, easily removable for adjustments and cleaning.

Back end, with space for the camera barrel.

 I can see dust on the inner lens; how it gets there, I never know. At least I can fix this.

Really amateurish lens cap made from a plastic bottle.

It worked. Not well, but better than nothing.

A year later, I upgraded slightly to a Canon A720. The lens fitted, but did nothing until I reversed the rig. I took it apart to make it fit backwards and added a third lens taken from an old movie projector, which improved it.  I had to experiment with different arrangements of the lenses; direction, distance between them, and order.

On my next two cameras, Canon and Olympus, the DIY lens was no help; I stored it away. But it fit on the little Sony I got last year, and worked even better than on the first two. And now it fits the Nikon, but only held backwards again. I'll take it apart and rebuild the tube to fit.

I looked for those old YouTube videos; they're no longer to be found. I did find many videos saying that you could take an old 50mm lens, attach it backwards in front of the regular camera lens, and it will become a macro lens. I tried that; it doesn't work on any of my cameras. Maybe the next one. But maybe I'll just end up biting the bullet and buying a "proper" macro lens, instead. (Memo to self: stop buying antiques!)

The Sony with the lens attached. It just slides onto the extended barrel.

To test it with the Nikon, I photographed shells I had done a couple of years ago with the Olympus (on macro setting, no added lens) and compared the results.

From the Olympus. Cropped but not resized, colour corrected and sharpened.

From the Nikon with lens. Cropped to include only the original shells, resized  'way down to match the Olympus photo. No other adjustments. A slight angle creates blurring at the outside edges.

They look about the same, but the first one has no "give"; it blurs out at larger sizes, whereas the new setup can zoom right down:

Pink shell cropped from previous photo. I removed a bit of dust (should have dusted the box first), but made no other adjustments.

Price of my rig? 50 cents for the ancient binoculars at a garage sale, a buck for the third lens in Value Village. The electricians' tape and hot glue I had on hand. Card stock from a recycled box. About an hour's work for each rebuild.

Saturday, March 10, 2012

One eye, one wing.

I've had rather an exciting day, in spite of being shut in by heavy rain. First, I've been testing out a new camera, a Nikon CoolPix P7000; we bought it for Laurie because he wanted something small that would fit in a pocket, so he'd always have it handy. In the field, though, he wasn't too happy with its zoom. So I'll be using it for a desk camera, now that there's sand in the lens of my poor little Sony.

I tried it out on a few dead bugs I had on hand, alternating with the Sony for comparison. And I'm happy! It can use the home-made macro lens that I made to fit the Sony, with only a little adjustment. It's fast and sharp, and zooms in closer than the Sony. It has a shoe, so it can take the big flash, which gives better coverage. I haven't tried that yet; I will soon.

I've tried to get those wonderful compound eyes of some insects many times. It never works, and I've been wondering if I should invest in one of those arm-and-a-leg cameras with an extra macro lens. Maybe I will, some day. Not now; look what the CoolPix gave me on the first trial!

Eye of a fly I found on my car.

I hadn't figured out how to set the white balance yet, so the tiny squashed fly* I worked on didn't turn out too well; the Sony did better. It picked out the detail on the one surviving wing; look at this; I've never seen veins like these before:

Each vein is feathered, and the whole wing fringed.

I don't know if it will be possible to identify the fly, since the whole front end is battered, but maybe that wing will do the trick.

And just when I was putting away the cameras and bugs, I happened to notice my spider-in-residence acting strangely. He was just starting to molt, and I got to watch the whole process from start to finish; it took about 4 hours. Story tomorrow ...

*Looks like a mosquito. Thanks for the correction, Christopher!

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