This will be a bit long, but maybe it will be worth the read.
I've been checking out a macro rig using simply a binocular lens and a regular 50mm lens, and have posted a number of shots using it. After a few comments here and there and at least one other one already made up and taking pictures, I decided to post a decent description if anyone else would like to try it out.
Parts required - 50mm lens with 49mm filter threads. Removed objective lens barrel from 10x50 binoculars (that's the end that points toward what you're looking at.)
Check first to make sure the lens barrel will wiggle onto your 50mm lens snugly, if so it will work.
Ummm...use a junk pair of binoculars...
Grab a hacksaw and cut the barrel back about halfway, otherwise you wind up with a dark ring around the outside of your pictures, the threaded opening is too small. Clean it up with a file and some sandpaper. The threads are usually coated with a clear grease similar to petroleum jelly, it can be removed with acetone, it can take several cleanings with microfiber cloth, q-tips and acetone. Acetone is used as fingernail polish remover, it can be found in the cosmetics aisle but ONLY use it when labeled 100% acetone. Otherwise check with a hardware store.
Using it - Pretty much standard photography if you keep a couple of things in mind.
1. Movement - Anything that magnifies the image also magnifies motion. Practice can help you be more steady, finding something to brace against is highly recommended but a tripod can actually be a hindrance. Shooting a few inches away is not often possible with a tripod, and many of my favorite subjects are long gone before I even pick it up...like jumping spiders...
2. Focusing distance - A few inches. Break a new pencil in half, that should be about the maximum focusing distance. Maximum...So, if you move 1/8 inch, (about 2-3 millimeters maybe?) your focus is gone bye bye. But as little as a thumb bracing the lens with a finger on a handrail can be enough.
3. Depth of field - Practically nothing. At f8 a fly's tail is getting blurry if the head is in focus. At f4 you might see the middle legs good...
Getting that close - Happens two ways. Chance and intent. Chance is easy, just be there. Intent is not easy. Slow. Very slow. Slow is required, no sudden movements or noises. And hope for luck. Practice on flowers. They don't move much. Flowers in a light breeze can help you "see" your focus better too, and see what to look for. Shoot if you want, but occasionally also just look for a few seconds.
Now for the pictures...here's the rig, ready to shoot.
I didn't add the large picture intentionally, that should give you the idea.
Here is a grasshopper I shot yesterday, about 2 1/2 inches long. I had enough light to shoot at f16, and still had to underexpose it by raising the shutter speed. First the plain, everyday 50mm lens, this is a 1600x1200 crop from the full size picture, resized to 1024x768. (same 1600x1200 crop as the binocular lens head crop below for comparison) No other editing done on any of these shots, all are exactly as they came off the camera except for crop and resize.
Click image to view larger size.
Now a 3584x2688 crop of the next shot with the binocular lens attached. That's around 70-80% of the full picture, the largest size I can resize to 1024x768 and keep the ratio intact. Not a lot of difference when compared to the 1600x1200 crop above, but just wait...
Click image to view larger size.
This one is a 1600x1200 crop of the binocular lens close up. This guy let me get really close, but it took about 15 minutes of slowly edging closer, and he moved 3 or 4 times before deciding I wasn't going away so he sat here and put up with me for a while. Once you get accustomed to the focus, this is what this rig can do.
Click image to view larger size.
Notice the depth of field. This was shot at f16, and the antenna to the rear is starting to blur. That's less than 1/4 inch. In the full picture you can see the leg on the back side is blurring too, less than 1/2 inch.
Here's a backlit Aster I shot a few minutes after the grasshopper, focused on the hairs in the center, shot at f16 also. This flower is a bit over an inch, about the size of a quarter.
Click on image to view larger size.
There you have it. The macro rig I've been using and what it can do. If you decide to try it, have fun, I hope you get some nice shots..