can I view old camera negatives not 35mm

Yes you can. However, you will need some way to illuminate the negative from below. I use a light table that I made myself many years ago. It is just a wooden box with a white 1/4 inch plexiglass top. Inside the box are two fluorescent lights. I use the box with the Lumi-Loupe to examine slides and sometimes negatives. You can search Amazon for "light table" and find some ready-made solutions. They make some tables that use LEDs and I might even buy one of them myself as they are more compact than my current set-up! Good luck!

Does the glass/plastic base unscrew?

The glass/plastic base does not unscrew. It is rather like looking for a more definite detail when viewing this unit. The way a diamond dealer would look for any minor to major crack or deminisce in a diamond per say.

Does it work good for reading coins?

Tom the problems I had when I tried using it to read coins is its pretty hard to put enough light on the coin without having to lift the magnifier off the coin. Then you're field of vision is even lower, if that's possible. For example, reading the date on a dime, and you can appreciate how small the date field is on a dime, I found myself having to use a flashlight (LED hi beam of course), lifting the Carson scope slightly, and moving it slightly in order to read the entire date. It drills down just that precisely. Now I could put the entire date within its field of view, but to read against the glare I found myself shifting it slightly so that I could read the whole date while minimizing the glare...If I had not purchased it, and know what I now know about this lumiloupe, I would shop around for something perhaps a little better. Now the 5x scope, it was 5 times the size of this 10x, and it zoomed in quite well, but again it was only 5x magnification. I would find another 10x with a larger base dimension. Hope this helps!

would this be a good magnifier to look for bugs on my plants? If not, please suggest alternative.

I bought it to see some small prints in dictionary for example, and negatives ( old ones). For looking at small bugs like aphids and mites, it should work fine. Bigger ones would be too scary. You have to get very close.

LL-20 10x LumiLoupe Stand Magnifier Loupe with Snap On Measurement Reticle

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