Originally posted by tkossally Hi RioRico, Thanks for the much appreciated info..100 lenses, You need not worry about me catching up. I have 4.
Four. That's a good start.
Oh yeah, 100 sounds like a lot, but if I don't count the three most expensive zooms, they average about US$25 each. That's average. Some of my best were under US$10: Vivitar-Komine 90/2.8 macro ($3), Takumar 55/1.8 ($7), Nikkor 85/2 ($9), various enlarger lenses for $7 each, etc.
Quote: Will look for a M42 enlarger etc on EB. Any other source you use? What about a reverse adapter. I have 2 M50..f2 and f 1.7.
Many enlarger lenses are M39. An M39-M42 adapter usually costs ~US$3, and for using anything on PK or M42 extension (bellows and/or tubes), a cheap and safe flanged M42-PK adapter for US$5 works great. I get all mine off the bay. Sets of simple tubes are now usually around US$8; I just bought two more each of PK and M42. PK or M42 bellows can often be found for under US$40.
Using enlarger lenses on bellows: The bellows have a certain thickness. Lenses longer than 75mm can usually focus to infinity and can thus be used for general non-macro photography too. Shorter lenses (<75mm) allow/force you to work close. Longer lenses (>125mm) may require tubes as well as bellows. No lens can focus closer than its focal length. Keep all that in mind when buying stuff.
There are two kinds of reverse adapters:
mount, and
thread. Both are very cheap, usually around US$5. With either, you'll find that your working distance is VERY CLOSE, like under two inches. If you're shooting in a studio with a light tent, great. But they're more work than using non-reversed lenses on extensions.
Note: MAGNIFICATION COMES FROM EXTENSION, NOT FROM REVERSAL. Reversing a lens gives a sharper image; but extension is what magnifies.
A
mount-reversal adapter has a thread on one side and a PK mount on the other. ANY lens from ANY maker, with that size thread, can be reversed and used for macro work. I've used reversed Canon, Konica, Minolta and Leitz lenses this way. Your M50's will work fine; they have aperture rings. Use a mount-reversal ring if you have PK bellows and/or tubes. Get used to working at two inches.
A
thread-reversal ring has male threads on both sides, used for stacking lenses. Let's say I have a 100mm prime and a 50mm prime (both with 49mm threads), and a 49mm thread reversal ring. I put the 100mm on the camera -- it's the PRIMARY. I screw the ring into its threads. I screw the 50mm lens into that reversa ring -- it's the SECONDARY. Magnification is P/S or 100/50 or 2:1. If the primary is 105mm and the secondary is 35mm, M= 105/35 = 3:1. Stacking lets you get GREAT magnification. But your working distance is still under two inches.
Those are some of the basics. Have fun!