I would like to extend my canon 100L Macro with extension tubes.
I have a few options but like to hear what option you would choose and why:
1. Canon 5D MK III + 100L+canon 12mm+canon 25mm
2. Canon 5D MK III + 100L+kenko 12mm+kenko 20mm+kenko 36mm
3. Canon 7D + 100L+canon 12mm+canon 25mm
4. Canon 7D + 100L+kenko 12mm+kenko 20mm+kenko 36mm
Of course I can use extension tubes also single instead of stacked
Price Canon vs Kenko tubeset is similar: around 200 euro
Kenko is excellent, get a 3 piece set and you will be fine. I have a cheap plastic set that works just fine for smaller lenses. I've had Canon, Kenko, and now a cheapie plastic set, all worked equally well for me. I would not buy the cheap set, they came with a used camera and since I use them maybe once a year, I sold the Canon and Kenko tubes and kept the cheap ones.
You want to be sure its the type of set that has the electrical contacts, there are low cost EF tubes without contacts, and then its a issue to focus or set the aperture.
The electrical contacts go straight thru to the lens contacts, no electronics. This means the camera will not know the tubes are there, its like you are hooked directly to the lens.