I have a sony alpha 100. I want to make macro images in my camera. I will use Adobe Photoshop later if I want to change something. What is the difference in the 50mm f/2.8 and a 100mm f/2.8. I am using diopters +1,+2,+3 and 3 auto extensions with a 3.5-5.6 sony lens to get the close ups I want of flowers. The lens of my camera is right on top of the flower with this set up. I wonder if the 50mm or 100mm f/2.8 would work, but I don't know the difference in them. Thanks for any help. Geo
There are two difference between the 50 and 100 macro lenses. One is the focal length and the other is the working distance.
For shooting flowers, the 100 might be better because you won't have to set up so close that you cast a shadow and effect the light on the flowers.
For shooting still lifes, I prefer using the 60mm macro (I use Nikon) because I have a limited working distance in the room that I shoot in. But for outside work I would prefer the 100mm.
Though it might not make much difference when shooting flowers, there is a magnification factor. If your camera has a 1.5 magnification factor, your choices really becomes a 75mm or 150mm equivalent.