Originally posted by Culture I will try this out and see. But I thought it was best to stay away from the far end of the focal length.
For more magnification with a close-up adapter like a Raynox, you need a longer focal length. There's no way around that. One or two dozen posts back, I gave the equation.
__________________________________
To calculate the magnification of any lens plus adapter, use:
M = F*D/1000 -- where M is magnification, F is host lens focal length, and D is dioptre of the add-on lens.
A +8dpt Raynox (or whatever) on a 100mm lens gives M = 100*8/1000 = 0.8x. On a 200mm lens, M = 200*8/1000 = 1.6x. Et cetera.
__________________________________
With a Raynox DCR-150 (4.8dpt) on a lens at 300mm, M = 300*4.8/1000 = 1.4x. The DCR-250 would have M = 300*8/1000 = 2.4x. Get around any optical weakness at 300mm by stopping-down to f/8. Or just crop the image edges.