Having upgraded from my Canon EOS 650,1 took the plunge and recently bought a second-hand Canon EOS 40D. When I purchased it I was told that it had a different focusing screen from the one which it originally came with. I've never considered this to be a problem, though I'm curious as to what benefit I would get if I tried to use one of the others. Any ideas?
□ Matt replies: There are three different focusing screens available for with the EOS 40D; the Ef-A Standard Precision Matte, the Ef-D Matte with Grid and the Ef-S Super Precision Matte. The first one comes with the camera as standard, so it would be one of the other two which you have in your EOS 40D. If it has a grid then it's the Ef-D screen, which is useful for framing straight horizons and for architecture. The slightly darker Ef-S screen, meanwhile, is optimised for use with wide-aperture lenses, and more suited for macro work where you may be focusing manually. Many photographers do find additional screens helpful if they tend to only shoot one subject type - so if you only shoot architecture and you have the Ef-S screen in place I'd certainly suggest you look at the Ef-D (and vice-versa). You should expect to pay in the region of £25 for a new screen.
Is there an adaptor for my Zuikos?
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