This adapter will enable you to buy some excellent lenses on a budget. For instance a Carl Zeiss Jena 135mm F3.5 lens. Excellent value!
3) Katz Eye focus screen. This will make your viewfinder look like this:
Don't forget to order the OptiBrite treatment! The KE screen and obtibrite will set you back quite a few $$$ but it is worth every penny. Manual focussing has never been easier.. Well, except if you add:4) Olympus ME-1 magnifying eyepiece.
It's not ideal, but in most cases it will help with manual focussing.5) Olympus RM-UC1 cable release.
I use it a lot when I'm working with a model. I focus my camera, and look to the model, not through the camera. It makes contact easier and the photographer isn't hiding behind his camera. Although with my size, hiding behind an E400 is impossible :)6) Camera armor for E-410. According to my olympus contact, the E410 and E400 are identical bodies. I've ordered a camera armor and we'll see if he's right.That's about it. Of course, don't forget your BLS-1 spare batteries!