It is once you realise that all the 0.85x finders are mirror and all the 0.95x finders are prism.

Other than that one fact I can't think of an important detail which isn't on Bojidar's site, that place is a gold mine.

What details are you looking for?

In terms of the finders, So far Pentax have only used 3 finders in their DSLRs

0.95x, 95% Pentaprism in
*istD, *istDS, *istDS2, K10D, K20D

0.85x, 96% Pentamirror in
*ist DL, *ist DL2, K100D, K110D, K200D, K-m, K-x

0.92x, 100% Pentaprism in
K-7

I agree with Rob there, the uses I'm thinking of are the sort of thing where the news reader mentions a story which interests me and I want to look up more without missing the rest of the news.

I'd actually really like to have something like that, but I'll wait 4 or 5 years until I can pick something similar up for ~£50.

I have a polariser, which I spent most of my recent holiday in Gran Canaria kicking myself for forgetting to take with me, and an ND 4x for slow shutter speeds in bright conditions (waterfalls, beaches, that sort of thing).

I haven't had a chance to play with one, but I've seen a couple out and about and of course I've seen the adverts on TV.

My personal conclusion, it looks seriously cool and with the right applications it will certainly be a huge success. I have no use for it however, so I wont be buying one.

Actually that's not true, it would sit on my coffee table and be used to browse the net on occasions when I couldn't be bothered to boot a laptop, but that's not worth the sticker price by a long way.

There are several reasons I'd be calling Chris at SRS or Barry at Leon-Paul before I'd go near the Apple store.

I think the lens batteries for the AF 35-70 are AAAs, although I've never managed to get hold of one to match my ME-F so I don't know for sure.

The AF circuits in the ME-F are also pretty power hungry, it has twice as many button cells as the rest of the M series and still munches them at a rate of knots.

oooo you reminded me,

Good:

Pentax SMC-F 35-70 - Yes it was the kit lens in the SFX era, but its tiny and shockingly good for what you pay for one. Secret bonus tip, reverse it and it makes a surprisingly good cheap introduction to macro.

This is tricky because a lot of lenses which I bought for under £50 now fetch higher prices but:

The Good:

Pentax SMC-M 50mm f/2 - Bottom of the range keeps prices down but like almost all 50mm primes it's actually a fine performer.

Pentax SMC-M 200 f/4 - I got mine for £30, suspect it's now a little over the £50 but there are a couple on fleabay BIN for £79. Faster than a zoom and nice performance.

The Bad:

Centon 500mm f/8 Mirror - I only paid £50 for mine brand new, and it wasn't worth it. Bearing in mind that the SMC-FA 80-320 isn't that great at 320, I still got better images by cropping the 80-320 than from the Centon 500.

Sirius 18-28mm zoom - Possibly the worst lens I've ever owned. Almost impossible to focus, horribly soft at all apertures and all focal lengths.

alas as far as I know Canon lens to Pentax body is a practical impossibility due to differences in register distance and throat size. Pentax lens to Canon body works(ish), but not the other way around.

Nice idea Ben, I wont be joining in as this really isn't my style but I hope it attracts some great entrys.