Quite right They must have money to burn Ha! Ha! Olympus use 3 as well. The 400mm Tokina f/5.6 M42 I have only has 3 on the lens mount. I can pick it up and shake it about by the end and I don't think there is an awful lot of force involved. Screws especially high tensile are quite strong. The average guitar string is tensioned to about 25/30 lbs continuously plus more when its being bent/pushed.

Most lens mounts are only held on with 3 or 4 small screws anyway. There was an uproar in the 70's when Canon replaced their breech mount held with 4 screws with a lighter one using just 3

I use a Tokina 400mm lens that hasn't got a mount on it without any problems.

I don't think the force is all that high. If you can pick the lens up by the K mount using just your forefinger and thumb with the lens horizontal there can't be much force. If the lens gets bashed against something.... that's a different story.

This seems to be a duplicated thread?

If you can find one the Pentax-F 24-50mm f/4 covers all the normal wide angle lenses and standard lenses and it's sharp even at f/4

This was predicted in the mid-seventies by people who said
"Never buy a camera that relies on batteries"

It's already posted Gary..... looks good until you see:

Best D-SLR Expert: Olympus E-5 Obviously not looked at
the DxOMark

I also saw on another forum that 4/3rds lenses start suffering
from diffraction at f/7.1

There's not much difference. I've got 3 MX's and I've just had another look with the standard screen. The MX and Super A are very close in daylight. It was in tungsten light I looked last night. Even looking through them with a Pentax Digital Spotmeter there isn't much in it. They both have a very slight warm colour cast, might be due to age. Looking in a darkish room using them like an extinction meter I can still see a wicker basket with the Super A that I can't quite see with the MX, but hardly a big difference though. I suppose I should also compare then with a darker lens such as an f/4? The apparent distance of the Super-A screen suits me better.

Tried the split-screen on the edge of the door again and you can actually move up and down the door and it doesn't alter.... so not very accurate

The special LX screen I've got is the SC-69W/C v2 made for the Pentax LX 2000. Apart from the extra microprism collar and being better suited to longer lenses it looks the same brightness as the standard MX screen.

Looks like they found a new toy

Wow! them animals make our pigs look gorgeous!

I like it! I bet you can't hear the shutter with
that soundproofing!