I've only used the DFA so can't really commend on the others.

the WR version is optical the same as the normal one.
The WR has rounded aperture blades but it does so good as nothing for the normal out of focus blur, only when you've a highlight where you can really see the shape than you see a difference.
So the true reason to get a WR over the DFA is when you want better build quality for the rest there is not so much to gain.
Value for money I would go for the DFA without a doubt.

Also the WR doesn't have an aperture ring so can not be used on all film cameras.

The FA is missing the quick-shift and I find that a really useful feature for Macro, that's why I went for Pentax instead of the Tamron or the Sigma but those lenses are also very good from what I read but they are quite a bit bigger than the small Pentax DFA.

ps.
This a photo that I made on the first outing with the lens, only bought it the day before.
It's a raw photo converted to JPG without sharpening and I use the lens wide open at f/2.8
it's a full size photo so it's BIG link
I can provide you some raw files if you want?

He did it with a flash so that means capture duration of 1/10000th or so?

Forgot that I made this one.

Yes if you've it on AF.C but on AF.S when it has a lock it will not refocus till you release and press the shutter button again.

I've set the AF to work on the AF button only so with quick-shift lenses you can leave the camera on AF and you can manual focus but when you want AF you simply press the AF button.
This very useful for macro or lowlight condition where AF struggles, I can't live without it any more
Also you can use the AF motor to move the focus off the macro from normal to close up range without getting tired

I hope this helps.









K200D weights 630g (1.4lb) without batteries
K20D weights 715g (1.6lb) without and 800g (1.7lb) with battery
K7 weights 670g (1.4lb) without and 750g (1.6lb) with battery
KX weights 515g (1.1lb) without battery

edit: I know you didn't asked for it but I've added the KX and the K7 for additional reference

:
As far as I know it's a Fish-eye but made for 135 format so on APS-C the effect is less but still there.

Sigma and Pentax also make the 14 f/2.8 without the fish eye distortion and there is a DA 15mm f/4 limited Review

http://en.wikipedia.org/wiki/Grey_market
Sorry for choosing the easy way.

Amin has some amazing photos.

Hopefully indeed, non were born this year though so maybe next year.

I've some new noise reduction tools so thought I would try them out and see what I could make off it.
I almost never shoot at high iso so don't have many shots to try it on.

Air is compressible and when you go 10 meter (33 ft) down you've 2 times the atmosphere that means a bag filled with air will be roughly twice as small, at 30 meter you've 4 times the atmosphere.
It could work what you said.

I actually doubt the EWA can be use for real scuba diving, the problem is that the water pressure when you go relatively deep will press all the buttons or don't you think so?