(edit: sorry about the thread title, there isn't enough room...)
OK, so we know the m4/3 mount works with limited number of 4/3 lenses but they AF slowly (I am guessing the power current is not as stronge?)
And its alot harder for KFA mount to implement due to mechanical screw drive and mechanical aperture lever. How hard is it to make decently backward competible NX mount on the Samsung camera?
Let's forget about what Samsung is actually doing and pretend they do want to work with the KFA mount and esepcially the DA lenses. How can this work? I think people who have alot of teleconverters can answer this question easier.
Aperture:
for lenses that have aperture ring, if we have to press "meter" button before we shoot, doesn't seem like that big a problem. So basically its like what pre-A lenses work on the Pentax bodies now. With NX at lease you get to use old lenses from other mount. (BTW, does Nikon AI/AIS work the same way. You can use the aperture ring to control the aperture? What modern Nikon lenses has aperture control on the lens?)
Aperture lever:
well we need these in order to use the DA lenses. I don't see why shouldn't the NX mount use the same lever. It's a simple enough mechanic to implemet on the converter.
They probably can make the lever travel shorter and still be able to make a coonverter that works properly on the K mount. Is this possible?
AF USM contacts:
I think this is the most obvious option. They should use the same signal and pin number as the USM contacts. That way we get to AF "slowly". The question is has Samsung repackage any USM lens. We have 16-50 DA*, 50-135 DA*, DA17-70 and 55 DA* (both of the last two have no screw drives.) I don't know the situation of the new 200mm DA* and 300mm. I think it would be nice of Samsung to make the pins competible w K mount USM lenses.
I remember somebody said they will make the pins competible with the Canon EF mount. While is not a bad idea and I wouldn't mind being able to AF with all modern Canon lense. My question is, is it legal? IIRC, isn't the Sigma mount pin competible w Canon mount, but you have to physically hack the camera in order to make it AF the Canon lense. In order words, only a handful of Sigma bodies in the world can do it. OTOH, I remember Sigma's 3rd party lense are all reverse engineered. So can Samsung make a NX->EF adopter without being sued to oblivion? (Since I don't see any 3rd party is doing that for the m4/3 body its probably too much patent and copyright mine field to over come?)
AF Screw pins.
OK, first of all, is there a converter out there that can carry ovr the screw drive to the lens? If its doable then we know it can be done. Very important if you want to use the DA pancake lenses. But if Samsung is taking over the AF pin space with their own crap then I will hate them for it. Even if they are not offering a screw pin at least Pentax can make a version that can, in the future.
To be honest this is the least important thing of the 4 things I listed above. If there is decent 10X manual focus aid, I can live without the AF on most of the FA/DA lenses. The upside is you get to use lense from other mounts.
Last edited by whatever7; 03-07-2009 at 06:45 AM.