Originally posted by Winder The thing is a new mount could still support K-mount with an adapter. You lose nothing by bringing in a new mount and a fully functional K-mount adapter. You gain the advantages of a modern lens system and design. Does the new K-01 support screw drive AF? Probably not, we are already limiting functionality.
I am less decided here. It is true, a new mount makes lenses for other systems available.
But a K mount forces Pentax to commit to make K mount lenses work flawlessly. I consider it a major failure of the industry that they release mirrorless cameras before they coded good enough CDAF algorithms which don't need special lenses with less moveable glass to function in a satisfactory manner.
Pentax lenses (esp. screw drive lenses) have a strong enough motor to work well with CDAF, assuming a good algorithm is used. We should not forget that Pentax PDAF uses a multistep approach to focus too.
Moreover, rumors have it that FA lenses would work, i.e., the K-01 would support screw drive AF. Of course, if it wants to profit from the Ltd. lenses.
Originally posted by Chex That would be a great idea, sure the adapter may cost $300 or so..
An almost 1:1 adapter surely costs less than a Tamron 1.4x SDM TC, i.e., less than $100. It has about the same mechanics and no glass.
Originally posted by Clavius Killing that over 0,75 cm is beyond ridiculous.
More like an inch.
Originally posted by eddie1960 it seems the 40mmxs is just such a creature since it's even smaller than a da 40 and rubber covered and not compatible with the slrs (at least according to rumour
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The DA 40 Ltd.'s lens elements are all inside the mount already. Obviously, as 40mm is less than the registration distance and the DA40 uses a rather symmetrical optical formula
http://kmp.bdimitrov.de/lenses/primes/_optics/40f2.8-ii.gif
Whatever the XS in DA40mm XS turns out to mean, I don't think that lens elements are more recessed than with the DA 40 Ltd.
Originally posted by Aku Ankka This is true to a degree - there would be lower speed limits though.
I am not sure. Retrofocus and tele lenses have rather small rear elements. You could be right in theory for a fast symmetrical 31mm though. However, it's lens diameter at f/1.4 is just 22mm, half the mount's diameter. So, I think there is no real limitation here. The big lens elements would all remain outside the mount.
Originally posted by JinDesu I guess at less than a cm, there isn't going to be an aperture ring.
The DA 40 Ltd. has none either.
Originally posted by orangezorki Does anyone else think that the 40mm focal length is a bit odd for a launch/kit lens? On APS it equates to 60mm, a fairly unloved length, especially for primes.
Good catch. For me, it is a sign that Pentax (i.e. Hoya) minimized the investment which goes into this new system.
Originally posted by Anvh Hopefully, it uses an EVF at all, my biggest fear (that it doesn't despite its bulk).
But thanks for the link, it is an interesting info. At twice the surface (i.e., at 14x21mm), it would meet my "competes with OVF" specs (3.3MP, 16EV contrast), except that reaction time would still be too slow.