On Sep 29, 2013, at 8:08 AM, Alexandru-Cristian Sarbu 
<[email protected]> wrote:

>> Regardless of the speed of the AF, all FT SLR lenses have autofocused with 
>> all Olympus mFT cameras from day one of the Pen E-P1. The E-M1 provides a 
>> better AF solution, that's all.
>> 
>> You will never have auto-diaphragm operation with a Pentax DSLR using a 
>> Pentax M42 lens... That's a non-functional lens feature.

> Indeed, but you also won't have open-aperture metering with K and M
> K-mount lenses, and with Nikon entry level bodies can't autofocus with
> all AF lenses. It's not exactly a clear cut line.

The line between "obsolete but very usable" and "dead and buried" is very clear 
cut with FourThirds SLR lenses, unlike the ones you mention above. Because 
these lenses rely upon the mount to power the focusing mechanism as well as do 
aperture control, without a camera that supports the mount features for power 
and aperture control, the lenses are dead and buried. 

Micro-FourThirds camera bodies have been specifically designed to support the 
FourThirds lens protocol so NONE of the SLR lenses are dead and buried. They 
may be obsolete, but they are very usable. 

> Without a good enough AF, u4/3 cameras weren't really an alternative.

I disagree on at least two counts:

- All Olympus mFT cameras have provided AF with FourThirds SLR lenses that has 
been good enough for some purposes.

- Even if some lenses couldn't be used with AF at all (for instance, my 
Panasonic G1 and the Olympus 35 Macro), the lens was still perfectly usable for 
my needs. 

Both of these things say "obsolete but very usable" to me. mFT cameras have 
been a very useful alternative to my FT SLRs since 2008 when they were first 
released. 

>>> It doesn't really matters if they still making lenses or they're NOS, 
>>> that's temporary; the mount is being phased out.
>> 
>> That's true, but does it matter? Isn't it nice that Olympus and Panasonic 
>> have provides a seamless upgrade path so owners can continue using their 
>> existing lenses? And now with native DSLR focusing performance? It's time to 
>> celebrate! ];-)
> It's all good, as long as you WANT to migrate to micro4/3 ;-)

I don't want to migrate to anything, nor do I need to. I want a high quality 
FourThirds format camera that can use my existing lenses. I've been using the 
Olympus E-1 since some time in 2008 for that purpose, I also used the G1, L1, 
and E-5 from 2007 to 2011, and now I'll use the E-M1 for that purpose. The E-M1 
has a better sensor, better viewfinder, image stabilization, better AF, and a 
host of other improvements over the E-1 (and the others). I'm using the same 
lenses, and have a better body to work with now. Haven't migrated to anything, 
I'm still within the same system. Only thing that's changed is that I need an 
adapter, supplied by the camera manufacturer, to mount my lenses on the newer 
body. Big deal. They're even giving it to me for free via a rebate program.

> But we took quite a detour from where we started - which was that the
> youngest, designed for digital SLR mount couldn't survive - yet
> "dinosaurs" like K and F did.

I don't know where you started exactly...

But so far the FourThirds SLR mount is surviving quite nicely, through seamless 
adaptation to its Micro-FourThirds successor. Never mind the many users still 
quite happy with their FourThirds SLR cameras.  

The M-mount, which was the subject of Larry's original design thought, is an 
even older dinosaur than either K or F, and of course it is still thriving 
nicely with only one minor addition (a reader to inform the body about which 
lens is fitted) to enable some new capabilities on the digital bodies. In fact 
the M-mount's predecessor, Leica Threaded Mount, is also still surviving nicely 
as its successor was also designed for seamless adaptation of LTM lenses.

The K and F dinosaurs continue to survive albeit with some significant 
compromises in capability depending on the specific generations of lens and 
body combinations that you are using. 

G
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