that quiet an impressive zoom extension on the 55-300!
06-09-2016, 10:44 PM
(This post was last modified: 06-09-2016, 10:52 PM by Klaus.)
Interestingly the 55-300mm is a new design. But yes, that zoom extension is drastic.
Makes me wondering about the centering of the thing - more so because Pentax' record in that respect isn't exactly stellar in my book.
Just a remark 70-300f4-5.6 wouldn't it make much more sense than 55-300f4.5-6.3 ? Knowing all those who will buy this lens already have the kit lens is the 55-70 range that important to sacrifice speed on an already slow lens?
I'm not impressed with the build quality of the 18-50 RE; I don't have one so I can't say anything about its reliability but that retractable mechanism looks terribly flimsy (obvious plastic-on-plastic feel). I hope the 55-300 RE will be better.
Regarding the electromagnetic diaphragm... I wonder, which other lenses would have it? It was included in the 55-300 RE because of the retractable design (very likely), and for smooth aperture control during video.
Nikon introduced their version also with some special lenses - 3 PC-E Nikkors; but they didn't really start with it until last year. Will Pentax do the same, would they wait a bit before large scale adoption? Or that's it, they decided to advance the K-mount in the full-electronic era?
If for now they're just experimenting, then the compatibility issue is at most a niggle. Pentax promised compatibility for K-70, and K-1, K-3 II, K-S2, K-S1 after a firmware update (a notable exception is the K-3... perhaps it's not identical with the K-3 II in the relevant parts).
If the new D FA primes and new APS-C lenses will use electronic aperture control, I imagine quite a few K-3 users would be annoyed.
Anyway... I think it's a good idea (even if I have a presumably incompatible body, a K-5 IIs). Planning is up to them, but I don't think they can afford to wait too much.
The other lenses they released of late - specifically the full-frame quintet - did not seem to be equipped with electromagnetic diaphragm, else the company would've made a big deal out of it. At the same time, the K-1 (like a few other bodies) is reported as compatible with this system so... that doesn't add up.
I can understand why Nikon went for it - because there is no (effective) way of transferring mechanical aperture linkage past the tilt-shift mechanism of a PC-E lens, and leaving these lenses' aperture to be only controllable through a mechanical ring was probably deemed inappropriate for the 21st century. That was probably the reason why there are no tilt-shift lenses for Minolta/Sony and Pentax mounts - except, of course, for the fully "dumb" Samyang. Now Pentax has solved the issue, and I'm wondering if Sony is going to do the same.
What doesn't add up?
All it takes is a bit of planning and thinking ahead, so they'd already start adapting the cameras when they planned the development of the electromagnetic diaphragm lens.