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Forum: Pentax SLR Lens Discussion 02-11-2012, 09:25 PM  
What happened to Voigtlander?
Posted By ginsbu
Replies: 38
Views: 4,707
There wasn't any reason for Zeiss to make lenses for Canon until they were ready to provide EF-mount support for auto-aperture, etc. Without that, Canon owners would have gained nothing over using the ZF versions with an adapter, so Zeiss didn't bother. (Apparently, the EF-mount is more difficult to support than F-mount; Samyang have said as much in explaining why they have CPU-enhanced versions of their lenses for Nikon but not yet for Canon.)

Zeiss does still manufacture selected products in Germany, mostly high-end and cine stuff I believe.

Hopefully, the Ricoh takeover will encourage some of the lens manufacturers to make K-mount versions again.
Forum: Pentax SLR Lens Discussion 02-10-2012, 09:35 AM  
Samyang 24mm 1.4 (OFFICIAL SAMPLE PHOTOS)
Posted By ginsbu
Replies: 36
Views: 15,385
It does make you wonder whether their copy was defective...
Forum: Pentax SLR Lens Discussion 02-03-2012, 08:11 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
QFT...
Forum: Pentax SLR Lens Discussion 02-02-2012, 11:38 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
There's also the matter of TC compatibility with AF. I assume Pentax AF is good down to f/8, which would make f/5.6 the slowest AF capable lens with a 1.4x TC.
Forum: Pentax SLR Lens Discussion 02-02-2012, 11:36 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
Indeed. If it's a replacement for the DA12–24, that would make sense.

I was more wondering what it might be if it wasn't intended to replace an existing lens.
Forum: Pentax SLR Lens Discussion 02-02-2012, 11:12 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
A good guess for the Limited zoom, though f/2.8 or f/2.8–3.5 wouldn't have to be all that large if only covering APS-C.

I do wonder about the wide zoom since there's already the DA 12–24.
Forum: Pentax SLR Lens Discussion 02-02-2012, 11:07 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
I'm worried that with the FA50/1.4 not listed, this is going to be a slower (but cheaper) replacement, leaving the DA* 55mm as the much more expensive f/1.4 option. With the wide availability of the FA50/1.4 used, a 50/1.7 (or so) will have to be much cheaper to be successful.
Forum: Pentax SLR Lens Discussion 02-02-2012, 09:24 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
I'd guess it will be compact more in virtue of limited zoom range (only 20–40mm or thereabouts) than slow aperture. Even f/2.8 constant could be quite small (for a zoom) with a limited FL range, though that's optimistic admittedly.
Forum: Pentax SLR Lens Discussion 02-02-2012, 09:15 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
OTOH, the Nikon 16-85mm is decent, the Sony/Zeiss 16-80mm is quite good, and the Olympus ZD 12-60mm is phenomenal. Pentax can make a good lens in the FL range if they want to.
Forum: Pentax SLR Lens Discussion 02-02-2012, 09:12 AM  
NEW Pentax Lens Roadmap 2012/2013
Posted By ginsbu
Replies: 331
Views: 44,851
Interesting! Perhaps the 50mm is just a refresh of the FA50/1.4 then...

As far as I'm concerned, the new roadmap (and the K-01) indicate commitment to the K-mount — that in and of itself is encouraging.
Forum: Pentax News and Rumors 02-02-2012, 08:52 AM  
New Lenses?! - Pentax Re-Hiring Engineers
Posted By ginsbu
Replies: 171
Views: 23,709
Looking at the PDF version of the roadmap, I'm pretty sure not. The DA* looks like a 15 (or 16) – 85mm, as others have suggested; f/4 constant or f/3.5–4.5 probably. I expect this is the much requested WR replacement for the DA 17–70mm, but in DA* trim (though not too expensive, I hope).

The only thing I see in the roadmap that suggests FF is the 50mm denoted as "Standard". Everything else fits just fine with an APS-C–only strategy.
Forum: Pentax SLR Lens Discussion 09-05-2011, 10:00 PM  
Sigma 30mm f/1.4 thoughts and examples
Posted By ginsbu
Replies: 395
Views: 106,768
Photozone corrects for field curvature in their reviews, i.e. they measure corner resolution from images in which the corners are in focus, even if the center is not due to field curvature. Lenstip and slrgear do not, I'm pretty sure. Photozone's reviews are coming in for a lot of criticism here, but field curvature can't be used to explain poor results on their tests.
Forum: Pentax SLR Lens Discussion 09-01-2011, 08:49 PM  
WR Lenses
Posted By ginsbu
Replies: 27
Views: 3,165
Here's hoping for a new kit lens to go with the K-5 replacement!
Forum: Pentax K-5 & K-5 II 06-23-2011, 07:02 AM  
K5 disadvantages/issues/missing features
Posted By ginsbu
Replies: 76
Views: 11,984
It's possible to implement IBIS with modes for panning -- Olympus does.
Forum: Pentax SLR Lens Discussion 06-22-2011, 07:13 PM  
Poll: Wich lenses to put R&D money in?
Posted By ginsbu
Replies: 204
Views: 29,857
I just took the survey but found some of the choices odd and was disappointed not to see some other options. Here's what I'd like to see :
  • WR 17-70mm f/4 or f/2.8–4, or 16-80 or 85mm f/3.5–4.5

  • refreshed 55-200mm WR kit lens with improved optics

  • 23 or 24mm f/2

  • moderately priced 30mm or 35mm f/1.4 or f/1.8

  • 90mm f/1.8 or f/2 (85mm ok too)

  • 135mm f/2.8 or faster

  • inexpensive 50 or 55mm f/1.7 or f/1.8

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