Originally posted by George Lama Falconeye - is the 60-250 actually full frame? I heard there is serious vignetting at the lower end of the range when used in FF cameras.
George, you'll find all available info in the
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31629-da-lens-...ts-thread.html.
Until I actually did a serious measurement of this lens, I judge it based on the fact that Pentax patented the lens as a full frame lens and that me and several others cannot see any sign of vignetting when looking through a FF viewfinder (just tried again). I've seen the serious vignetting claim as well (1 Chinese post) and don't believe it. I actually watched the exit pupil getting obscured at a given angle which lies slightly outside the full frame image plane.
The DA*300 is patented as a full frame lens too but not every DA lens is. E.g., the DA 70 is patented as an APS-C lens.
Tell me what you want. But the end of APS-C lenses in 2008 (with the DA15 being the only late comer in early 2009) and the obscured release of five FF lenses over the last two years speaks for itself (*).
Rather, I believe 2008 marks the year where Pentax has changed its roadmap, defining 2011 as the year to release an FF camera and 2010 to finish their MF project. And 2009 to finish their K-7 project which must have started 2006/2007 right after release of the K10D when they still were APS-C convicted.
I don't know if Pentax would announce a 2011 camera as early as PK 2010. But they'll better do. Because Pentaxians will likely migrate in masses if they don't. It would be a shame if Pentax eventually released their FF camera with no Pentaxians left to buy it
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(*) DA*55/200/300 released in 2008 and DFA100 being only mechanically different (released in 2010) tells us that lenses developped in 2nd half of 2008, in 2009 and in 2010 are held back (with the notable exception of the DA15 which I declare a 2008 late comer
). Held back what for? Remember the 1.4x converter disappearance already showcased during PK 2008? Realize that an 1.4x/1.5x converter will make any DA lens fit for FF? So, this is my educated guess based on pure speculation (but I am good at this...):
When FF releases, there will be 4 new lenses: DFA 28-80 standard zoom, DFA*24-70/2.8 and DFA*70-200/2.8 star zooms, and a sub-20 UWA DFA zoom or prime. One lens per year (2008/09/10/11) the FF project took them to deliver.
So, putting 2+2 together, this is MY prediction:
- All in 2011:
- Pentax xxx 135mm digital SLR
- DFA lineup: 28-80, 100Macro, UWA?
- DFA* zooms: 24-70, 70-200, 60-250 (maybe replacing the 70-200 for 2011), UWA?
- DFA* primes: 55, 200, 300, UWA?
- FA Limiteds: 31, 43, 77
- DFA-DA adapter: 1.4x/1.5x converter
I am just not 100% sure that September will be the date where all this is announced yet.
UPDATE:
Actually, the
decision for their FF development project back in 2008 was actually leaked by Shibata, Chi Ho! We may not have taken notice or forgot, but here it is:
Pentax SLR-rich product line general manager Ho Chi Shibata interview
The relevant sentence in a better translation (Franka T.L.):
Originally posted by Pentax Zhongguancun Online Trading (Shanghai) Co., Ltd in June 2008: We noted the trend also, and we are now in the process of starting to plan for the R&D of such line of products. Still, in the near to short term, we will be focusing on APS-C sized product.
(which in short words means: "we have
decided to go FF")
So every move we have seen by the inner circle of Pentax after 2008, June 21 must be analyzed with taking their knowledge of this decision to eventually release an FF product into account.
E.g., this is what Ned Bunnell wrote back in April 2009 when discussing rumors the K-7 may be FF:
Quote: I know that our engineers have studied these issues and would probably not agree totally with my simplistic explanation. However, I think it's important to understand that going to a full frame sensor means not only having to design a brand new camera from ground up, but likely a new line of lenses that meet the more demanding optical requirements
So, from what we know now, this probably exactly is what Pentax did