All the reviews I've read indicate a slight decrease in performance for the 15/4 over the 14/2.8 at the edge, which is consistent with the design differences. While the 15 is slower, it's also a far less complex (8/6) design than the 14 is (12/11) so it will remain less well corrected. The differences in focal length is very minor and won't have a serious impact on the design complexity.
-Adam On Thu, Apr 15, 2010 at 11:31 PM, J.C. O'Connell <hifis...@gate.net> wrote: > I read a review on the da15 and they said it outperformed > the earlier da14 lens, which wouldn’t surprise me, its > not as wide and slower than the da14. > > -- > J.C. O'Connell (mailto:hifis...@gate.net) > Join the CD PLAYER & DISC Discussions : > http://tech.groups.yahoo.com/group/cdplayers/ > http://launch.groups.yahoo.com/group/cdsound/ > > > -----Original Message----- > From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of Adam > Maas > Sent: Thursday, April 15, 2010 9:12 PM > To: Pentax-Discuss Mail List > Subject: Re: Ultra-wide zooms > > > New design, optimized for size over performance. Quite a good lens, but > inferior in performance to both the DA 14/2.8 and DA 12-24/4. Smaller than a > FA 50/1.4 though. Like the DA 21/3.2 it's marginally inferior to the older > and larger equivalent design. > > -Adam > > On Thu, Apr 15, 2010 at 8:51 PM, J.C. O'Connell <hifis...@gate.net> wrote: >> what about the DA 15mm? >> >> -- >> J.C. O'Connell (mailto:hifis...@gate.net) >> Join the CD PLAYER & DISC Discussions : >> http://tech.groups.yahoo.com/group/cdplayers/ >> http://launch.groups.yahoo.com/group/cdsound/ >> >> >> -----Original Message----- >> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf >> Of P. J. Alling >> Sent: Thursday, April 15, 2010 7:32 PM >> To: Pentax-Discuss Mail List >> Subject: Re: Ultra-wide zooms >> >> >> Unfortunatly it hasn't been done. Most prime designs are at least 10 >> years old. In the case of the DA 40mm limited it looks like it's about >> thirty years old, (see the M 40mm f2.8). >> >> On 4/15/2010 1:35 PM, J.C. O'Connell wrote: >>> How many times do I have to tell you to make the point? >>> A zoom has to do much more than a prime so the zoom cannot be >>> "better" or even equal to a prime with BOTH using state of the art >>> designs and optics, period. Whatever they do to improve zoom >>> performance over the years can also be applied to primes. >> the PDML, please visit the link directly above and follow the >> directions. >> >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > M. Adam Maas > http://www.mawz.ca > Explorations of the City Around Us. > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
