On Dec 19, 2010, at 5:38 PM, Steven Desjardins wrote: > It would also be good to list the size of the image circle of the lens.
Good point. That would be most helpful in judging the ability of a lens to cover another format size. "Just barely" is probably less than desirable. But we're now evaluating lens vx. sensor decisions largely on guesswork and whether one can easily detect vignetting. More information is always a good thing. Paul > > On Sun, Dec 19, 2010 at 5:25 PM, paul stenquist <[email protected]> > wrote: >> >> On Dec 19, 2010, at 5:16 PM, Steven Desjardins wrote: >> >>> We are just seeing the overlap of film stuff and digital sensors. So >>> many lenses were designed for the 35 mm format. We still use "medium >>> format" even though the sensor isn't that size. Look at the 645D. >>> The sensor isn't even close to 6 x4.5, but it was based on that body >>> design. It will take years (if ever) for a more rational terminology >>> to emerge, but as JCO points out we all know what it means. >>> History-laden terminology has a certain charm for many and, it seems, >>> especially photographers. >>> >>> I plan to start calling APS-C "the happy format" and see if it catches on. >>> >> >> There are now so many different sensor sizes, that a description in >> millimeters would be most apt and informative. I expect we'll eventually >> come around to that, after the supply of silly names has been exhausted. >> With film, there was a reason to keep the range of sizes to a manageable >> level, and those sizes were largely dictated by the available supply of >> film. Now, with a wide range of sizes available, dimensional descriptions >> make sense. >> Paul >>> >>> On Sun, Dec 19, 2010 at 4:59 PM, J.C. O'Connell <[email protected]> wrote: >>>> no, the way the term "full frame" is actually >>>> used in todays nomenclature is 24x36 sensor >>>> and lenses. You can mean it to whatever you >>>> want but its not anything but 24x36 at this >>>> point in time technology wise. BTW, I want >>>> Pentax to do a FF dslr, do you know what I >>>> mean? I think you do. >>>> >>>> -- >>>> J.C. O'Connell (mailto:[email protected]) >>>> Join the CD PLAYER & DISC Discussions : >>>> http://tech.groups.yahoo.com/group/cdplayers/ >>>> http://launch.groups.yahoo.com/group/cdsound/ >>>> >>>> >>>> -----Original Message----- >>>> From: [email protected] [mailto:[email protected]] On Behalf Of >>>> Paul >>>> Stenquist >>>> Sent: Sunday, December 19, 2010 4:53 PM >>>> To: Pentax-Discuss Mail List >>>> Subject: Re: New 12-35 lens on the way >>>> >>>> >>>> "Full frame" is a bit of silliness. It's irrelevant. Is a 645 camera >>>> "double >>>> frame?" There are many sensor sizes. All of them are full. Paul On Dec 19, >>>> 2010, at 4:24 PM, J.C. O'Connell wrote: >>>> >>>>> In my opinion, the modern DSLR usage of the term "full frame" means >>>>> cameras and lenses designed for 24x36mm sensors. It doesn't mean all >>>>> the various formats out there are full frame just because the lens >>>>> fits and covers whatever non 24x36mm frame size is being used. Pentax >>>>> DA lenses are not "full frame" lenses in the context of todays gear. >>>>> >>>>> -- >>>>> J.C. O'Connell (mailto:[email protected]) >>>>> Join the CD PLAYER & DISC Discussions : >>>>> http://tech.groups.yahoo.com/group/cdplayers/ >>>>> http://launch.groups.yahoo.com/group/cdsound/ >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: [email protected] [mailto:[email protected]] On Behalf >>>>> Of Boris Liberman >>>>> Sent: Sunday, December 19, 2010 8:00 AM >>>>> To: Pentax-Discuss Mail List >>>>> Subject: Re: New 12-35 lens on the way >>>>> >>>>> >>>>> On 12/19/2010 2:11 PM, paul stenquist wrote: >>>>>> Then why worry about the lens frame? A lens designed for APS-C will >>>>>> outperform one designed for 24 x 36. (They're both full frame. Just >>>>>> different frames.) Paul >>>>> >>>>> I opine (may be wrong, but that's my right) that some 24x36 designed >>>>> lenses outperform some 18x24 ones. In particular, some Sigma EX 24x36 >>>>> lenses show impressive degree of correction of geometric distortions. >>>>> For my kind of shooting it makes them particularly attractive given >>>>> their price tag. >>>>> >>>>> You're however absolutely right that there are no "partial" frame >>>>> lenses >>>>> here. Unless of course, we're speaking of circular fish eyes /grin/. >>>>> >>>>> Boris >>>>> >>>>> -- >>>>> PDML Pentax-Discuss Mail List >>>>> [email protected] >>>>> 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 >>>>> [email protected] >>>>> 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 >>>> [email protected] >>>> 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 >>>> [email protected] >>>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>>> follow the directions. >>>> >>> >>> >>> >>> -- >>> Steve Desjardins >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> 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 >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > > > > -- > Steve Desjardins > > -- > PDML Pentax-Discuss Mail List > [email protected] > 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 [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
