Most 50mm are based on the Double Gauss design that's been around for about 90 years. Specific elements vary, but the basic design is the same.
http://www.lensrentals.com/blog/2011/08/lens-geneology-part-1 On Wed, Feb 8, 2012 at 9:53 PM, P. J. Alling <[email protected]> wrote: > Pentax, (and every other camera manufacturer that made 35mm cameras), has a > bunch of very well designed and well corrected 50mm lenses sitting on a > shelf somewhere. Virtually anyway. You need a good fastish, lens to add to > your lens line, look no further. In other words Pentax is releasing this > because it's easy, and they can. I don't however expect it to be cheaper, > (OK based on the reputed build of the 35mm f2.4, maybe it can be /cheaper/), > err, less expensive, than a used A 50mm f1.7, though it might depress the > prices for the FA and F versions of the 1.7 to something affordable. > > > On 2/8/2012 12:33 PM, Tim Bray wrote: >> >> I use the 40mm pancake Limited a lot, and at no time have I ever >> thought "gosh, I wish this were just a little longer". >> >> Related: when I go poking around lenses for sale at eBay or >> equivalent, it seems like around 50% are 50mm's of some flavor or >> another. So I'm also a little puzzled at this one. >> >> On the other hand, that 560mm sounds like pure fun. Assuming it costs >> less than a small car. -T >> >> On Wed, Feb 8, 2012 at 9:16 AM, Bipin Gupta<[email protected]> wrote: >>> >>> Hello Walt, that DA 50/1.8 looks good if it is going to be loads >>> cheaper than the good old FA's. But honestly I have tried 50mm lenses >>> on my K20D / K-5 and find it is one of the oddest focal lengths on an >>> APS-C - 75 mm. I can't use it inside my home - Birthdays, Prayer >>> Meets, others - I have to move away from the subject and end up >>> hitting the walls; can't use it on the streets - find I need an 18 to >>> 28 mm for street photography, can't use it for city scapes - like the >>> 10-20 mm for this. So what can I use it for - only portraits? >>> I am truly bamboozled. Please help point me to why I should keep the 50 >>> mm?? >>> >>> -- >>> 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. > > > > -- > Don't lose heart! They might want to cut it out, and they'll want to avoid > a lengthily search. > > > > -- > 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. -- David Parsons Photography http://www.davidparsonsphoto.com Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- 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.
