Most of my bird photos are shot with the DA 1.4x. Excellent glass, Paul
> On Jul 16, 2021, at 1:55 PM, P. J. Alling <webstertwenty...@gmail.com> wrote: > > The short answer is no they're not a scam. However, most TCs will magnify > any shortcomings in the system they are added to. Cheap TCs come with their > own sets of optical problems and failings, but a good one, or a matched TC > will give good enough results, for a price. The problem is as time goes on > you often don't get what you pay for. I played around with a number of TCs > inexpensive and in some cases very expensive during and after the film era > and the only ones that really were worth while that I used, were the Pentax > 1.7 AF adapter, not strictly a TC but it works as one on lenses up to the * > 300mm f4.0 twins, with decent results. Though neither of those lenses is the > most optically stellar Pentax telephotos. The Vivitar 2x Macro focusing TC > worked very well with shorter focal lengths say between 40mm and 100mm, > especially on film, on digital it was a little less useful and the images > sometimes left a bit to be desired. The Vivitar 70-150mm with it's matched > multiplier gave results that were very close to the lens alone, unfortunately > that lens was subject to an incredible amount of veiling flair so unless the > photo gods were smiling the results were pretty poor most of the time. > >> On 7/16/2021 5:00 AM, Alan C wrote: >> All teleconverters degrade the image to some extent, 2x more than 1.4x. In >> film & 6Mp days cropping wasn't really an option so they did give more reach >> without the expense of a longer lens. Long ago I had an M42 Vivitar 2x which >> made my SuperTak 55/2 a useful 110/4. Given a high quality TC and a fast >> host lens, good results are possible. However with the high Mp sensors now >> in common use, a cropped image without the TC may be just as good or even >> better so what is the point? Only perhaps cropping options of the TC image >> which starts with full Mp? >> >> Alan C >> -- >> %(real_name)s Pentax-Discuss Mail List >> To unsubscribe send an email to pdml-le...@pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > -- > America wasn't founded so that we could all be better. > America was founded so we could all be anything we damn well please. > - P.J. O'Rourke > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
