I've always only used Pentax TCs on Pentax lenses. When I shot Tamron lenses I used their TCS.
Never had noticeable quality issues on any of those setups. -----Original Message----- >From: Paul Stenquist <pnstenqu...@mac.com> >Subject: Re: question about zooms and TCs > >Any image degradation it foes cause isn’t visible to the naked eye. Thus I >would say there is no degradation. Of course we’re talking about a $450 TC on >a $2000 lens. > >Paul > >> On Aug 16, 2018, at 1:21 AM, Subash Jeyan <pdml.l...@gmail.com> wrote: >> >> thanks Paul. it's good to know it doesn't cause too much of an image >> degradation.... >> >>> On Thu, Aug 16, 2018 at 10:41 AM Paul Sorenson <pentax1...@gmail.com> wrote: >>> >>> I use the Pentax DA 1.4 AW TC with the the 55-300 and it's a fine >>> combination. >>> >>> -p >>> >>> >>>> On 8/15/2018 10:02 PM, Subash Jeyan wrote: >>>> i'm going on a winter trek to the himalayas in november. planning to do >>>> some birding also along the way and since the sigma 150-500, at almost >>>> 2kg, is too heavy for that i was looking at alternatives. >>>> >>>> i have a tamron 1.4x pz-af (af works with sdm too) and i was wondering >>>> if i could use that with the da 55-300. i did some googling and the >>>> results surprised me. it looks, in spite of all the conventional wisdom >>>> that TCs can only be used with a sharp prime lens, people have got good >>>> results. see the (old) thread here: >>>> https://www.dpreview.com/forums/thread/3680410 >>>> >>>> have any of you used 55-300, or any other zoom, with a tc? if so i'll be >>>> interested in how that went... >>>> >>>> thanks, subash >>>> >>> >>> -- >>> Paul Sorenson >>> Studio1941 >>> >>> Sooner or later "different" scares people. -- 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.
