i had the 1.7x AF TC long back (used with the A*300/4) but as far as i remember there was no way to set the focal length manually in the body. of course i may remember wrong....
On Fri, Aug 17, 2018 at 9:55 AM Alan C <[email protected]> wrote: > That is a very interesting point. I'll try setting the focal length > manually using the 1.7x AF converter to see if there is any improvement. > > Alan C > > On 16-Aug-18 08:28 PM, Mark C wrote: > > If you have both you can test them out. My experience has been that > > unless the teleconverter and lens are designed to be used together, > > results can be unpredictable. Sometimes great, sometimes not. > > > > If you are planning on using the setup with shake reduction enabled, > > check to see of the TC sends adjusted focal length info to the camera, > > or if just passes through the the lens focal length. I think that for > > image stabilization to work optimally the camera should be set to the > > adjusted focal length (lens focal length X teleconverter power), so > > you may nee to manually set it. > > > > Mark > > > > On 8/15/2018 11:02 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 > >> > > > > > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > -- > 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.
