I have the DAL 55-300 F4-5.8 ED and DAL 18-55 WR lens.
I'm going to airshows and while I'm happy with the 55-300, I could just do with a bit more length, however springing for the bigma or the 120-400 sigma lenses isn't in my budget any time soon.
so, i'm looking at teleconverters which I have found is a bizarre and confusing world that is just insane.
From the sounds of it, I don't want to go too high on the magnification so a 1.4 or 1.5 TC would be about as far to go. 2x would be too much on a 300 lens.
I've found a few threads discussing teleconverters and this thread
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/19694-tamron-t...r-pics-38.html
seems to focus on the tamron 1.4 and kenko 1.5 as the thing to go for.
both have the PZ-AF mounting so Autofocus should work.
I have found a Kenko PZ-AF 1.5 online and photos of it show it with 7 pins to the mounting ring.
the above thread discusses and seems to favour the tamron over the kenko, but there is a huge price difference between the two.
The above thread also doesn't have anything fresh in since 2010. Has anyone got experience of using the Kenko and Tamron TC's on the K30 that could comment, particularly if someone's used it with the 55-300 lens