Originally posted by Des if the SDM fails out of warranty it can be readily converted to screw-drive AF which apparently works well.
Originally posted by Des you would probably also want to get the Pentax 1.4x TC at some stage
Here is a post with one of the
pictures I took the day after converting the DA* 300 f4 to screw drive. There is also a MF picture with the 300 on the Q7. Even with Liveview, MF with the DA* 300 can be a challenge.
Please note that unlike the DA* 300 f4, the excellent HD 1.4x AF converter is
not FF.
Here is an example of what to expect if you use the 1.4x on the K-1. For me, the benefit of the 1.4x with the 300 on the K-1 outweighs the FF advantage of the 1.7x, unless you have a very patient subject, or use a MF lens.
While the converted 300 is no longer whisper quiet, it may be the quietest screw drive lens i own. I've not done a scientific test to verify.