With my f/4.0, I have an effective wide-open aperture of 5.6. I just tried it in my quite dark office, got a bit of searching but nothing unusual given the low light level and low contrast. I was actually quite surprised by how responsive it is even in this darkness.
I don’t have a lens slower than f/4.0 near at hand - next time I have time to play a bit I’ll pull out a 5.6 lens and see how that works out. The compatibility chart implies that the 5.6 limit of usability still applies. (The chart can be found as a download under the K-3 Downloads portion of the Ricoh site.) BTW - thanks for the info on the RRS L-bracket for the K-3; my pre-order has been submitted. stan On Mar 15, 2014, at 8:33 PM, Ken Waller <kwal...@peoplepc.com> wrote: > Welcome home Stan. > > Have you noticed any issue with the auto focus at smaller aperatures? I > recall with the 1.7 'auto convertor' there were issues focusing with smaller > aperatures. > > Kenneth Waller > http://www.pentaxphotogallery.com/kennethwaller > > ----- Original Message ----- From: "Stanley Halpin" > <s...@stans-photography.info> > Subject: GESO: HD DA1.4x trial > > > We got back from our Israel trip about 2:00a.m. Thursday, and about every > spare minute since then I’ve been working against deadlines on all three of > my part-time jobs. And thinking about filing taxes before i leave again in > 2.5 weeks. > > I did just take a few minute break. Downloaded and installed the K-3 ver. > 1.03 firmware. Mounted the 1.4x teleconverter on my DA* 300/4.0, mounted the > pair on a K-3, stepped outside and did a few quick snaps of a Downey > Woodpecker on a feeder about 8 feet away. A sampling (3) of the results may > be seen here: > > http://photos.stanhalpin.com/p649772105 > > AF was smooth and precise, no different than with the lens mounted directly > on the camera. > Once I get past these deadlines in a week or so I will try to do a bit more > evaluation, e.g., with other lenses both slower and faster, etc. Meanwhile, > my quick assessment is that if you want/need a 1.4x, I can’t see any reason > not to go with this one. Aside from the price which may or may not come down > a bit. > > stan > > p.s. Israel was a wonderful experience, Boris went above and beyond in > assisting at many steps along the way, and the trip was a great success for > us. In a week or two I hope to be able to get back into the 6000± images and > assemble a small gallery to supplement or substitute for those I’ve already > posted. > -- > > > -- > 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. -- 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.
