Originally posted by nanhi Thanks for your post Schraubstock Sir. My God! this ancient Pentax TC is simply marvelous. You were justified in applying a bit of de-noising and sharpness as it was amazing you handheld
a 765mm lens at just 1/180 secs. Pretty high ISO too.
Very little distortion and perspective bending too, looking at the brick wall. Amazing shot indeed. Perfect target for lens tests.
Since the SMC Pentax F 1.7x AF Adapter is seen as an "A" type lens by the camera no information about the focal length of the attached lens or the combo is transmitted to the camera.
Regards.
If you want to see another combination, I just posted a series of 4 wildlife photos in the 300+ lens club on page 1480 near the bottom, the last one is cropped the first 4 are uncropped all with little cooking
in photoship. These are all taken within a few seconds of each other. Indeed the first 4 were taken over a period of less than 5 seconds.
The camera was a K-1 and was done at ISO 6400 set hard, which produced an F8 at 1/800. The lens was a Pentax-A (manual focus) 400mm f/2.8 and the TC was Pentax's dedicated long TC, the 2x-L. the one of two
made by pentax that have a protruding element that sticks in the back of the lens. This provided an effective focal length of 800mm. I had calibrated the anti shake for a 1000mm and was using only a monopod
for stablity. I purposely selected the high ISO to cover the sins of shake, motion of the subject, depth of field and a cloudy day. and since I was 1500 miles from home, the fact that there would be no retake.
I manged to get a photo of an eagle landing, preparing to dive for dinner, using his feet to push away the crab's claws, landing the crab on solid ground, and a few minutes later eating the crab.
for most of the rest of the trip I used the weaker 1.4x-L Both of these TC's predate auto focus, but do support the KA mount variant.
P.S. I have a 1.7x adapter as pentax called it that wasa suppose to convert manual focus long glass into auto focus while converting the image as well. If had used it I would never have gotten
this sequence unless I had had the forsite to turn the auto focus off.. I have never had good luck geting it to focus right. but it will take time trying. with 4 pictures in 5 seconds I didn't have time for slow auto focus
Last edited by rvannatta; 06-16-2016 at 11:12 PM.