Joseph McAllister wrote:
Simple answer, no. The 1,7x AF converter doesn't pass on the focal
length of the lens on it's front end. It has no digital contact, it was
designed for use with A class lenses which don't pass their Focal length
on to the camera only their maximum and minimum apertures. IIRC the
1.7x adapter does pass on the corrected apertures, with an A class prime
lens, but it won't correct for variable focal length lenses weather they
are F FA or DA once again due to the lack of the digital contact on the
the female bayonet of the adapter. You also lose use of all but the
center AF sensor, I wonder how much of this is by design in the current
camera bodies and how much due to the fact that the AF 1.7x was designed
for SF series of cameras which only had a single center sensor.
This may have been touched on before, but I don't remember it, and I'd
like to know.
Do the DSLR cameras know when you are using the AF 1.7x teleconverter?
Or any teleconverter, for that matter? So when you slap a construct on
the camera, do you tell it (for shake reduction info) the focal length
of the lens, or the focal length of the combination?
My A* 300mm ƒ4.0 with the AF 1.7x. 300mm? or 425mm?
Joe
On May 11, 2009, at 10:42 , Tim Øsleby wrote:
Focus wise the F 1,7 does a good job with my DA* 300. It's locks fast,
sometimes faster than the DA* 300 alone. I was refering to image
quality when saying it didn't seem tp like other lenses. But fringing
or abrivation or whatever it is, is unaceptable. steping down at least
two steps, more in high contrast situations is needed
If it doesn’t excite you,
This thing that you see,
Why in the world,
Would it excite me?
—Jay Maisel
Joseph McAllister
pentax...@mac.com
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