stacking tc question
Posted 04/11/2010 - 11:35
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You may lose that much light they would not focus at all.
Barrie - Too Old To Die Young
https://pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/
https://pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/
Posted 04/11/2010 - 12:54
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they would hunt, but they'd try to focus, right? i just think it would be odd watching multiple systems trying to focus. i have no idea how the camera might manage such a thing.
i actually quite suspect the tc closest to the camera would do the focusing, in the same way that the tc disables lenses from focusing, the near tc would also disable the far tc from focusing.
i don't really fancy trying it, i was just curious.
although i actually have seen some ok results from stacked tcs. it seems to be highly dependent on the tcs and the order in which you stack them.
i actually quite suspect the tc closest to the camera would do the focusing, in the same way that the tc disables lenses from focusing, the near tc would also disable the far tc from focusing.
i don't really fancy trying it, i was just curious.
although i actually have seen some ok results from stacked tcs. it seems to be highly dependent on the tcs and the order in which you stack them.
k7, 15/4, 31/1.8, 70/2.4, 200/2.8, Metz 58
Posted 04/11/2010 - 13:54
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I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Camera:|K-7|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|
Pentax Lenses:|DA12-24/f4 ED AL|DA35Ltd Macro|FA31Ltd|FA77Ltd|FA50/1.4|F70-210|FA20-35 f4/AL|A*200/f4 Macro ED|A50/1.7|A50 Macro f2.8|1.7xAF adapter|
Voigtlander|125/f2.5SL Macro APO Lanthar|
Sigma Lenses:|EX DG 100-300 f4|2X & 1.4X TC|
Flashes:|AF540FGZx2|RingFlash AF160FC|
Posted 04/11/2010 - 14:12
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Dont even try!
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Posted 04/11/2010 - 18:40
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Clarky wrote:
I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Presumably you would have to disable the autofocus on one of them otherwise they would chase each other.
I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Posted 04/11/2010 - 18:43
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Clarky wrote:
I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Clarky - what are you dioing with 2 1.7AF TC's Don't hog the world supply - send me one
I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Posted 04/11/2010 - 18:46
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Oggy wrote:
But the AF is linked through right?Clarky wrote:
I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
Presumably you would have to disable the autofocus on one of them otherwise they would chase each other.I tried stacking 2 x Pentax 1.7AF TC's with my Pentax A 100mm 2.8 and I couldn't get it too autofocus at all. I was just playing around with it and as gillbod says, was just curious.
here it is.
As you can see there is no AF linkage so it can't drive the AF of the lens or the TC that's on it.
Stefan
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
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16 years
what happens when you stack a 1.7x af tc on top of another 1.7x af tc?
do they both try to focus?
i can imagine that would be a bizarre thing.