Extension tubes/Teleconverters
Posted 25/02/2009 - 07:45
Link
I can't see why not, but what do you consider a cheap AF teleconverter:
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 25/02/2009 - 08:26
Link
Ok, so maybe cheap is slightly optimistic for a AF teleconverter (after looking on Ebay cheapest I could find is about £50 )but the idea is sound?
I am now thinking I have a TC in the UK that I bought ages ago for £10 which is not AF but does have all the "A" contacts.
Could be a cheap macro extension tube.
I am now thinking I have a TC in the UK that I bought ages ago for £10 which is not AF but does have all the "A" contacts.
Could be a cheap macro extension tube.
Posted 25/02/2009 - 12:02
Link
The idea is sound - without the glass all you're doing is moving the lens away from the body, which is all extension tubes (and bellows) do after all.
Joining the Q
Posted 25/02/2009 - 20:57
Link
I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
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 25/02/2009 - 21:04
Link
Clarky wrote:
I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
I have a couple of those made by Vivitar.I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
One has the A contacts and one does not.
Posted 25/02/2009 - 21:32
Link
Mike-P wrote:
One has the A contacts and one does not.
Would this work? From what I have seen, the old extension tubes are very thin, with no protrusion inside to cause any vignetting.Clarky wrote:
I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
I have a couple of those made by Vivitar.I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
One has the A contacts and one does not.
Now look at a converter. Picture it without the glass. Would there be just as much free space over, as with the tubes. Or would the effective diameter still be to small to work with. (No personal experience, but just wondering, and hopefully preventing a possible disappointment.)
Martin.
Posted 26/02/2009 - 09:09
Link
Malo1961 wrote:
Now look at a converter. Picture it without the glass. Would there be just as much free space over, as with the tubes. Or would the effective diameter still be to small to work with. (No personal experience, but just wondering, and hopefully preventing a possible disappointment.)
Martin.
Exactly what I was thinking!
Mike-P wrote:
One has the A contacts and one does not.
Would this work? From what I have seen, the old extension tubes are very thin, with no protrusion inside to cause any vignetting.Clarky wrote:
I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
I have a couple of those made by Vivitar.I think the way to go is, get yourself a Teleplus APK macro extender and remove the glass, No AF of course, but it will allow you to move it back and forth like a bellows and you get metering from the body.
You can pick them up reasonably cheap. I saw one last week go for 30quid.
One has the A contacts and one does not.
Now look at a converter. Picture it without the glass. Would there be just as much free space over, as with the tubes. Or would the effective diameter still be to small to work with. (No personal experience, but just wondering, and hopefully preventing a possible disappointment.)
Martin.
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 -
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13627 posts
18 years
Hythe,
Hampshire UK
It is nigh on impossible to get a AF set of extension tubes and I know with macro you would probably not even have much use for them but if I were to buy a cheap AF teleconverter and cleanly knock out the glass would it work as such?