For Sale - Sold: Pentax 1.7x AF tele-converter, Brand New!

xandy · 01-20-2008, 04:33 PM

I imagine then that there is a focusing ring on that teleconverter ?

Edit: and I do not see it in the picture.

Last edited by xandy; 01-20-2008 at 05:51 PM.

m8o · 01-20-2008, 07:06 PM

Originally posted by xandy

I imagine then that there is a focusing ring on that teleconverter ?

Edit: and I do not see it in the picture.

no focus ring on the TC. You manually focus the manual focus lens.

codiac2600 · 01-20-2008, 07:19 PM

Originally posted by m8o

no focus ring on the TC. You manually focus the manual focus lens.

Actually the lens elements within the teleconverter move and you set the manual focus lens to inifinity. It will make a manual focus lens autofocus

dantuyhoa · 01-20-2008, 07:34 PM

The TC comes with KAF mount ( has the "screw " ) on the body side ,KA mount on the lens side . The "screw" is what provides the auto focus function via the AF motor in the body via moving the element-group .

m8o · 01-20-2008, 07:51 PM

Originally posted by codiac2600

Actually the lens elements within the teleconverter move and you set the manual focus lens to inifinity. It will make a manual focus lens autofocus

lol... I guess you didn't realize I own one, had said similar earlier, and was answering a question about whether the TC has a focus ring.

Though Chris, I found it doesn't work that way. Well, maybe it does with some lenses ; I assume then that might be so on lenses that have a 'short throw' on the focus ring. If so, I'll have to start revising what I say when people ask about how it works. It definitely doesn't work that way with my Voigtlander 125mm, with its near 720 degree rotation from min to max focus points.

With that lens, I have to get the focus close, only then can the TC take over.

xandy · 01-20-2008, 09:00 PM

Gents, you have me confused well

OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS"

Now is that: TRUE or FALSE or between

or amI so dumb? ;-)

m8o · 01-20-2008, 09:10 PM

yes [edit: i.e. TRUE] -- dantuyhoa details it ... dunno what's making you think anyone said different but don't worry about it.

Last edited by m8o; 01-21-2008 at 12:16 AM.

marcusyoung · 01-21-2008, 10:28 PM

Originally posted by m8o

yes [edit: i.e. TRUE] -- dantuyhoa details it ... dunno what's making you think anyone said different but don't worry about it.

Does this TC work with M42 takumars, where M42 adapter is used?

Tks,

marcus

codiac2600 · 01-21-2008, 10:49 PM

Originally posted by m8o

lol... I guess you didn't realize I own one, had said similar earlier, and was answering a question about whether the TC has a focus ring.

Though Chris, I found it doesn't work that way. Well, maybe it does with some lenses ; I assume then that might be so on lenses that have a 'short throw' on the focus ring. If so, I'll have to start revising what I say when people ask about how it works. It definitely doesn't work that way with my Voigtlander 125mm, with its near 720 degree rotation from min to max focus points.

With that lens, I have to get the focus close, only then can the TC take over.

You got me there, those macro lenses are much much much... ok impossible to auto-focus with that teleconverter with my said method. My co-woker uses it on his manual 300F4 and it works like a charm! Set it for infinity and bam the AF tele grinds it in the rest of the way.

kyrios · 01-21-2008, 11:42 PM

Originally posted by xandy

Gents, you have me confused well

OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS"

Now is that: TRUE or FALSE or between

or amI so dumb? ;-)

If i remembered correctly, to use it, you must set the focus ring to infinity. If the object is too close or AF is not reached, shorten the focus ring a little bit.
It 's just what i read, never had exp with this 1.7x TC.

kyrios

frank · 01-22-2008, 01:44 AM

Originally posted by marcusyoung

Does this TC work with M42 takumars, where M42 adapter is used?

Tks,

marcus

Yes, it works with M42 lenses too.

frank · 01-22-2008, 01:52 AM

Originally posted by xandy

Gents, you have me confused well

OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS"

Now is that: TRUE or FALSE or between

or amI so dumb? ;-)

Well, the 1.7x TC certainly can't make a manual focus lens to an AUTOFOCUS one

But if you put the 1.7x AF TC between a manual focus lens (w/ max aperture of F4 or faster, sometimes even F5.6 if light condition is good) and your dSLR camera, this combo will be able to do auto focusing within certain range. You can turn the focusing ring on the lens to alter the "certain range", and within that range, this 1.7x TC will do AF for you

marcusyoung · 01-22-2008, 02:24 AM

Originally posted by frank

Yes, it works with M42 lenses too.

Thank you frank.

Indeed the TC is unique and functional.

marcus

afs760bf · 01-22-2008, 08:08 AM

If it works with m42 lenses, does that mean it also works with the 645 and 67 lenses with adaptors?

frank · 01-22-2008, 08:40 AM

Originally posted by afs760bf

If it works with m42 lenses, does that mean it also works with the 645 and 67 lenses with adaptors?

Base on the way this 1.7x TC works, I can't see why it won't work with 645 or 67 lenses w/ adapters. As the image circle of these lenses are bigger than 135mm lenses and DA lenses, I guess it'd be easier for the TC to do the AF job

01-22-2008, 02:24 AM	#28
marcusyoung Veteran Member Join Date: May 2007 Location: singapore Posts: 1,123 Feedback Score: 2 (100%)	teleconverter Originally posted by frank Yes, it works with M42 lenses too. Thank you frank. Indeed the TC is unique and functional. marcus

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01-20-2008, 04:33 PM	#16
xandy Senior Member Join Date: Sep 2007 Location: Regina,Sask.,Canada Posts: 103 Feedback Score: 3 (100%)	I imagine then that there is a focusing ring on that teleconverter ? Edit: and I do not see it in the picture. Last edited by xandy; 01-20-2008 at 05:51 PM.

01-20-2008, 07:06 PM	#17
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Posts: 3,092 Feedback Score: 6 (100%)	Originally posted by xandy I imagine then that there is a focusing ring on that teleconverter ? Edit: and I do not see it in the picture. no focus ring on the TC. You manually focus the manual focus lens.

01-20-2008, 07:19 PM	#18
codiac2600 Veteran Member Join Date: Feb 2007 Location: Rockford, Illinois Posts: 2,027 Feedback Score: 3 (100%)	Originally posted by m8o no focus ring on the TC. You manually focus the manual focus lens. Actually the lens elements within the teleconverter move and you set the manual focus lens to inifinity. It will make a manual focus lens autofocus

01-20-2008, 07:34 PM	#19
dantuyhoa Veteran Member Join Date: May 2007 Location: California Posts: 1,245 Feedback Score: 20 (100%)	The TC comes with KAF mount ( has the "screw " ) on the body side ,KA mount on the lens side . The "screw" is what provides the auto focus function via the AF motor in the body via moving the element-group .

01-20-2008, 07:51 PM	#20
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Posts: 3,092 Feedback Score: 6 (100%)	Originally posted by codiac2600 Actually the lens elements within the teleconverter move and you set the manual focus lens to inifinity. It will make a manual focus lens autofocus lol... I guess you didn't realize I own one, had said similar earlier, and was answering a question about whether the TC has a focus ring. Though Chris, I found it doesn't work that way. Well, maybe it does with some lenses ; I assume then that might be so on lenses that have a 'short throw' on the focus ring. If so, I'll have to start revising what I say when people ask about how it works. It definitely doesn't work that way with my Voigtlander 125mm, with its near 720 degree rotation from min to max focus points. With that lens, I have to get the focus close, only then can the TC take over.

01-20-2008, 09:00 PM	#21
xandy Senior Member Join Date: Sep 2007 Location: Regina,Sask.,Canada Posts: 103 Feedback Score: 3 (100%)	Gents, you have me confused well OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS" Now is that: TRUE or FALSE or between or amI so dumb? ;-)

01-20-2008, 09:10 PM	#22
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Posts: 3,092 Feedback Score: 6 (100%)	yes [edit: i.e. TRUE] -- dantuyhoa details it ... dunno what's making you think anyone said different but don't worry about it. Last edited by m8o; 01-21-2008 at 12:16 AM.

01-21-2008, 10:28 PM	#23
marcusyoung Veteran Member Join Date: May 2007 Location: singapore Posts: 1,123 Feedback Score: 2 (100%)	Originally posted by m8o yes [edit: i.e. TRUE] -- dantuyhoa details it ... dunno what's making you think anyone said different but don't worry about it. Does this TC work with M42 takumars, where M42 adapter is used? Tks, marcus

01-21-2008, 10:49 PM	#24
codiac2600 Veteran Member Join Date: Feb 2007 Location: Rockford, Illinois Posts: 2,027 Feedback Score: 3 (100%)	Originally posted by m8o lol... I guess you didn't realize I own one, had said similar earlier, and was answering a question about whether the TC has a focus ring. Though Chris, I found it doesn't work that way. Well, maybe it does with some lenses ; I assume then that might be so on lenses that have a 'short throw' on the focus ring. If so, I'll have to start revising what I say when people ask about how it works. It definitely doesn't work that way with my Voigtlander 125mm, with its near 720 degree rotation from min to max focus points. With that lens, I have to get the focus close, only then can the TC take over. You got me there, those macro lenses are much much much... ok impossible to auto-focus with that teleconverter with my said method. My co-woker uses it on his manual 300F4 and it works like a charm! Set it for infinity and bam the AF tele grinds it in the rest of the way.

01-21-2008, 11:42 PM	#25
kyrios Senior Member Join Date: Apr 2007 Location: Indonesia Posts: 123 Feedback Score: 1 (100%)	Originally posted by xandy Gents, you have me confused well OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS" Now is that: TRUE or FALSE or between or amI so dumb? ;-) If i remembered correctly, to use it, you must set the focus ring to infinity. If the object is too close or AF is not reached, shorten the focus ring a little bit. It 's just what i read, never had exp with this 1.7x TC. kyrios

01-22-2008, 01:44 AM	#26
frank Veteran Member Join Date: Nov 2006 Location: Singapore Posts: 3,202 Feedback Score: 149 (100%)	Originally posted by marcusyoung Does this TC work with M42 takumars, where M42 adapter is used? Tks, marcus Yes, it works with M42 lenses too.

01-22-2008, 01:52 AM	#27
frank Veteran Member Join Date: Nov 2006 Location: Singapore Posts: 3,202 Feedback Score: 149 (100%)	Originally posted by xandy Gents, you have me confused well OP states: "The Pentax 1.7x auto focus adapter can makes Pentax manual focus lens to AUTOFOCUS" Now is that: TRUE or FALSE or between or amI so dumb? ;-) Well, the 1.7x TC certainly can't make a manual focus lens to an AUTOFOCUS one But if you put the 1.7x AF TC between a manual focus lens (w/ max aperture of F4 or faster, sometimes even F5.6 if light condition is good) and your dSLR camera, this combo will be able to do auto focusing within certain range. You can turn the focusing ring on the lens to alter the "certain range", and within that range, this 1.7x TC will do AF for you

01-22-2008, 08:08 AM	#29
afs760bf Senior Member Join Date: Oct 2007 Location: Oklahoma Posts: 254 Feedback Score: 2 (100%)	If it works with m42 lenses, does that mean it also works with the 645 and 67 lenses with adaptors?

01-22-2008, 08:40 AM	#30
frank Veteran Member Join Date: Nov 2006 Location: Singapore Posts: 3,202 Feedback Score: 149 (100%)	Originally posted by afs760bf If it works with m42 lenses, does that mean it also works with the 645 and 67 lenses with adaptors? Base on the way this 1.7x TC works, I can't see why it won't work with 645 or 67 lenses w/ adapters. As the image circle of these lenses are bigger than 135mm lenses and DA lenses, I guess it'd be easier for the TC to do the AF job