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jcdog2006 · 11-08-2013, 05:27 PM

Some people said it's impossible to have a Exakta-PK adapter because of the registry-distance issue. But, I just found this one selling on Amazon and advertized to be able to focus to infinity.

How do you think of this? Thanks for your opinion in advance.

tripodquest · 11-08-2013, 05:32 PM

I'm also curious. I checked fleabay, there seems to be a few lenses made by Exakta in Pentax K mount. I wonder if those were originally made in PK mount or later modified? The ones I found are used (older lenses) so hard to tell. An adapter like that would make all Exakta lenses usable on Pentax bodies.

elliott · 11-08-2013, 05:47 PM

Originally posted by tripodquest

I'm also curious. I checked fleabay, there seems to be a few lenses made by Exakta in Pentax K mount. I wonder if those were originally made in PK mount or later modified?

Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany.

That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter.

tripodquest · 11-08-2013, 05:50 PM

Originally posted by elliott

Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany.

That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter.

oh okay, thanks for the information.

**boriscleto** · 11-08-2013, 06:03 PM

RioRico had a non-destructive modification for Exakta lenses.

ANNOUNCING: Easy cheap non-destructive Exakta-Pentax adapter

mannyquinto · 11-09-2013, 02:54 AM

I have one. Yes it goes infinity. I though it did not have any glass when I bought it but it has and it is removable. With the glass remove you can use it as a macro. It does not affect the IQ but I guess just a little. I used it to mount my Topcon 135mm f3.5 which I won on ebay in pursuit of the most 3D lens available on old glass. I was withholding this info since I want to get the Topcon 58mm f1.4 or 1.8 first before posting but ...I changed my mind because I already have the Cosina 55mm f1.2 which is one of my favorite 3D lens.

Here are pictures taken using the adapter. Guess which picture was taken w/ the adapter w/ the glass remove and one with the glass inserted for infinity focus.

**felixkh** · 11-09-2013, 06:49 AM

Top pic with adapter. Bottom pic without adapter.

jcdog2006 · 11-09-2013, 07:26 PM

Originally posted by elliott

Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany.

That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter.

Hi elliott, thanks a lot for your information. I didn't figure out that there is optics inside.

and that's the key point.

Originally posted by boriscleto

RioRico had a non-destructive modification for Exakta lenses.

ANNOUNCING: Easy cheap non-destructive Exakta-Pentax adapter

I read this useful article already, and I know there is Topcor/M42 DIY kit on evilbay. Thanks.

stevebrot · 11-13-2013, 02:18 PM

Originally posted by elliott

Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them.

Exacta did not make lenses, though many lenses were made in Exakta mount.

Steve

11-08-2013, 05:27 PM	#1
jcdog2006 Pentaxian Join Date: Aug 2009 Location: San Francisco Bay Area, CA Posts: 310	Exakta-PK adapter? Some people said it's impossible to have a Exakta-PK adapter because of the registry-distance issue. But, I just found this one selling on Amazon and advertized to be able to focus to infinity. How do you think of this? Thanks for your opinion in advance.

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11-08-2013, 05:32 PM	#2
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249	I'm also curious. I checked fleabay, there seems to be a few lenses made by Exakta in Pentax K mount. I wonder if those were originally made in PK mount or later modified? The ones I found are used (older lenses) so hard to tell. An adapter like that would make all Exakta lenses usable on Pentax bodies.

11-08-2013, 05:47 PM	#3
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	Originally posted by tripodquest I'm also curious. I checked fleabay, there seems to be a few lenses made by Exakta in Pentax K mount. I wonder if those were originally made in PK mount or later modified? Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany. That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter.

11-08-2013, 05:50 PM	#4
tripodquest Inactive Account Join Date: Oct 2013 Posts: 249	Originally posted by elliott Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany. That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter. oh okay, thanks for the information.

11-08-2013, 06:03 PM	#5
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	RioRico had a non-destructive modification for Exakta lenses. ANNOUNCING: Easy cheap non-destructive Exakta-Pentax adapter

11-09-2013, 02:54 AM	#6
mannyquinto Senior Member Join Date: Nov 2009 Location: manila Posts: 152	I have one. Yes it goes infinity. I though it did not have any glass when I bought it but it has and it is removable. With the glass remove you can use it as a macro. It does not affect the IQ but I guess just a little. I used it to mount my Topcon 135mm f3.5 which I won on ebay in pursuit of the most 3D lens available on old glass. I was withholding this info since I want to get the Topcon 58mm f1.4 or 1.8 first before posting but ...I changed my mind because I already have the Cosina 55mm f1.2 which is one of my favorite 3D lens. Here are pictures taken using the adapter. Guess which picture was taken w/ the adapter w/ the glass remove and one with the glass inserted for infinity focus.

11-09-2013, 06:49 AM	#7
felixkh Site Supporter Join Date: Nov 2008 Location: Singapore Photos: Gallery Posts: 1,201	Top pic with adapter. Bottom pic without adapter.

11-09-2013, 07:26 PM	#8
jcdog2006 Pentaxian Join Date: Aug 2009 Location: San Francisco Bay Area, CA Posts: 310 Original Poster	Originally posted by elliott Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. They were not made in Germany. That adapter on Amazon has optics in it to correct for the registration distance, this will degrade image quality and acts like a teleconverter. Hi elliott, thanks a lot for your information. I didn't figure out that there is optics inside. and that's the key point. Originally posted by boriscleto RioRico had a non-destructive modification for Exakta lenses. ANNOUNCING: Easy cheap non-destructive Exakta-Pentax adapter I read this useful article already, and I know there is Topcor/M42 DIY kit on evilbay. Thanks.

11-13-2013, 02:18 PM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by elliott Those aren't really Exakta lenses, they are just lenses from manufacturers like Cosina with the Exakta name on them. Exacta did not make lenses, though many lenses were made in Exakta mount. Steve

Exakta-PK adapter?

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