Quantaray lens-how to connect to my Pentax Kx

jfegan12 · 11-07-2010, 03:08 PM

I was given a quantaray 70-210mm lens from a friend. Is there an adaptor that i can buy to connect this to my Kx? Sorry if this is a dumb question, I'm a newbie at this.

Thanks,

Jeff

Adam · 11-07-2010, 03:12 PM

No, you don't need an adapter, as it's a k-mount lens. Just put it on and follow the instructions for M&K lenses (ignore the screwmount info/adapter):

https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html

jfegan12 · 11-08-2010, 04:57 PM

Adam,

Can't get it to fit. It is a Quantaray 55mm lens, 70-210mm

alohadave · 11-08-2010, 05:19 PM

Originally posted by jfegan12

Adam,

Can't get it to fit. It is a Quantaray 55mm lens, 70-210mm

Can you take a picture of the front of the lens, and the back part and post them here?

Does your friend shoot Pentax?

jfegan12 · 11-08-2010, 05:46 PM

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mel · 11-08-2010, 05:49 PM

Look at that funny notch on the upper right. Is that a K-mount? I've never seen a notch like that. I have an old Quantaray K-mount 135, and a newer (10ish years) Quantaray zoom. No notch like that on either of them.

SOldBear · 11-08-2010, 05:57 PM

Looks like Minolta MC/MD mount, won't fit a Pentax camera.

I don't think there is any adapter. But if there were, the value of the lens would not be worth it.

**boriscleto** · 11-08-2010, 06:02 PM

There is an optically corrected adapter for the Minolta MD mount, but it is not worth it for that lens.

jfegan12 · 11-09-2010, 07:12 AM

Thanks so much for the help. Its great for those of us who are new at this to have a place to get good advice and answers.

Jeff

Entropy · 11-09-2010, 10:30 AM

Originally posted by jfegan12

I was given a quantaray 70-210mm lens from a friend. Is there an adaptor that i can buy to connect this to my Kx? Sorry if this is a dumb question, I'm a newbie at this.

Thanks,

Jeff

Some info on Quantaray - Quantaray is Ritz Camera's store brand. In general, Ritz rebadges products made by other manufacturers under the Quantaray brand. For example, the Quantaray 70-300 available in 2007 was a rebadged Tamron 70-300 lens. In other years it has been a Sigma 70-300. Most Quantaray flash units are rebadged Promaster units. Quantaray tripods appear to be Sunpaks.

When you have a third-party lens (Sigma, Tamron, Tokina, etc) you need to determine which mount the lens is meant for. If it's K-mount, it'll attach without any troubles. If it's not K-mount - You'll need a lens mount adapter, but in many cases a lens can't be adapted to K-mount without either corrective optics or giving up infinity focus. Also you'll likely lose aperture control with any mount adapters.

Some posters above improperly assumed that it was a K-mount Quantaray lens (which is possible - I have a K-mount Quantaray 70-300, the aforementioned rebadged Tamron), in your case it was a false assumption.

Lowell Goudge · 11-09-2010, 11:59 AM

there is an optically corrected Minolta MD to PK adaptor that will let the lens work in stopped down mode (like a takumar) I can't say I have tried the minolra adaptor but I have tried the nikon and canonn ones. They behave like a small teleconverter, the nikon adaptor with a mag ratio of 1.25 and the canon one at 1.45 I suspect the MD adaptor will be somewhere in the middle as a function of it's different regestry distance,

optically these adaptors are very poor at large apertures, with lots of colorbleed but stopped down are reasonable in IQ.

11-07-2010, 03:08 PM	#1
jfegan12 New Member Join Date: Oct 2010 Location: PA Posts: 6	Quantaray lens-how to connect to my Pentax Kx I was given a quantaray 70-210mm lens from a friend. Is there an adaptor that i can buy to connect this to my Kx? Sorry if this is a dumb question, I'm a newbie at this. Thanks, Jeff

11-07-2010, 03:12 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 48,746	No, you don't need an adapter, as it's a k-mount lens. Just put it on and follow the instructions for M&K lenses (ignore the screwmount info/adapter): https://www.pentaxforums.com/forums/pentax-lens-articles/110657-how-use-manua...7-k-x-etc.html Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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11-08-2010, 04:57 PM	#3
jfegan12 New Member Join Date: Oct 2010 Location: PA Posts: 6 Original Poster	Adam, Can't get it to fit. It is a Quantaray 55mm lens, 70-210mm

11-08-2010, 05:19 PM	#4
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by jfegan12 Adam, Can't get it to fit. It is a Quantaray 55mm lens, 70-210mm Can you take a picture of the front of the lens, and the back part and post them here? Does your friend shoot Pentax?

11-08-2010, 05:49 PM	#6
mel Veteran Member Join Date: Feb 2008 Location: Virginia Photos: Gallery \| Albums Posts: 2,531	Look at that funny notch on the upper right. Is that a K-mount? I've never seen a notch like that. I have an old Quantaray K-mount 135, and a newer (10ish years) Quantaray zoom. No notch like that on either of them.

11-08-2010, 05:57 PM	#7
SOldBear Pentaxian Join Date: Feb 2009 Location: Alameda, CA Posts: 3,206	Looks like Minolta MC/MD mount, won't fit a Pentax camera. I don't think there is any adapter. But if there were, the value of the lens would not be worth it.

11-08-2010, 06:02 PM	#8
boriscleto Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 14,460	There is an optically corrected adapter for the Minolta MD mount, but it is not worth it for that lens.

11-09-2010, 07:12 AM	#9
jfegan12 New Member Join Date: Oct 2010 Location: PA Posts: 6 Original Poster	Thanks so much for the help. Its great for those of us who are new at this to have a place to get good advice and answers. Jeff

11-09-2010, 10:30 AM	#10
Entropy Veteran Member Join Date: Jun 2007 Location: Owego, NY Posts: 976	Originally posted by jfegan12 I was given a quantaray 70-210mm lens from a friend. Is there an adaptor that i can buy to connect this to my Kx? Sorry if this is a dumb question, I'm a newbie at this. Thanks, Jeff Some info on Quantaray - Quantaray is Ritz Camera's store brand. In general, Ritz rebadges products made by other manufacturers under the Quantaray brand. For example, the Quantaray 70-300 available in 2007 was a rebadged Tamron 70-300 lens. In other years it has been a Sigma 70-300. Most Quantaray flash units are rebadged Promaster units. Quantaray tripods appear to be Sunpaks. When you have a third-party lens (Sigma, Tamron, Tokina, etc) you need to determine which mount the lens is meant for. If it's K-mount, it'll attach without any troubles. If it's not K-mount - You'll need a lens mount adapter, but in many cases a lens can't be adapted to K-mount without either corrective optics or giving up infinity focus. Also you'll likely lose aperture control with any mount adapters. Some posters above improperly assumed that it was a K-mount Quantaray lens (which is possible - I have a K-mount Quantaray 70-300, the aforementioned rebadged Tamron), in your case it was a false assumption.

11-09-2010, 11:59 AM	#11
Lowell Goudge Pentaxian Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 15,733	there is an optically corrected Minolta MD to PK adaptor that will let the lens work in stopped down mode (like a takumar) I can't say I have tried the minolra adaptor but I have tried the nikon and canonn ones. They behave like a small teleconverter, the nikon adaptor with a mag ratio of 1.25 and the canon one at 1.45 I suspect the MD adaptor will be somewhere in the middle as a function of it's different regestry distance, optically these adaptors are very poor at large apertures, with lots of colorbleed but stopped down are reasonable in IQ.

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