75-300 mm quantaray lens for a Minolta

when-daybreaks · 09-01-2014, 05:03 PM

I was just give a 75-300 mm quantaray lens for a Minolta its also 55m but there is another that is 35-80mm and it says it's 52m would that work then on my Pentax since it is a 52m? -

**jatrax** · 09-01-2014, 05:23 PM - **1 Like**

No. 52 and 55 are the filter ring diameters. At the FRONT of the lens. This number is only useful to tell you what filter size to buy, it has nothing to do with whether a particular lens will fit on your camera.

At the BACK of the lens is what is called the lens mount. Every manufacturer has their own non-compatible mount. In some cases they may have several different mounts. Pentax uses what is called the K-mount and it has very good backwards compatibility.

Your Minolta lens would fit a Minolta camera not a Pentax camera. There are often adapters that can be used to allow a different mount lens to be used on a camera but it is not always practical. The Minolta mount would, I think, require an adapter with optical correction. Not worth the effort IMHO as you can likely buy a comparable k-mount lens for less than the adapter will cost.

Arjay Bee · 09-01-2014, 05:30 PM - **1 Like**

Not sure of intent of question.
The rear mount of a minolta lens will not fit a pentax. I think the distance between the focal point and the sensor is different for minolta as well so lens will always be out of focus even if it fitted unless you are trying to do very close ups.
The numbers you quote are possibly the diameter of the filter threads on the front of the lens.

**boriscleto** · 09-01-2014, 05:44 PM - **1 Like**

This was answered in another thread.

when-daybreaks · 09-02-2014, 06:01 AM

Yep I read it thanks

09-01-2014, 05:03 PM	#1
when-daybreaks Forum Member Join Date: Aug 2014 Location: Ohio Posts: 72	75-300 mm quantaray lens for a Minolta I was just give a 75-300 mm quantaray lens for a Minolta its also 55m but there is another that is 35-80mm and it says it's 52m would that work then on my Pentax since it is a 52m? -

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09-01-2014, 05:23 PM - 1 Like	#2
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	No. 52 and 55 are the filter ring diameters. At the FRONT of the lens. This number is only useful to tell you what filter size to buy, it has nothing to do with whether a particular lens will fit on your camera. At the BACK of the lens is what is called the lens mount. Every manufacturer has their own non-compatible mount. In some cases they may have several different mounts. Pentax uses what is called the K-mount and it has very good backwards compatibility. Your Minolta lens would fit a Minolta camera not a Pentax camera. There are often adapters that can be used to allow a different mount lens to be used on a camera but it is not always practical. The Minolta mount would, I think, require an adapter with optical correction. Not worth the effort IMHO as you can likely buy a comparable k-mount lens for less than the adapter will cost.

09-01-2014, 05:30 PM - 1 Like	#3
Arjay Bee Pentaxian Join Date: Sep 2006 Location: Horn Island, Torres Straits, Q Photos: Gallery Posts: 4,715	Not sure of intent of question. The rear mount of a minolta lens will not fit a pentax. I think the distance between the focal point and the sensor is different for minolta as well so lens will always be out of focus even if it fitted unless you are trying to do very close ups. The numbers you quote are possibly the diameter of the filter threads on the front of the lens.

09-01-2014, 05:44 PM - 1 Like	#4
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,475	This was answered in another thread.

09-02-2014, 06:01 AM	#5
when-daybreaks Forum Member Join Date: Aug 2014 Location: Ohio Posts: 72 Original Poster	Yep I read it thanks