prospec lenses

pasojoy · 12-24-2012, 09:07 AM

I have a couple 'prospec' lenses that I'd like to try on my K10, but am hesitant to do it because upon inspection of the lens mount it looks like there is a 'pin' added that isn't on any of my other pentax lenses or other brands of lenses that I have........can anyone tell me if this 'pin' will mess up my camera in any way?? I am adding a picture of it..........

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elliott · 12-24-2012, 09:18 AM

That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck.

If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem.

That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries.

pasojoy · 12-24-2012, 09:30 AM

Originally posted by elliott

That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck.

If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem.

That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries.

Thanks for that!! I don't think I'll try it, but I may try to remove the pin when I'm feeling 'mechanically inclined', LOL. I do have a set of jewelers screwdrivers so it shouldn't be that hard.....(famous last words).......

**interested_observer** · 12-24-2012, 10:48 AM

Originally posted by pasojoy

Thanks for that!! I don't think I'll try it, but I may try to remove the pin when I'm feeling 'mechanically inclined', LOL. I do have a set of jewelers screwdrivers so it shouldn't be that hard.....(famous last words).......

Here is a set of illustrated instructions on its removal. See the recommendation on the screwdriver to use....

theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix

pasojoy · 12-24-2012, 01:38 PM

Originally posted by interested_observer

Here is a set of illustrated instructions on its removal. See the recommendation on the screwdriver to use....

theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix

AWESOME, thanks!!

**Bruce Clark** · 12-24-2012, 02:59 PM

Originally posted by elliott

That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck.

If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem.

That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries.

Good point there about the pin sizes. I have a number of Ricoh lenses from my XR-P film days and have never had any problem with them on the Pentax. I was never sure what all the fuss was about. On inspection all are the larger rounded type. Nothing at all like the one in the photo (just lucky I guess)

12-24-2012, 10:48 AM	#4
interested_observer Loyal Site Supporter Join Date: Jun 2009 Location: Tumbleweed, Arizona Photos: Gallery \| Albums Posts: 5,707	Originally posted by pasojoy Thanks for that!! I don't think I'll try it, but I may try to remove the pin when I'm feeling 'mechanically inclined', LOL. I do have a set of jewelers screwdrivers so it shouldn't be that hard.....(famous last words)....... Here is a set of illustrated instructions on its removal. See the recommendation on the screwdriver to use.... theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix

12-24-2012, 01:38 PM	#5
pasojoy Inactive Account Join Date: Dec 2012 Location: Vermont Photos: Gallery Posts: 55 Original Poster	Originally posted by interested_observer Here is a set of illustrated instructions on its removal. See the recommendation on the screwdriver to use.... theatre of noise: Ricoh Lenses On Pentax Cameras -- The Ricoh Pin Fix AWESOME, thanks!!

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12-24-2012, 09:18 AM	#2
elliott Inactive Account Join Date: Dec 2008 Location: North Carolina Photos: Albums Posts: 1,720	That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck. If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem. That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries.

12-24-2012, 09:30 AM	#3
pasojoy Inactive Account Join Date: Dec 2012 Location: Vermont Photos: Gallery Posts: 55 Original Poster	Originally posted by elliott That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck. If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem. That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries. Thanks for that!! I don't think I'll try it, but I may try to remove the pin when I'm feeling 'mechanically inclined', LOL. I do have a set of jewelers screwdrivers so it shouldn't be that hard.....(famous last words).......

12-24-2012, 02:59 PM	#6
Bruce Clark Loyal Site Supporter Join Date: Mar 2010 Location: Ocean Grove, Victoria Photos: Gallery \| Albums Posts: 4,458	Originally posted by elliott That is the Ricoh pin, it can get stuck in the AF screw drive on auto focus bodies and can make the lens nearly impossible to remove. There are some variations in the pin design though, not all will get stuck. If it is fairly large diameter, rounded and doesn't stick out very far, it will usually be safe, I have an older zoom that has that style and it has never been a problem. That one looks smaller than the safe one I have, so I wouldn't trust it. You can usually remove them fairly easily by disassembling the mount. You could also put a dab of superglue over it and hold it down until it dries. Good point there about the pin sizes. I have a number of Ricoh lenses from my XR-P film days and have never had any problem with them on the Pentax. I was never sure what all the fuss was about. On inspection all are the larger rounded type. Nothing at all like the one in the photo (just lucky I guess)