Pentax lens with modified mount

cooldude14es · 04-13-2009, 09:59 AM

Hello.

I found a good offer on a Pentax lens but the original owner removed the little plastic thing next to the aperture lever so he could use it on Canon DSLR cameras.

I am sure you know which part is missing, right? He assures that this change doesnt affect the functionality of the lens, but what do you think about it? Whats the real function of that plastic little part?

Thanks in advance.

Ben_Edict · 04-13-2009, 02:10 PM

Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally.

Ben

geauxpez · 04-13-2009, 04:05 PM

I would be more concerned about the condition of the rear element -- is that dust or fungus? Inside or outside? How about the rest of the glass?

cooldude14es · 04-13-2009, 10:59 PM

Originally posted by Ben_Edict

Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally.

Ben

Thanks for the info.

Originally posted by geauxpez

I would be more concerned about the condition of the rear element -- is that dust or fungus? Inside or outside? How about the rest of the glass?

Yes, I need to ask him about that, not sure what it is. Anyway, I probably wont buy the lens but the missing part just made me curious and I wanted to ask.

Thanks!

**Just1MoreDave** · 04-14-2009, 09:38 AM

Originally posted by Ben_Edict

Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally.

Ben

I think I have read about Canonites shortening the aperture levers as well. It doesn't look like this lever has been shortened.

The protection is also a light shield. It's a belt-and-suspenders thing, somewhere between good design practice and overkill. Some third-party lenses don't have it. You could make a substitute or borrow from a parts lens.

04-13-2009, 09:59 AM	#1
cooldude14es Senior Member Join Date: Apr 2008 Location: Barcelona, Spain Posts: 264	Pentax lens with modified mount Hello. I found a good offer on a Pentax lens but the original owner removed the little plastic thing next to the aperture lever so he could use it on Canon DSLR cameras. I am sure you know which part is missing, right? He assures that this change doesnt affect the functionality of the lens, but what do you think about it? Whats the real function of that plastic little part? Thanks in advance.

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04-13-2009, 02:10 PM	#2
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally. Ben

04-13-2009, 04:05 PM	#3
geauxpez Veteran Member Join Date: Jul 2008 Location: Atlanta Photos: Gallery Posts: 1,196	I would be more concerned about the condition of the rear element -- is that dust or fungus? Inside or outside? How about the rest of the glass?

04-13-2009, 10:59 PM	#4
cooldude14es Senior Member Join Date: Apr 2008 Location: Barcelona, Spain Posts: 264 Original Poster	Originally posted by Ben_Edict Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally. Ben Thanks for the info. Originally posted by geauxpez I would be more concerned about the condition of the rear element -- is that dust or fungus? Inside or outside? How about the rest of the glass? Yes, I need to ask him about that, not sure what it is. Anyway, I probably wont buy the lens but the missing part just made me curious and I wanted to ask. Thanks!

04-14-2009, 09:38 AM	#5
Just1MoreDave Site Supporter Join Date: Feb 2007 Location: Aurora, CO Photos: Gallery \| Albums Posts: 6,340	Originally posted by Ben_Edict Pentax lenses have a plastic protection below the aperture lever to protect it from getting bent. As far as I know, this protection piece makes it impossible to mount the lens to a Canon, so it has to come off. As long as the aperture level itself is o.k. the lens should function normally. Ben I think I have read about Canonites shortening the aperture levers as well. It doesn't look like this lever has been shortened. The protection is also a light shield. It's a belt-and-suspenders thing, somewhere between good design practice and overkill. Some third-party lenses don't have it. You could make a substitute or borrow from a parts lens.