Porst 55mm f1.2 focus stock....

Sila · 10-24-2008, 01:38 AM

Got myself a Porst 55mm f1.2 but the focus ring is stock...

How do i dismantle the lens?

Anyone?

Gooshin · 10-24-2008, 03:03 AM

take a screw driver and go at it

Miserere · 10-25-2008, 03:08 PM

I hope you didn't pay a lot for it.

troyz · 10-25-2008, 04:13 PM

Originally posted by Gooshin

take a screw driver and go at it

Use the screwdriver to convince the person that sold you the lens to give you your money back!

ovim · 10-25-2008, 11:14 PM

Go to Manual Focus Lenses :: Index and there under "Equipment Care and Repairs" use search first, and if you don't find anything, ask. I've gotten some great advice there for lens repairs.

edit: I believe the Porst 55mm f1.2 was made by Cosina, so you might also use that with your search. I've got a Cosinon (Cosina) Auto 55mm 1.8 M42 which looks much like a Porst 50mm f1.8 I have.

I've partially dismantled my Cosina f1.8 because its focusing is somewhat sticky. I'don't know if your lens is anything like mine but... First I unscrewed the hood (its threaded) from around the front element. If you can't unscrew it by hand you could try placing the lens (hood down) on something made of rubber, pressing down a bit with your hand an turning counter-clockwise. After removing the hood you can see some very small screws around the front element.

I haven't gone any further because I've been busy with other things, but I'm quessing it should be pretty straightforward after unscrewing those screws.

Sila · 10-26-2008, 03:43 AM

Thanks i will try that......

chse · 10-26-2008, 12:25 PM

You will have to find out how to access the threads, some lenses can be dismantled from the front lens (like the takumar 55mm ...google) some from the 'back': See if there are screws under the rubber and if you can slide the focusing ring in one direction after removing them. If you can do this there might be a limiter screw for the focusing ring. After removing this you can screw the focusing tubus off. Try to make a mark at exactly which position the lens comes apart. The focusing mechanism has an outer and inner thread, mark both (that being said it never worked for me so far and I always have to reassemble by try and error).

You can get the focusing threads going again by applying a small drop of normal 'bicycle' oil and turning them; never ever use WD40 or any other creeping oil it will end up on the lenses and aperture blades; also do not use Q-tips, its fibers will make everything worse. Let the lens sit for a day and see if it is not sticking any more. Or try to get some fine grease, clean the threads with lighter fluid (and water and soap) and apply the new grease.

Have fun and be patient when figuring out how to put it together again (you will have to be).

Last edited by chse; 10-26-2008 at 12:32 PM.

10-24-2008, 01:38 AM	#1
Sila Forum Member Join Date: Apr 2008 Location: Denmark Photos: Gallery Posts: 97	Porst 55mm f1.2 focus stock.... Got myself a Porst 55mm f1.2 but the focus ring is stock... How do i dismantle the lens? Anyone?

10-25-2008, 11:14 PM	#5
ovim Veteran Member Join Date: Sep 2008 Location: Tre, Finland Photos: Gallery Posts: 1,229	Go to Manual Focus Lenses :: Index and there under "Equipment Care and Repairs" use search first, and if you don't find anything, ask. I've gotten some great advice there for lens repairs. edit: I believe the Porst 55mm f1.2 was made by Cosina, so you might also use that with your search. I've got a Cosinon (Cosina) Auto 55mm 1.8 M42 which looks much like a Porst 50mm f1.8 I have. I've partially dismantled my Cosina f1.8 because its focusing is somewhat sticky. I'don't know if your lens is anything like mine but... First I unscrewed the hood (its threaded) from around the front element. If you can't unscrew it by hand you could try placing the lens (hood down) on something made of rubber, pressing down a bit with your hand an turning counter-clockwise. After removing the hood you can see some very small screws around the front element. I haven't gone any further because I've been busy with other things, but I'm quessing it should be pretty straightforward after unscrewing those screws. Last edited by ovim; 10-25-2008 at 11:37 PM.

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10-24-2008, 03:03 AM	#2
Gooshin Veteran Member Join Date: Sep 2007 Location: Toronto, the one in Canada. Posts: 5,610	take a screw driver and go at it

10-25-2008, 03:08 PM	#3
Miserere Veteran Member Join Date: Sep 2007 Location: Boston Photos: Gallery Posts: 1,993	I hope you didn't pay a lot for it.

10-25-2008, 04:13 PM	#4
troyz Veteran Member Join Date: May 2008 Posts: 389	Originally posted by Gooshin take a screw driver and go at it Use the screwdriver to convince the person that sold you the lens to give you your money back!

10-26-2008, 03:43 AM	#6
Sila Forum Member Join Date: Apr 2008 Location: Denmark Photos: Gallery Posts: 97 Original Poster	Thanks i will try that......

10-26-2008, 12:25 PM	#7
chse Senior Member Join Date: May 2007 Location: Philadelphia, PA Posts: 167	You will have to find out how to access the threads, some lenses can be dismantled from the front lens (like the takumar 55mm ...google) some from the 'back': See if there are screws under the rubber and if you can slide the focusing ring in one direction after removing them. If you can do this there might be a limiter screw for the focusing ring. After removing this you can screw the focusing tubus off. Try to make a mark at exactly which position the lens comes apart. The focusing mechanism has an outer and inner thread, mark both (that being said it never worked for me so far and I always have to reassemble by try and error). You can get the focusing threads going again by applying a small drop of normal 'bicycle' oil and turning them; never ever use WD40 or any other creeping oil it will end up on the lenses and aperture blades; also do not use Q-tips, its fibers will make everything worse. Let the lens sit for a day and see if it is not sticking any more. Or try to get some fine grease, clean the threads with lighter fluid (and water and soap) and apply the new grease. Have fun and be patient when figuring out how to put it together again (you will have to be). Last edited by chse; 10-26-2008 at 12:32 PM.