Re: Need some help with lens reasembly...
From: Michel Carrère-Gée [EMAIL PROTECTED] Date: 2006/10/05 Thu AM 05:25:26 GMT To: Pentax-Discuss Mail List pdml@pdml.net Subject: Re: Need some help with lens reasembly... mike wilson a écrit : Matt Kelch wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg Welcome to hours of fun! If you search the archives (you might have to go to mailarchive rather than the pdml ones) for A50/1.7, you should find a thread about replacing these very parts. There was a link to a diagram in there, somewhere. Heere: http://pentax-manuals.com/manuals/service/servicemanuals.htm That's the rascal. I was a bit busy yesterday to look for it. The password needs a capital P. If you look at parts 506, 508 and 509, they are the ones you want to refit, along with the detent ball and spring on the opposite side. They will go in place on the main lens body and the aperture ring will slip over them. If only You might as well, at the same time, try to knit a Fair Isle pullover with your toes, cook a Cordon Bleu meal and present a TV programme for all the chance of success you have of assembling at first go. Unless you are the sort of person that everyone hates. Persevere. Sooner or later it will all fall (ha!!) into place. At which point you will dismantle it to make sure. mike - Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
mike wilson wrote: If you look at parts 506, 508 and 509, they are the ones you want to refit, along with the detent ball and spring on the opposite side. They will go in place on the main lens body and the aperture ring will slip over them. If only Would an appropriately sized piston ring compressor from the auto parts store help hold everything in place while you slip it into the barrel? -- Thanks, DougF (KG4LMZ) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
From: Doug Franklin [EMAIL PROTECTED] Date: 2006/10/05 Thu PM 12:20:49 GMT To: Pentax-Discuss Mail List pdml@pdml.net Subject: Re: Need some help with lens reasembly... mike wilson wrote: If you look at parts 506, 508 and 509, they are the ones you want to refit, along with the detent ball and spring on the opposite side. They will go in place on the main lens body and the aperture ring will slip over them. If only Would an appropriately sized piston ring compressor from the auto parts store help hold everything in place while you slip it into the barrel? I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. - Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
On 10/5/06, mike wilson [EMAIL PROTECTED] wrote: From: Doug Franklin [EMAIL PROTECTED] Would an appropriately sized piston ring compressor from the auto parts store help hold everything in place while you slip it into the barrel? I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. It sounds like a strip of brass shimming material tightly wound around the detent when fitting the aperture ring might help. But I've never pulled a lens apart, so I don't know if it's feasible. Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
From: David Savage [EMAIL PROTECTED] Date: 2006/10/05 Thu PM 12:59:48 GMT To: Pentax-Discuss Mail List pdml@pdml.net Subject: Re: Need some help with lens reasembly... On 10/5/06, mike wilson [EMAIL PROTECTED] wrote: From: Doug Franklin [EMAIL PROTECTED] Would an appropriately sized piston ring compressor from the auto parts store help hold everything in place while you slip it into the barrel? I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. It sounds like a strip of brass shimming material tightly wound around the detent when fitting the aperture ring might help. I had a real good think about something like that when I was doing them but came to the conclusion that it probably wouldn't work. It would have to be very thin not to get in the way of things and capable of staying in shape when things were being manipulated around it. Even shim steel would probably not have the properties needed. Plus, it would be sharp enough to introduce its own hazard. But I've never pulled a lens apart, so I don't know if it's feasible. Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net - Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
On 5/10/06, mike wilson, discombobulated, unleashed: I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. Mechanic's tip. Dab a small amount of grease on the ball, attach it to the end of a jeweller's screwdriver and position it precisely as the ring comes down, pulling the driver out as it goes interference fit. -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=|http://www.cottysnaps.com _ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
Cotty wrote: On 5/10/06, mike wilson, discombobulated, unleashed: I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. Mechanic's tip. Dab a small amount of grease on the ball, attach it to the end of a jeweller's screwdriver and position it precisely as the ring comes down, pulling the driver out as it goes interference fit. I found that having to concentrate on that and, at the same time on the other side of the lens, get three equally small and curmudgeonly pieces to go together, whilst trying to slip the aperture ring over all of them left me with the decided feeling that evolution had left me one hand and about four fingers short. Plus an eyeball or two. Not to mention the magnets I needed in my toes to find the ball.. Next time I have one apart, I am going to build a jig. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
Cotty wrote: Next time I have one apart, I am going to build a jig. What about a reel... mike wilson wrote: Cotty wrote: On 5/10/06, mike wilson, discombobulated, unleashed: I suspect something like that will be the official tool to do this job but a normal ring compressor would probably be too thick and get in the way. I found that I could tilt the ring enough to hold the ball in against the spring on one side and then gently slip the other side over the rest of the gubbins. After about the 20th try and well over an hour searching for the fugitive ball bearing. It goes off like a Saturn V if you slip. Mechanic's tip. Dab a small amount of grease on the ball, attach it to the end of a jeweller's screwdriver and position it precisely as the ring comes down, pulling the driver out as it goes interference fit. I found that having to concentrate on that and, at the same time on the other side of the lens, get three equally small and curmudgeonly pieces to go together, whilst trying to slip the aperture ring over all of them left me with the decided feeling that evolution had left me one hand and about four fingers short. Plus an eyeball or two. Not to mention the magnets I needed in my toes to find the ball.. Next time I have one apart, I am going to build a jig. -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
On 5/10/06, mike wilson, discombobulated, unleashed: Next time I have one apart, I am going to build a jig. Or dance one ;-) -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=|http://www.cottysnaps.com _ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
sorry about that, it was a better answer to your post anyway... Cotty wrote: On 5/10/06, P. J. Alling, discombobulated, unleashed: Cotty wrote: Next time I have one apart, I am going to build a jig. What about a reel... Incorrectly attributed Peter, I did not write the above. -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
On 5/10/06, P. J. Alling, discombobulated, unleashed: Cotty wrote: Next time I have one apart, I am going to build a jig. What about a reel... Incorrectly attributed Peter, I did not write the above. -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=|http://www.cottysnaps.com _ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
On 5/10/06, P. J. Alling, discombobulated, unleashed: sorry about that, it was a better answer to your post anyway... That's right, kick a guy when he's down -- Cheers, Cotty ___/\__ || (O) | People, Places, Pastiche ||=|http://www.cottysnaps.com _ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
Matt, See this diagram that I have crudely drawn. http://picasaweb.google.com/rf.sullivan/LensRepair/photo#4982517534313021458 It concerns some of the small parts you highlighted in your 2nd picture. The little curved cap is an electrical contact for the A setting on the lens. When A is set, this little cap sticks up out of the small hole in your mounting flange. You can see it at about 8:30 on the silver flange in your picture. To drive the little cap up, it is spring loaded. To keep it from flying out, it is caged by the L-bracket in my diagram. The groves in the cap go into the slot in the L-bracket. The whole thing rests in a spot on the lens body (8:30 again?) The button at the bottom of the L-bracket rides in a broad grove on the inside of the aperture selection ring. Most of the time you have selected f4 thru f22 and the button holds the bracket, which holds the spring loaded cap down and away from electrical contact with the camera body. When you select A, the aperture selection ring moves over just a bit further to where the grove is wider and the cap is allowed to pop up. To get over to the A selection, you've got to press in the A button and twist the ring. The A mechanism is locked IN or locked OUT by two leaf springs which prevent you from accidentially twisting into A when you wanted f22. You seem to have a good handle on the little ball bearing and spring which you haven't shown. They go in a radial hole in the lens body under the aperture selection ring and make a click as you twist the ring. The last tiny bit you have there is unknown to me, I suspect it is something to make electrical contact within the lens - from the cap or L-bracket to elsewhere. Getting the spring loaded ball bearing, L-bracket with spring loaded cap, and the other bil all aligned and working under the aperture selection ring is a challenge. Regards, Bob S. On 10/4/06, mike wilson [EMAIL PROTECTED] wrote: Matt Kelch wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg Welcome to hours of fun! If you search the archives (you might have to go to mailarchive rather than the pdml ones) for A50/1.7, you should find a thread about replacing these very parts. There was a link to a diagram in there, somewhere. I'm not joking about hours - if it takes you any less than that, I'll be seriously cheesed off. 8-) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Need some help with lens reasembly...
In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
Matt, look for a little ball bearing and a small spring that I don't see. They make the 'click stops' on the lens. Regards, Bob S. On 10/4/06, Matt Kelch [EMAIL PROTECTED] wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
I've found the ball bearing, the spring is in the picture I believe. (Its partially inside of the piston looking thing) I'm just lost at this point how it all goes together. Bob Sullivan wrote: Matt, look for a little ball bearing and a small spring that I don't see. They make the 'click stops' on the lens. Regards, Bob S. On 10/4/06, Matt Kelch [EMAIL PROTECTED] wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
Matt Kelch wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg Welcome to hours of fun! If you search the archives (you might have to go to mailarchive rather than the pdml ones) for A50/1.7, you should find a thread about replacing these very parts. There was a link to a diagram in there, somewhere. I'm not joking about hours - if it takes you any less than that, I'll be seriously cheesed off. 8-) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. This may or may not help. F70-210 http://members.shaw.ca/hargravep/70-210.htm Powell -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
Re: Need some help with lens reasembly...
mike wilson a écrit : Matt Kelch wrote: In trying to disassemble a lens I accidentally dislodged a few parts without getting a good look at how they went together and where they went. I would greatly appreciate any help. BTW, it is a SMC PENTAX-A 70-210mm lens. http://www.vulc4n.com/images/lens1.jpg http://www.vulc4n.com/images/parts.jpg Welcome to hours of fun! If you search the archives (you might have to go to mailarchive rather than the pdml ones) for A50/1.7, you should find a thread about replacing these very parts. There was a link to a diagram in there, somewhere. Heere: http://pentax-manuals.com/manuals/service/servicemanuals.htm -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
