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| 12-15-2013, 03:45 PM | #31 |
| 05-15-2014, 08:45 PM | #32 |
| pentax F*300 4.5 disassembly | |
| 05-28-2014, 08:35 PM | #33 |
 Originally posted by uttam.hathi  my instruction and pictures pentax F*300 4.5 disassembly https://www.flickr.com/photos/34859797@N07/sets/72157644680739402/ ---------- Post added 05-16-2014 at 09:17 AM ---------- srry but i could not create my seperate stream difficult site to navigate, good to view and use marketplace for reference ---------- Post added 05-16-2014 at 09:19 AM ---------- even nowi find it a difficult site to use, not intutive, hope it uses a product designer to revamp the site on useability I have added the link - Seems to be quite thorough. | |
| 06-27-2014, 11:30 PM | #36 |
| Originally posted by jbondo I've put together a complete build-up guide to the Super-Multi-Coated TAKUMAR 1:1.9/85. JB Media | S-M-C Takumar 1.9 85mm Refurbish (When I make the next guide, I'll be sure and start with disassembly. I'm sure more people need to know how to open a lens rather than close it up.) Can someone add this to the master list? Thanks. | |
| 07-17-2014, 06:22 AM | #37 |
| Originally posted by jbondo I've put together a complete build-up guide to the Super-Multi-Coated TAKUMAR 1:1.9/85. JB Media | S-M-C Takumar 1.9 85mm Refurbish (When I make the next guide, I'll be sure and start with disassembly. I'm sure more people need to know how to open a lens rather than close it up.) Can someone add this to the master list? Thanks.  Originally posted by philbrown1 If anyone has any experience of diassembling this group to access both sides of the lenses, I would really appreciate the help and advice Last edited by Chaos_Realm; 07-17-2014 at 06:28 AM. | |
| 07-17-2014, 02:25 PM | #38 |
| Originally posted by philbrown1 I have a Super Takumar 1:4 / 200 with some dust inside the 3rd element group. I think thats the correct terminology. I have followed the information provided in the previous link to: Lens Repair: Asahi Super-Takumar 200/4. But when David gets to this the description of this group he states: Now you can clean both sides of the 1st and 2nd element and the front side of the 3rd element. I have never needed to access the rear part of the 3rd element but I suspect you twist off the black ring around the edge of the 3rd element and then you’ll be able to tap it out like the 1st element. It is the rear part of the 3rd element I need to get to, as thats where the dust is. But I cant tell whether the black retaining collars are threaded, glued, or threaded and glued and didnt want to destroy them with enthusiasm....! The black retaining collars do not seem to want to turn, at either the front or the back. If anyone has any experience of diassembling this group to access both sides of the lenses, I would really appreciate the help and advice. For a bit more background on the problem I am trying to resolve. The dust appears to be more like black paint that has dropped off the matt black grooved walls of this group. But only in one area. I can see the aluminum specks, glistening through the matt black. If I am able to remove the lens from both ends, would it be possible to clean the inner grooved barrel, to make sure I get rid of anymore loose paint and then recoat with some form of Matt Black paint from the car spares shop? I dont want to do all this work and then have some more paint flake off. I've 100% refurbished 5 of this model now, and 2 of those 5 were difficult to disassemble in the same place as yours, so I think we can call this a 'problem area' for the model. The black retainer ring in question is screwed on as well as fixed with lacquer. The threads have a lot of surface area and the factory used a lot of lacquer fixative on some of these which can make ring removal very difficult without using a solvent, as well as possibly using a pair of small strap wrenches. I had good results with acetone. Use only just enough to get the job done. It's better to start small and use more if needed. Acetone will 'wick' into the threads from the side and will usually work within a minute or two. Sometimes repeat application and/or letting it rest are necessary. Acetone will degrade the blacking on the lens element edges so avoid contact there. Acetone will also very rapidly remove the matte black paint from the barrel interior so don't get any there unless that's what you want. If most of the original blacking is sound, one of the easier ways to touch up the interior is with a paint pen or industrial sharpie marker. Whatever paint you use, be sure it will not out-gas volatiles after reassembly (if you can still smell it, it's not cured.) The matte black paint on the interior is somewhat water soluble, so don't soak the part in water for a long time unless you plan on completely re-doing it. Hope this helps! | |
| 07-23-2014, 10:10 PM | #39 |
| Originally posted by jbondo philbrown1, I've 100% refurbished 5 of this model now, and 2 of those 5 were difficult to disassemble in the same place as yours, so I think we can call this a 'problem area' for the model. The black retainer ring in question is screwed on as well as fixed with lacquer. The threads have a lot of surface area and the factory used a lot of lacquer fixative on some of these which can make ring removal very difficult without using a solvent, as well as possibly using a pair of small strap wrenches. I had good results with acetone. Use only just enough to get the job done. It's better to start small and use more if needed. Acetone will 'wick' into the threads from the side and will usually work within a minute or two. Sometimes repeat application and/or letting it rest are necessary. Acetone will degrade the blacking on the lens element edges so avoid contact there. Acetone will also very rapidly remove the matte black paint from the barrel interior so don't get any there unless that's what you want. If most of the original blacking is sound, one of the easier ways to touch up the interior is with a paint pen or industrial sharpie marker. Whatever paint you use, be sure it will not out-gas volatiles after reassembly (if you can still smell it, it's not cured.) The matte black paint on the interior is somewhat water soluble, so don't soak the part in water for a long time unless you plan on completely re-doing it. Hope this helps! | |
| 07-23-2014, 11:51 PM | #40 |
| Originally posted by philbrown1 Jobondo, thanks for all the details. Just what I needed to know. I don't have the time to start the repair at the moment, but I am sure the information you provided, will help me complete the task when I do. Got the acetone already. ;>) Are we talking of the 'vanity ring' at the front. A technique I have been tipped off to, on this forum, for getting the vanity ring off is to use double sided foam tape. Cut small pieces and place on the forward facing surface of the vanity ring. Then take something the right diameter - either a rear lens cap or a front lens cap, are likely to be the right diameter and lightly press to make the tape stick and then rotate. This gets enough grip to break the bonds and is pretty safe from slippage leading to possible scratches. Foam tape is needed for its thickness and also compliance that deals with possible irregularities. | |
| 08-01-2014, 04:59 PM | #44 |
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