| Moderated by: chrisbet, | Page:   1 2 3   |
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| Replacement lens focus ring grips - Page 2 | |
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| Posted: Tue Feb 18th, 2020 15:06 |
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11th Post |
GeoffR
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Chris, get it serviced by ACS, as Eric mentions above, they have serviced several lenses and cameras for me, ring and ask for David he will give good advice. I agree, if the focus action isn't smooth changing the rubber grip isn't the solution
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| Posted: Tue Feb 18th, 2020 16:39 |
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12th Post |
chrisbet
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A little confusion here - the ring needs replacing as it is split - I have effected a temporary repair but would like to replace it. The focusing is very smooth, it just takes more effort than a brush with the little finger! I have partly disassembled the lens (without disturbing the optics) and it is not the friction brake causing the resistance. This is the only manual focus lens I have got and it certainly isn't as free as the AF lenses, so I was just asking whether this is normal behaviour for my lens - especially as it has two sets of helicoids.
____________________ If it is broken it was probably me .... |
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| Posted: Tue Feb 18th, 2020 23:17 |
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13th Post |
Robert
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chrisbet wrote:A little confusion here - This is the only manual focus lens I have got and it certainly isn't as free as the AF lenses, so I was just asking whether this is normal behaviour for my lens - especially as it has two sets of helicoids. I just checked, the word you used was "heavy", no MF lens should feel heavy to focus. On the other hand, most of the AF lenses I have, feel overly slack to focus manually, quite horrible by comparison with the old MF lenses. Heavy or stiff are not words which I feel should be associated with the focus action of good MF Nikkor lenses. The grease may have stiffened, it may have been serviced in the past with the wrong grade of grease or it's suffering from lack of use. A good lens technician will know instantly if it's right or not. I will try an experiment later to see if I can measure the torque required to turn the focus rings of my MF lenses with the simple expedient of wrapping a little thread around the focus ring and tugging with a spring balance. Richard Haw is a well known lens expert who is keen to share his knowledge on manual lenses. https://richardhaw.com He is rather entertaining and very knowledgeable, it's well worth trawling his site, I would be surprised if he hasn't covered your lens or one very similar. He covers greases and solvents (among many other things like making lens spanners etc.) in great detail in separate sections of his site.
____________________ Robert. |
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| Posted: Wed Feb 19th, 2020 02:51 |
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14th Post |
chrisbet
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Thanks Robert, I had already found Richard Haws site some time ago when I repaired one of my "plastic" DX lenses - even made a new bush from brass to replace a broken plastic bush  and yes he does cover the 105 micro lens in detail.Fortunately I have a set of instrument screwdrivers and last night I stripped the 105 down to the rear set of helicoids and they are totally devoid of grease, just a black stickyness in the threads..... so I have ordered a small pot of 10 weight helicoid grease. After cleaning, the rear helicoids are moving very freely, I expect to find the front helicoids in the same state, but I will leave them for now until I have the grease to reassemble the rear ones - I don't like leaving things with too many pieces apart! The lens has clearly been apart in the past, none of the rings are sealed with lacquer and the front ring grub screw is missing. I will reassemble with a little weak bond Loctite when I am finished.
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 19th, 2020 04:06 |
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15th Post |
Robert
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Brilliant! We got there. I am sure it will be a joy to use when you have finished. 
____________________ Robert. |
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| Posted: Wed Feb 19th, 2020 06:12 |
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16th Post |
chrisbet
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Well the extension tubes turned up this morning so as a test I found a watch screw that is about 1 mm long .... taken at 1:0.88, f2.8 and cropped - DOF is about 1/2mm ! 
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 19th, 2020 07:15 |
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17th Post |
jk
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Grub screws can be found at an old fashioned jeweller. Is there a similar screw elsewhere that you could post a picture of. I might have one or some one else might be able to provide.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Wed Feb 19th, 2020 07:45 |
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18th Post |
jk
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chrisbet wrote:Well the extension tubes turned up this morning so as a test I found a watch screw that is about 1 mm long .... See the shallow DOF.
____________________ Still learning after all these years! https://nikondslr.uk/gallery_view.php?user=2&folderid=none |
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| Posted: Wed Feb 19th, 2020 10:51 |
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19th Post |
chrisbet
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Its the same thread as the screws that hold the meter coupling bracket and about the same length, but a grub screw not a pan head.
____________________ If it is broken it was probably me .... |
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| Posted: Wed Feb 19th, 2020 14:30 |
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20th Post |
Robert
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At about 1:1 a ball point pen tip is a bit small but try a clean shiny new small ball bearing, if you get it right you may have a selfie...
____________________ Robert. |
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| This is topic ID = 1794 Current time is 13:03 | Page: 1 2 3 | |
| Nikon DSLR Forums > Camera and Lens Forums > Lenses > Replacement lens focus ring grips | Top | |
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