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23.12.2006 - 15:13
from kusi

repair a stuck nikkor 18-70mm lens

the 18-70mm nikkor zoom is a very common lens todays because it is offered in kits with various nikon dslrs since the d70.
though surely a good lens, regaring its moderate price, the usefull focal-range and the pretty good sharpnes (at least on most examples), it has one huge flaw: its build quality!
beside the bajonett, there’s not much metal on this lens. especially the tubus, coming out when zooming is a very loose construction…

this given, i wasn’t so much surprised, when my example of this lens, which has now 2.5 years, some time ago started to stuck from time to time when zooming. but it startet to get worse and last week i was left with 24-50mm range only.
searching on the net, i found, that this seems to be a very common problem with the lens, as can be read e.g. on www.nikonians.org.

even though i already disassembled/repaired several cameras, shutters, lenses, these were all much older examples with few or no electronic at all. so i was a bit unsure to attack this ‘modern beast’ with my screwdriver.
but as my garantie is was over and it wasn’t of my favorite lenses anyway, having it repaired wasn’t an option for me, and so i told myself ‘what the heck, go for it…’ :-D

as i had no idea where to locate the source of my problem and the only screws i found were at the bajonett, i started to take apart from this side. no problem for this, just had to go carefuly, not to break the little cables for the A/M-switch and the flatcable where the contacts are connected to the lensbody.

nikkor_1870_1.jpg

so far so good. but:
this was the wrong side to solve the problem! the only things that can be seen, are the electronics, the focus-ring mechanics and the rear-element moving in the middle of all this.
(so if you have the same problem, just leave the bajonett-side as untouched… ;-) )

so i had to find a way to open the lens on the front-tubus. to do this, uplift the rubber-band of the zoomring with a small screwdriver or somethin alike and remove it completely.
under this, you find one single bolt-screw, which is to unthighten.
the zoom and the middle ring of the tubus then can both move pretty free. if you pull/push on the front-element, you can ‘zoom manually’ now, but this was still going as uneasy as before.
to find the source of the problem, i had to try around, until i was able to pull the front element fully out, in the position where you have the 70mm normally. then you can see 3 screws around the zoom-tubus, which fix the front element. and one of these screws was loose about 2-3mm!

nikkor_1870_2.jpg

i thightend the screw and miracle: i was able to move the front-element easily completly in and out again…
problem solved! :-)

ok, one thing then is left: to put the two tubus together again , so that you can put the screw holding it together in again… i had to frikle about 15min to fit it together as it was before and it is almost not possible to explain in words how you have to do it… but don’t desperate, take a deep breath and try again… it is feasible! :-)

ps: it works perfectly again, everything, zoom, af, sharpness… so i have saved some hundred bucks for this repair. i’ll lay them aside: for a 17-35mm/2.8… one day… ;-)

09.12.2006 - 21:26
from kusi

jetzt geht’s los

*sing*

die bretter sind präpariert, schnee hats anscheinend auch gegeben…
das sind gute neuigkeiten! :)

snowboard.jpg

08.12.2006 - 18:50
from kusi

korn, viel korn…

gibts bei asa 3200! :)

letztes wochenende hab ich im ganzen 10 filme verballert, hier ein paar erste resultate.
mehr folgt dann wahrscheinlich später…

(teile des) oslo gospel choir live im kursaal bern
Oslo Gospel Choir
Oslo Gospel Choir
Oslo Gospel Choir