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Archive 2013 · Repair tips and questions
  
 
carstenw
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p.1 #1 · p.1 #1 · Repair tips and questions


How about a thread with tips about how to make minor repairs and improvements to lenses?

I'll start it off

How can I straighten (= make round) a filter mount with a slight flat spot?



Feb 03, 2013 at 08:45 PM
flashinm
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p.1 #2 · p.1 #2 · Repair tips and questions


Micro tools sells a tool for that. I have one, but the results are hit or miss. It works better for small dents that are relatively uniform.

http://www.micro-tools.com/store/P-LV1/Lens-Filter-Ring-Vise.aspx



Feb 03, 2013 at 10:26 PM
carstenw
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p.1 #3 · p.1 #3 · Repair tips and questions


Thanks for the tip! I read some posts on other forums about this type of tool, and it seems that many don't get it to work, but some do. One guy said that he gradually increases the diameter, and just turns it with a touch of force repeatedly, and has used it successfully a few times. I couldn't find the one you linked to locally at Micro Tools Germany, and it seems to be backordered in the States, so I ended up buying this one:

http://www.ebay.com/itm/Small-Lens-Vise-Tool-Repair-Filter-Ring-Professional-30mm-to-105mm-Steel-NEW-/150979618659



Feb 03, 2013 at 11:26 PM
carstenw
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p.1 #4 · p.1 #4 · Repair tips and questions


Anyone reading other threads (the recent purchase thread, as well as one other thread I couldn't find right now) about lens repairs here may have seen that I was recently able to partly disassemble and clean both a Mamiya RZ67 127mm lens, as well as a Hasselblad X-Pan 90mm lens.

In fact I had a third lens with "fog" or "haze" inside it which I had just put on a shelf for later consideration a few years ago, and then forgotten. The lens is a Schneider-Kreuznach 135mm f/3.8 Xenar, for the 4x5" format. It is apparently a beautifully rendering lens with a very classic look, and when I bought it (from eBay Canada) I was thrilled and very keen to try it, but when it arrived I ended up not even trying it. It even sat a year at a guy's workplace who thought he could fix it but never got around to it.

Tonight I suddenly realised that my recent work on the other two lenses may also be applicable with this lens, and pulled it down again. Back then I could see no way to open the front half (since the haze was between the two elements in the front half of this standard two-piece large format lens construction (the shutter sits in the middle, and can be exchanged or removed, depending on how you want to use it). Looking now with newfound knowledge, I immediately spotted the tell-tale notched ring which is the first step in opening up many lenses.

Removing the notched ring allowed me to use my lens sucker to pluck out the front element, and the haze turned out to be on the front face of the rear element, easily cleaned. To be sure, I cleaned all surfaces very carefully and put it back together. I think it may now be the most pristine lens I own, with no dust inside and beautiful surfaces all around, and I will try it out sometime in the spring, I hope.

Here are some cheesy iPhone photos documenting the process and the tools used. In the first photo, the two notches can be seen just above the 'z' in Kreuznach and opposite that.

http://throughthelensdarkly.com/forums/Other/CW_20130203_iPhone4S_0002.jpg

http://throughthelensdarkly.com/forums/Other/CW_20130203_iPhone4S_0003.jpg

http://throughthelensdarkly.com/forums/Other/CW_20130203_iPhone4S_0004.jpg

http://throughthelensdarkly.com/forums/Other/CW_20130204_iPhone4S_0005.jpg



Feb 04, 2013 at 12:03 AM
XsigmaSD
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p.1 #5 · p.1 #5 · Repair tips and questions


carstenw wrote:
..., and I will try it out sometime in the spring, I hope.

You have MUCH more patience than myself. After all that, I would have to find something to shoot today!



Feb 04, 2013 at 12:24 AM
 

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contas
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p.1 #6 · p.1 #6 · Repair tips and questions


Those works, I let the repairman do at a price of a breakfast here.I do care only about conversion between formats and systems that repair-shop never take.That's is a common in my country.


Feb 04, 2013 at 02:23 AM
crazeazn
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p.1 #7 · p.1 #7 · Repair tips and questions


use the best screwdrivers u can get your hands on otherwise you will strip the screw and be screaming....then u end up going to a jeweler.


Feb 04, 2013 at 02:36 AM
carstenw
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p.1 #8 · p.1 #8 · Repair tips and questions


What screw? There were no screws in this process. I use Wiha screwdrivers, btw.


Feb 04, 2013 at 06:53 AM
carstenw
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p.1 #9 · p.1 #9 · Repair tips and questions


XsigmaSD wrote:
You have MUCH more patience than myself. After all that, I would have to find something to shoot today!


Well, it is large format, so a tripod is de rigeur, and the whole process is time-consuming, plus film development and scanning. Right now it is below zero here, and everything is wet and dreary. I did go out, but with my Olympus E-PL3



Feb 04, 2013 at 06:55 AM





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