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Afraid of a Little Dust?.JPG
06-Nov-2013

Afraid of a Little Dust?.JPG

Canon PowerShot S95
10s f/8.0 at 10.7mm iso80 full exif

other sizes: small medium large original
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Tom 30-Nov-2013 00:42
To let you in on a little secret:

This photo might have been staged. The giveaway is the exposure of 10 seconds and the fact that you see the Nikon logo in multiple locations.

The camera was actually zip-tied to my four-jaw chuck and centered reasonably well to within .015", but the lathe was unplugged and put in neutral, and I hand cranked the chuck and smoothly as possible. However, the little jerkiness does show up by exposing the logo clearly in the few places I paused the turning.

The metal coming off of the lens is actually some I had laying around and lightly sandwiched between the cutting tool and the lens. Over the course of turning the chuck, the metal bounced around a little, giving the impression it's coming off of the lens. Nothing was marred, scratched, or damaged in the slightest during the shoot.
Tim Smith 16-Nov-2013 22:38
I'm scared just looking at the photo. Glad it all worked out ok.
Tom 08-Nov-2013 00:10
Agreed, Tony - I will have to buy a Sony A7 and park it next to my four-jaw chuck for use as a universal lens fixture for lathe work.
Tony 07-Nov-2013 19:18
If that first part was a Sony Alpha 7R you could fix the filter rings on any brand of lens as long as you have the right adapter. There's a lot of buzz already in the Leica rangefinder community.
Petr 07-Nov-2013 19:11
O_O
Lensrentals07-Nov-2013 13:43
Rogers note: You must, I repeat must, look at this image in original size.
Lensrentals07-Nov-2013 13:35
Title: Afraid of a Little Dust

Description: Well, I dropped my extra high quality version of the 50 f/1.8D, and I got a nice big dent on the filter ring thread. Peening it out wasn't good enough, I actually needed to chase the thread. Not wanting to spend money on extra equipment to fix this expensive lens, and because I was also afraid of getting dust on the back element of this lens, AND because there aren't any great ways to chuck a perfectly cylindrical object directly on a lathe:
I grabbed my four-jaw, which everyone knows is more accurate than a three-jaw because you can dial it in manually rather than depend on the factory concentricity of the three-jaw. Then I clamped my D800 securely with the 50 f/1.8 on it (no worries here about scratches since it does have that tough magnesium chassis). Finally I set the thread pitch appropriately, drove in the compound slide, and set the RPM to 600, for a speed of about 63 in/sec with the 52mm thread. Well, needless to say, in about four passes, I managed to clean the threads right up.

Now I can happily attach my UV filter to protect this glass from getting any debris or gunk that I would have to clean off directly.
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