Sigma 17-50mm f/2.8 EX DC OS clean the lens inside

This video is about cleaning the inside of the Sigma 17-50mm f/2.8 EX DC OS lens. The lens had dust behind the front lens element, so in this video the front lens was removed, the lens was cleaned, then the front lens was assembled.

UPDATES: n/a

TIMESTAMPS:
- 00:00 Intro
- 00:38 Tools
- 01:11 Like, sub, donate
- 01:42 Disassembly
- 05:36 Clean
- 09:19 Assembly
- 14:16 Outro

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DONATION:
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TOOLS I USED (ebay /// aliexpress link):
- PH000 screwdriver: http://ebay.us/Dz8nTA /// https://ali.ski/2e8ZaZ
- Plastic spudger: http://ebay.us/JQLobF /// https://ali.ski/7RsFU
- Metal tweezers: http://ebay.us/jGp7JO /// https://ali.ski/g4VpW
- Suction cup: http://ebay.us/LDxIVl /// https://ali.ski/t7M7Q
- Airpump: http://ebay.us/XPC6wo /// https://ali.ski/-Yc1r2
- Lens cleaning fluid: http://ebay.us/WXS3GC /// https://ali.ski/MYvYl
- Microfiber cloth: http://ebay.us/YpEifd /// https://ali.ski/6CzC7
- Flashlight: http://ebay.us/1ouZGD /// https://ali.ski/lr1QH
- Small brush: http://ebay.us/R54Rjh /// https://ali.ski/LEV6Sk
- Permanent marker: http://ebay.us/GFUtke /// https://ali.ski/HOZKG