Note: DSLR camera is not compact camera, as when you interchange lens, dust can come in, so

• keep you DSLR equipment in a safe, dry, good air flow environment, as in wet environment, Fungus can grow into the equipment, (which is bad)
• when interchange lens, make sure camera open mount is facing down, so no dust drop in,
  • blow away dust when lens is mount up while mount part face up.
  • then mount it.
• camera bag should be clean and soft and safe.
• get a dry box if possible, but as long as you use it every day, shine them under the sun, they will be healthy and fresh

• for the digital dry cabinet, for manual humidity level setting,
  • Green Zone = 55-60% setting
  • Blue Zone = 40-55% setting
  • Red Zone = 35-45% setting

• I have met Fungus with my first lens, it is in the corner, but as I use this lens most time, it didn't grow, and my APS-C doesn't not see this full frame lens corner;
  • the technical term for lens opener is: “Spanner Wrench” (双头工（井）字扳手)
• Home lens clean solution:
  • https://www.diyphotography.net/remove-fungus-lenses-using-soap-water-vinegar/
  • https://www.dpreview.com/forums/thread/3221691
  • https://petapixel.com/how-to-remove-fungus-lens/

• I have met Dust in Camera Sensor, I blow it away almost completely with Giottos Rocket Blower in Clean Toilet, only one tiny dot showing up with small aperture below f8;
  • Then, I bought sensor clean wipe, now everything is cleaned
    • http://www.ebay.com.sg/itm/8pcs-Dry-Wet-Swab-CCD-CMOS-Sensor-Cleaner-Cleaning-Kit-/170756301846?pt=UK_Camera_Cleaning_Equipment_Kits&hash=item27c1de6416

Reference:

• Note: disassembling the lens is worst solution ever, keep it as last solution for the camera service center.
• remove moisture from inside camera lenses
  • http://ask.metafilter.com/15968/How-do-I-remove-moisture-from-inside-camera-lenses
  • http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/39648-moisture-inside-lens.html
• Fungus cleaning for manual lens: http://www.youtube.com/watch?v=-rlDO5Qj6cU&feature=related
  • http://www.paintedstork.com/digiblog/2006/08/dealing-with-fungus-in-lens.html

Fungus (left)

Cheapest Maintain Solution - Silica Gel

• 巨眼之门: http://www.bigeye.url.tw/big5/index.html
• Cleaning FUNGUS from vintage lenses!! Tools and method.: https://www.youtube.com/watch?v=czoisKjBCXY

• here is the video guide: http://www.youtube.com/watch?v=qi6S3jHA21w&NR=1&feature=endscreen
• http://www.youtube.com/watch?v=ChWoZViP0-A&feature=plcp
• http://www.ebay.com.sg/itm/8pcs-Dry-Wet-Swab-CCD-CMOS-Sensor-Cleaner-Cleaning-Kit-/180765844378?pt=Digital_Camera_Accessories&hash=item2a167be39a

• Problem: Camera reset time every time when changing battery
  • Fix 1: try using a different brand memory card (example, a kingston, sandisk, transcend, etc) or try checking if reset problem still existing when there is no card while changing battery
  • Fix 2: if fix 1 failed, try using another battery
  • Fix 3: if fix 2 failed, try re-install firmware
  • Fix 4: leaving a charged battery in camera for a few days to recharge internal clock battery
  • Fix 5: clean the battery's contact area (with alcohol)
  • conclucion if all failed: those capacitors in internal cameras have a limited cycle life, leaving camera without battery for too many times, like those people prefer to keep battery out of camera when not using, may have got this issue.
  • last solution, send to service center to fix it.