The bitter truth of the secondary market

Deceived customers from Avito come to my service center every week. The seller seemed like a nice person, The camera sparkled in the sun, but after 3 days a defect appears, the repair of which costs 50% of the cost of the purchase itself. Dishonest sellers are masters at masking problems.

As a service engineer with 15 years of experience, I will make the secret become clear: 5 defects that you will never know about They'll tell you in the description.

5 Hidden problems of used photographic equipment

1. Microadhesion of oil curtains:for cameras with >100k rounds from lubricating the shutter calipers a microdrop of oil is released. At short shutter speeds (1/4000 sec) the curtain sticks, giving a black stripe at the top frame.
2. Masked dead pixel on the matrix:Before selling, some smart people configure the software “mapping” (Pixel Mapping) in the menu, hiding dead pixels. But with a long shutter speed (2 sec) the pixels are hot pop up like bright garlands.
3. Microcrack on the bayonet ring:occurs from falling with a heavy lens. Externally bayonet smooth, but when installing heavy optics, the autofocus contact disappears.
4. Malfunction of the diaphragm closing mechanism (Aperture Solenoid):typical for Pentax and the series Nikon D3000/D5000 - the frames turn out completely black due to the sticking of the leash.
5. Curled or distorted EXIF ​​run:a rare but dangerous case of an attempt to replace the firmware.