instructable MATP 's howto this Sony S2 ( same as normal microusb ) port ( sony called it multi terminal socket). From skyswitches : these models are supported by gphoto too ian morison with LE NR turn off trick: however for A5000 and A5100, when in shutter priority, LE NR (Long Exposure Noise Reduction) cannot be turned off if exposure is more than 1 sec : workaround: .......Well, not entirely true. I agree it is totally inconvenient but there is a way of setting A5000 to BULB mode without Noise reduction. 1. Set the camera to M mode for manual exposure shooting. 2. Set the camera for continuous bracketing at "BRK C 0.3ev". It is a setting available in the bracketing menu. but BULB will not be available then. But you can set exposure as long as 30" 3. Rotate the control wheel for setting exposure time to BULB. 4. Use wired remote for better stability. I purchased NEEWER and it has a mechanism holding the button until released. stargazers...