Hi


,
I currently use Sony SLT-A77V with 16-50mm kit lens, and Sony f4.5-5.6 75-300mm DT.
I generally do wildlife, macro and equestrian photography, but have recently been lured into the world of astrophotography.
I would like to do star trailing, but I need a shutter cable release, and have no idea what to look for!
Can anybody help? Preferably under £20 if possible, with locking function, compatible with a77.
Thanks