Guest
This very quic and rough test of the Opteka/Samyang 650-1300mm telephoto lens attached to the Sony A7s, tested at full-frame and APS-C modes to both maximum and mimimum focal lenghts of the lens plus a x2 Opteka teleconverter. Whise I was changing lenses and added the teleconverter some particles of dust got into the sensor so sorry for them being on the final footage, I just didnt have the time to take another video.
