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How can i use my Canon EF Lenses such as the 17 – 40mm on the Panasonic GH4?, should i buy an adapter?, and if i do wich adapter should i buy?
I'd personally recomend getting the metabones ef to mft speedbooster, you can find it here. http://www.metabones.com/products/details/MB_SPEF-m43-BM1
The advantages to using this adapter come in the glass put inbetween the lens and the sensor, It'll give you an extra stop of light as well as decrease the focal length down to pretty close to what that lens would appear to be on a super35 sensor. The only downside would be the price, it is a bit pricy but in my opinon it is well worth it.
I personally own the Canon FD to mft speed booster and I'd highly recommend anything from metabones