I want to use another lens for Panasonic GF2 to shoot concerts

45-200, on the GF2, is equivalent to 90-400 with a standard 35mm focal length, which is considered a very long telephoto lens.

The problem is that the aperture of this lens is not very wide, and the high sensitivity of the GF2 is not very good, and most places do not allow the use of flash. I am not optimistic that you can take good photos of the concert.

If you must take a photo, remember not to use automatic mode or automatic metering, but use manual mode and deliberately underexpose (lower the exposure by about 3 stops) to make the photo darker. Select raw for photo quality, which can be post-processed later, which can improve the success rate.

As for GF2, there is not much choice, this is the only telephoto lens. If you use an adapter ring to mount a SLR lens, not to mention the lack of autofocus, the effect may not be good.

In such a situation with relatively stringent conditions, a relatively high-end SLR is required to achieve a satisfactory success rate of film production.