I've just bought a secondhand 65mm Sekor off eBay for my mamiya c330s. I though all was well with it until last night, it's very clean and the glass is bright. I noticed the front element of the taking lens has got a bit of give in it though. It's able to rattle back and forth although only by a very minimal distance. Will this have a big impact on the images I'm taking. I'm a bit worried now because I've already left positive feedback.