Now here in the UK we are allowed to wander a bit further for our birding I have started using my Imagic 10x50 porro bins again as they are great for scanning the moors but I seem to be having a spot of trouble focussing them. They have always been a bit tight especially in cold weather and a spray of teflon eased that but now they have a sticking point about 3/4 of the way through focusing making focussing very hard. The bins are only about 4 years but have been used quite a lot. Should I take them back to the shop, assuming it still exists or contact Opticron for advice or just replace them ? I chose them in the first place as with the extra light 10x let in they suited me as I suffer from Macular Degeneration and focussing can be a problem in normal conditions.