Roy,don't you often find that when you are using the 400,you suddenly spot a bird quite close by,seems to have appeared out of nowhere,grab the cam,point and focus only to find you are too close,so start to very quietly move backwards,but all to no avail,you have missed the spontaneous shot of a lifetime!!!.Also you can be watching a bird for ages,you are standing directly in front of it,not really sure whether it is going to move ,so should you try for a shot?.No matter how long you have been watching the bird,as soon as you reach for the cam,off it goes.
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