Bought the same lens shortly after my camera in January 2012. Got a bit of use out of it when I started doing photography more seriously in October and November the same year, but I replaced it with a Tamron 70-300mm lens the following month. I really like the low weight and the way the EF-S 55-250mm handles, though. The only reason I felt the need to replace it so soon was its tendency to produce large amounts of radial blur in most images. Changing the aperture setting didn't help, either, so I haven't used it much since then.
This may be a unique problem with my lens, though, since I haven't heard anything like this about it elsewhere. Besides, it's a fantastic piece of equipment for its price!
I hope you enjoy using it and will look forward to see future shots taken with it!
Interesting, I originally got it to do more animal shots when I visit the zoo. I havent been able to visit my zoo yet so im not sure how thats going to go. I thought my next lens should be something i can zoom with since my 50mm cant do much overall. But then I found a new found love for macro photography... and any macro lens is way over my budget. So I bought some macro attach on lenses for about 10 dollars haha, so far they work okay but I wish I could focus on a larger space... not sure how to accomplish that.
This may sound stupid and obvious, but have you tried lowering the ISO and increasing f-stop and exposure time? As far as I understand macro attachments (is it a reverse adapter?) usually lead to having a *very* small focal plane. Increasing the F-Stop as well as the exposure time can possibly make up for this (f-stop is obvious, but long exposure times increase the depth of the focal plane as well!).
Out of interest, what's the closest possible focusing distance using the macro attachment? Without it its something around 5 feet, isn't it?
I assume that's with the focus of your lens manually set to the minimum distance? Changing the focus of the lens should still have an effect though, even with the attachment on
Other than that, you can try using higher F-stops and long exposure like I mentioned, so you get a larger focal plane at least - though I am not sure about the progression from the focal plane to out of focus areas, it's possible those things you want blurred will appear a little too defined. Trial and error, I guess