Funny that this has come up again. I use a MTC Viper 10x44 on my HFT set up and find that I too have problems with 8 - 13 yards and 38 - 45, both going more blurry towards the extremes at each end. I recently bought a MTC Mamba light 3-12x44 and have beeen very surprised to see (pun intended) an improvement with the clarity, this being dispite extra lenses in the scope due to zoom! As such I would recommend that you consider looking at a non-fixed scope to try and get better optical arrangement of a zoom. I was amazed at the transformation and can now view the target and hits better beyond 40 yards and now down towards 10 yards. hope this helps, but has confused the --- out of me.