If you align a photo of the same rifle over the crime scene photo. It becomes apparent there is no silencer attached it it.
What happens if you align the 'negative image' (minus a silencer) of the photograph you yourself aligned on top of the 'negative image' I posted up? Would you get the same result, that you have just put forward? or a different result? Likewise, if a duplicate sized 'negative image' (minus a silencer) was overlayed on top of the rifle showing it at the bedroom window (for example, photograph number 23 from the master copy photograph album), would that produce evidence that there was no silencer fitted to the end of the guns barrel? Rather more interestingly, if we could produce an identically sized 'negative image' of photograph 23, and overlay it with a comparable sized 'negative image' of just the rifle, and one of the rifle with a silencer attached (or vice versa), would you be able to tell that there wasn't a silencer attached to the guns barrel at the bedroom window?
Of course, if Essex police released the actual negative strip of photograph number 23 of the master copy album, to say a photographic expert of someone like 'Mr Suthurst' we would not be here having this discussion. Since, examination of the negative of the photograph (23), would tell its own story, and open up a can of worms, because there would be 9 other negatives on the negative strip, which PC Bird (Witham SOCO) did not take, because 'he did not take photograph 23', 'DC Oakey' (Headquarters SOCO) did..