If you wish to purchase a DFA75 all well and good, but please do your research.
The DFA75 and the PS22 front add-ons are not very good, you can end up re-zero your unit in every time you mount it as it suffers from POI shift, the only front add-ons that don't do this cost over £5000 , have a read here on front add-ons http://www.nightvisionforum.co.uk/viewtopic.php?f=3&t=148
also this was said about the DFA75 from an owner
I just don't like to see people waste their money on NV , how many reviews can you find by people who actually own a DFA75 ? not many , now if this unit was that g