Yep...No worries..
I had 6 ZCO,s ..."4" 5-27,s and "2" 8-40,s ...
When myself and a few friends were doing comparisons between all the ZCO,s the 8-40,s were noticeably "Softer" than the 3-27,s at any given power.
All who looked and compared commented on this factor. It is obviously expected at the higher power ranges , BUT from 15-27 the 8-40 was lacking compared to the 5-27.
There are variations , even amongst scopes in the ZCO class.......for instance of the "4" 5-27,s one sample stood out prominently from the others !! it was staggeringly sharp and clear ...noticeably better than the other 3.
Going from this particular sample back to the 8-40,s the 8-40,s were of the impression you just could not dial in the focus correctly.
My original intent was to mount the 8-40 on my Desert Tech HTI 375CT, but i went with the NF ATACR 7-35 IMO its optically as good...even a little better at 30-35 power. .
The 3-27 that stood out, is at this moment the clearest optic i have ever looked through.......it haven't seen through a TT yet , but i have "2" 5-25,s coming and due shortly. One will go on my Desert Tech SRS
The BIG !!!! downer for me in relation to ZCO is NOT the optically quality, But the Mechanical quality....i had 3 of the 6 ZCO fail mechanically which is why i will never touch the brand again. I was VERY fortunate that my dealer here in Aus allowed me to return all the ZCO,s for a full refund as he had other customers with failures as well...so it wasn't just my batch.
I have the S&B 6-36 on order and hopefully it will arrive in the timeframe i have been told.....until then the NF ATACR is the best choice for my HTI.