Thanks Bruce for your helpful comments. Do you put front thermal in the same boat, the Thunder for instance?
Cheers
Yes, front add-on thermal has the same limitations as front add-on NV.
The one thing that front add-on thermal has going over it is that rear add-on thermal is not possible while rear add-on NV is well developed and very cost effective making front add-on NV even less attractive
I had a Pulsar Krypton FXG50 thermal front add-on and I still have a HIK thunder TQ50C which can be used as a spotter, scope or front add-on.
I have used it in all 3 modes and as a spotter and scope it is excellent.
As a front add-on I found the image a better than on the Krypton a low magnification (x2-4) but it rapidly pixellated above that and became worse then the Krypton
The mounting system for the Thunder in add-on mode is clumsy and time consuming to set up and unless the scope adaptor is permanently attached to the scope (reducing the amount of light getting into the scope when the add-on is not in use) the add-on will not retain zero
It's worth bearing in mind that, other than front add-ons designed for military use, the add-ons we see in the commercial market only exist to get around laws in certain countries where NV and/or thermal targetting devices are not permitted, but NV/and or thermal observation devices are permitted
Since add-ons use the riflescope reticle for aiming, they can be sold in such countries
For example, if you buy a HIK Thunder TQ50C in Germany, it can be used as a spotter or font add-on. It does not come with a scope mount and there are no reticles - and upgrading the firmware doesn't give it reticles
Cheers
Bruce