I think you will find that this is going to depend on everyones vision disposition... I am far sighted with Astigamatism, but I wear contact lenses to correct. With the pin in front of the lense it's terrible for me....Had a viper scope with the pin behind the lens and got total distorsion.
In some instances the pin appears to be double.
So I agree with the Hornet pin in front of lens that way there is no distorsion.