Yes it is, but I has the same effect outside.. That said the internal apature lever, doesn't quite get too that level off keeping light out.. The zero-focus-effect is a nice bonus.. You should try it

@@tommyskauwe’re did u get the cap from please

@@philipheelham3061 It is homemade from an old Binocular-cap I had lying around, therefore it is a diy. I don't like drilling in the original cap from hikmicro.

I’m sure I’ve an old scope cap or binoculars cap I’ll give it a go if not I’ll order a cap thanks for your help

I prefer to take off the lens cap when I shoot. How hard was it to remove the original. I tried pulling mine gently but didn’t want to force it.