I have just given mine a proper measured test. I have a 14mm hole in my front iris and I can focus down to 2 metres from the front lens. Perfectly adequate for rats.
I have just given mine a proper measured test. I have a 14mm hole in my front iris and I can focus down to 2 metres from the front lens. Perfectly adequate for rats.
She was only an Admiral's daughter but her naval base was full of discharged seamen.
I made it out of aluminium but if you use a plastic lens cap with a hole in you get the same effect. You can try with a piece of card if you like. I just did it in daylight so no problem.
She was only an Admiral's daughter but her naval base was full of discharged seamen.