Start fire with the fresnel lens

What`s the best lens to start fire?

Spotting Scope Leica Televid O 41mm adapter

I have a Leica spotting scope, it has a graft with Ø 41mm. Is possible have an adapter for my Nikon camera?

GoPro Hero tripod camera adpter

I want to use my GoPro Hero with a tripod, without unscrewing the screw and remove the dropout and quick release. Do you have something?

Additional wide-angle camera with special connection for camera without thread

I can`t find an additional wide-angle for my camera. Say it is not connection. You can do something?

Super zoom additional camera to utilize photografic lens

I have a reflex lens. Can i mount it on my camera with 37mm thread?

UP CLOSE NF Celestron Binocular 7x50 / 7x35 / 8x40

Tripod with photographic head

Do you have a metal stand? I had bought a plastic but not worth anything.

Giant binoculars collimation diameter 100 mm 45 ° with interchangeable eyepieces

Could you collimate a 100mm binoculars?

Crows VS Airone test shooting backlight with GOPRO modified 70X

I would like to modify my GOPRO to be able to apply to a telescope. Is it okay? How does he behave? His results?