Test about dangerous and radioactive eyepieces and lenses

Is it true there are dangerous and radioactive lenses?

Unidentified flying object with fluctuating halo

You movie many satellites, meteors and apparently inexplicable objects. How is it possible?

Flare Iridium 91

Where i can find the steps of the Iridium satellites? I would like to see a Flare.

Occasion: original telescope MEADE 8 inch made in USA complete, overhauled.

The use that you treat, do you revise it? Check if everything is OK?

Test of pointer for cameras with flash

Do you have a rapid pionter to record cars in the race?

50mm 1.4 Nikon VS Carl - Quality test to moonlight

Convergence of the winds (Mistral and Libeccio) together with the lightnings

Atmospheric phenomenon caused by low pressure.

Falling Moon with identifiy flying object.

Which exposure to use to photograph the moon?

Recipe: Caggionetti

3 steps of the ISS international space station

Beetle Morimus Asper

Voyager odyssey in the space . Images between the major planets and satellites

10 x 50 Jenoptem : Clean of prisms and lenses with a mold.

Is it possible remove the mold from the prisms of my binoculars?

Supermoon VS Clouds december, 2017 : unfortunate evening

Modify Celestron finder from direct to 90°

I have a right telescope finder. Is it possible modify for 90° vision?

Walk in space with GoPro outside the international station

Is a Gopro really reliable?