A place to politely discuss the tools, technique and culture of photography.
This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.
Yea, sort of. The "telephoto" lens will definitely be degrading the image quality because for one, you're putting a lens on top of the existing lens, too many optical elements. Two, light transmission would probably reduced, given that the aperture would be smaller than f/1.
And btw, nobody can put a binoculars in front of a DSLR to have a usable image, the lenses tend to be wider in diameter than the binoculars.
I've got a homemade adaptor to put a phone onto my spotting scope.
Photo quality is variable. You need to zoom in or you get a circular back border (the inside of the scope)
Any vibration ruins your shot at distance. This even includes heavy walkers, using a timer is a must.
It's an absolute pain to focus.
You lose a lot of light.
Still fun to use.
Yes. Binoculars also reduce the amount of light your eyes see since you're taking a narrow field of view and expanding it to cover your fully vision.
This is also why f/stops work f/stops are the focal length divided by the (apparent) diameter of the aperture. If you add a teleconverter to a lens that magnifies the focal length by 1.4, you reduce the effective aperture by a stop (1.4 is roughly the square root of two)