It looks like Best Buy has a great selection of Canon SLR compatible long range lens. They range from 18mm to 500mm with a price range of $400 to over $6,000.
Canon 17-55mm f/2.8
A zoom lens with a big range, from slightly wide-angle to long telephoto. The 20 measures the range, some lenses are not so strong, say 10x.
A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such as binoculars and long or telephoto camera lenses.There are two basic types of telescopes, refractors and reflectors. The part of the telescope that gathers the light, called the objective, determines the type of telescope. A refractor telescope uses a glass lens as its objective. The glass lens is at the front of the telescope and light is bent (refracted) as it passes through the lens. A reflectortelescope uses a mirror as its objective. The mirror is close to the rear of the telescope and light is bounced off (reflected) as it strikes the mirror
There is not a specific cleanser that you need to use on your sony camera lens. You can use any that is made to clean camera lens' As long as they say that they are camera lens safe and that is what they were made for then you can use it!
Most photographers would consider an slr to be "normal". If it's not an slr or a tlr, then you must be referring to a range finder camera or monorail camera. I presume range finder. Thus the major difference is that an slr system presents to the viewing eye pretty much everything that the lens is bringing to the film (minus the parts where the circular image lies outside the film rectangle). A range finder attempts to do this with a separate small viewing lens usually mounted on the camera face off to one side of the lens. The angle of view of the main lens is not the same as the angle of view of the viewing lens, which is usually not a problem. But if you are close enough to a subject such as a flower and you place the camera according to what you see in the viewfinder, you will be too far off to one side and will get less than the whole flower in the picture. This effect is known as parallax.
Any telescope will do this but traditionally the old fashioned brass telescopes were refracting telescopes.A refracting or refractor telescope is a dioptric telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used in other devices such as binoculars and long or telephoto camera lenses. == ==
The short focal length of a camera lens is so that the image the lens forms is small and can be focused on a piece of light-sensitive film.
its all about the glass (lens)
When taking long-distance nature photos, your lens is more important that the megapixels of the camera. Any DSLR (digital single-lens reflex cameras) should work well, paired with a good lens like a 600mm F4.
A refracting telescope is a type of telescope that has a large thin lense at the front and a smaller thicker lense at the end where the eyepiece is. Refracting telescopes use lenses unlike reflecting telescopes that use mirrors to reflect the light. This is a good image of a refracting and reflecting telescope: [See related link]
Your typical 35 mm SLR is designed to have the lenses changed while the film is in the camera, so it won't hurt a thing. I suppose it's possible that there is a camera out there that doesn't allow the lens to be changed mid-roll, but it's not likely. Usually the shutter is behind the lens, so no light will fall on the film from changing the lens.
That is a tricky question, but it would be best to use two cameras, at the very least. Use one with long lens, something within the range of 70-200mm. Partner that with another camera with a wide angle lens, since this one would be great for candid shots and tight spaces.