What are aspherical lens elements and why are they used in some telephoto lenses?
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what is a telephoto lens
- How does the aperture setting influence the size and shape of the bokeh? How does focus breathing, a change in focal length as the lens focuses, affect the framing of video shots taken with a telephoto lens?
- What are some focusing aids available on modern cameras that can assist with manual focusing? How does the image stabilization in a telephoto lens interact with the in-body image stabilization (IBIS) found in some cameras?
- How do third-party telephoto lens manufacturers compare to the camera brand's own lenses?
- What is the depth of field like with a telephoto lens?
- What are the specific requirements for telephoto lenses used in filmmaking?
- Is it better to use a longer telephoto lens or crop an image taken with a shorter lens?
- What are the tolerances and precision required in telephoto lens construction?
- What is the magnification ratio of a typical telephoto lens? What are diopter lenses and can they be used with telephoto lenses for increased magnification?
- What are some techniques for getting sharp and well-exposed images of fireworks with a telephoto lens?
- What are the specific optical requirements for telephoto lenses used in microscopy or telescopy?
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