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What is the difference between a fixed lens and a manual zoom lens? When do I need to use a fixed lens and what is the benefit of using a fixed lens over using manual zoom lens?

April 26, 2017benefit difference fixed Lens manual zoom

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What is the difference between a fixed lens and a manual zoom lens? When do I need to use a fixed lens and what is the benefit of using a fixed lens over using manual zoom lens?

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A fixed lens has no zoom capability, so the field of view is fixed. Usually the fixed lens has a larger maximum f stop (aperture), which means more light is being sent to the camera. This is better for chemiluminescence since the exposure time ends up faster (shorter).