Photographers: Can you tell me what difference between a 50mm 1.8 and 50mm 2.5 lens for Canon?

Photographers: Can you tell me what difference between a 50mm 1.8 and 50mm 2.5 lens for Canon?
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1 Answer

Answer :

answer:The f1.8 lens (assuming this is a fixed aperture, and not adjustable to different f-stops) will be suitable for work in low-light conditions, since its opening to permit light is larger than an f-2.5 lens. However, it will also have a very shallow depth of field, meaning that anything that’s not directly focused on (at anything less than “normal portrait distance”) will be blurred. So, for close up work, which you indicate you like to do, the higher f-stop lens will give you a deeper depth of field, if only slightly.
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