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Why still cameras don't record video at full sensor resolution or shoot full-resolution bursts at video frame rates

My camera can capture high-resolution stills, but its video mode is limited to much lower resolutions such as 1080p. Why can't a camera simply record video using the sensor's full still-image resolution? Also, during vi

Which lens is better for sharp full-body portraits on full frame: 50mm f/1.8 or 85mm f/1.8?

I shoot full-body portraits on a full-frame camera and currently have both a 50mm f/1.8 and an 85mm f/1.8. If I want the subject to look sharp while still getting some background blur, will one lens give noticeably bette

When is full-time manual focus override useful?

Lens reviews often praise “manual focus override” or “full-time manual focus,” which lets you turn the focus ring even while the lens is set to autofocus. I rarely use it and usually select the AF point myself, so I’m wo

Are crop-sensor cameras worse than full frame?

Why do many photographers prefer full-frame cameras over crop-sensor models? It seems like a crop sensor gives more reach with telephoto lenses, which can be useful and cost-effective. I understand that matching the same

Why do full-frame lenses have different diameters?

Why can two full-frame lenses have different physical diameters even though both cover the same FX/full-frame sensor? For example, a Nikon AF-S 70-300mm is about 80mm in diameter while a Nikon AF-S 50mm is about 74mm. Do

Can you use a 0.71× focal reducer between a full-frame 24mm f/2 lens and a full-frame Sony A7S II?

I have a Zuiko OM 24mm f/2 and a Sony A7S II. What happens if I put a 0.71× focal reducer between this full-frame lens and a full-frame camera? My thought was that the reducer would make it behave like roughly a 17mm len