newbie questions re: compact vs. mirrorless vs. SLR vs. rangefinder

Started Aug 22, 2011 | Discussions thread
noirdesir Forum Pro • Posts: 13,255
PD-AF for continuous and low DOF AF + EVFs still suck a little
  • Contrast detect AF (essentially AF using the actual image feed) still is far from delivering continuous AF, only PD-AF can do this and you need some sort of mirror for this. Equally CD is still very slow for low DOF lenses, the 45 mm f/2.8 Pana-Leica macro is one with relatively low DOF close-up but close-up its AF performance also is not great. The Sony E-mount 50 mm f/1.8 is so far the lens with the lowest DOF that relies on CD-AF. 85 mm f/1.4 lenses are still some way of from being focusable with CD-AF, note how Samsung is hesitating to release its version for the NX system. 200 mm f/2.8 would be yet another step into low DOF territory, not to speak of the exotics like 300 mm f/2.8 or 500 mm f/4.

  • Electronic viewfinders still don't feel as great as optical ones, see this quote from Michael Reichmann:

"The EVF on the A77 is the largest, brightest, highest resolution and most contrasty electronic viewfinder yet (...) it's very good – for an EVF. (...) it is much preferable to the dim and small reflex viewfinders found on most reduced frame DSLRs. (...) how does it compare to the viewfinder on a full frame DSLR. Not so well. (...) Sony's new OLED EVF, as good as it is, (...) doesn't quite deliver."

"As one moves from bright to dark areas the viewfinder's brightness pumps. (...) An optical viewfinder allows the eye to compensate for brightness differences."

"Outdoors (...) shadow areas can become blocked up. In low light (...) it gives an unrealistically bright and contrasty impression of the scene in front of it, and also one that gets grainy as the VF's amplification is boosted to enhance visibility."

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