Comparing Olympus 4/3lenses to FX "Full Frame" offerings

Started 8 months ago | Discussions thread
boggis the cat
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'Best format' anxiety
In reply to dave gaines, 8 months ago

The 'equivalent photographs' (abbreviated by some as 'equivalence') argument works both ways.

What this boils down to in practical terms is that if you shoot at medium distances at medium to wide angle and want a shallow depth of field (e.g. a typical 'head and shoulders' portrait at 85 mm EFL) then a 135 format system will give you an advantage.  If you want to shoot subjects at longer distances using narrower angle and do not want a very blurred image due to a very narrow DOF (e.g. people 100 ft or more away at 300 mm EFL) then a smaller format system will give you an advantage.

Deciding whether you need to move 'up' or 'down' in format (e.g. between 135 and FourThirds) is easy enough to do.  Review your shots: if you find that you have a lot of shots at wide-open aperture where you would prefer a shallower DOF then you may benefit by moving to a larger format; if you find that you have a lot of shots where you have a small aperture (and high ISO and / or low shutter speed) in order to get a sufficiently deep DOF then you may benefit from moving to a smaller format.

If it appears that you may benefit from changing format, then start looking at the costs and trade-offs involved.

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