Compact DSLR vs. OM-D

Started Mar 30, 2013 | Discussions thread
Lost in Time
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Re: Compact DSLR vs. OM-D
In reply to Alumna Gorp, Apr 1, 2013

Alumna Gorp wrote:

Since when has noise and depth dof been true equ.

All that really counts is reach and light gathering ability, both wiill gather equal amounts of light at the same apertures.

A 70mm f2.8 lens is not the same as a 35mm f2.8 lens. The longer focal length will show a noticeably smaller depth of field. The earlier poster was exactly correct: given equal technology, the 35-100m f2.8 on u4/3 at ISO 200 is equivalent to a 70-200mm f5.6 at ISO 800 on FF. Both will have the same exposure time and the same image noise: the images will be identical.

What the FF gives you is the option to shoot at lower ISO with a slower shutter speed for less noise, or at a lower f-stop for shallower DOF and/or faster shutter speed. You gain flexibility but loose out only in the sheer size and weight of the lens on FF, not to mention cost.

Of course, things are not equal. Many FF sensors are not as efficient as newer u4/3 sensors (don't mention Canon...), and none currently try to approach the same pixel density. Also, there are usually many more high-performance and specialised optics for FF, often with much higher IQ. For example, people fitting adapted Leica lenses to their u4/3 cameras (which is actually a terrible waste of glass, as you are only using 1/4 of the captured image...).

Unfortunately, *most* u4/3 lenses today are engineered to be cheap consumer solutions - such as the seemingly endless number of new kit zooms that seem to be released. This will improve as better high-end bodies such as the OM-D and GH3 are released, but as of now there are simply many more high-quality lenses for FF (with size, weight and price tags to match - look at some of Canon's long focal length fast primes, for example).

Hopefully Olympus will eventually port some of their original 4/3 lens line-up to u4/3 - weather sealed lenses with excellent quality and fast apertures.

All cameras are tools. There are times where small and unobtrusive are essential, and times where flexibility, noise and shallow DOF matter more. There is a lot more to taking an image than fretting over high-ISO noise and light gathering capability and will never be a single "does it all" solution for the reasons given above.

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