How can Oly EM-1 compete when FF DSLR with L zoom goes for $2300?

Started Sep 1, 2013 | Discussions thread
Elix Regular Member • Posts: 298
Re: Size, telephoto, not much better IQ...

ultimitsu wrote:

Elix wrote:

ultimitsu wrote:

Elix wrote:

Not really.

Canon 500mm f/4 II USM - $10,400

14.48 x 38.45 cm - 3.19 Kg.


Olympus 90-250mm f/2.8 ED Zuiko - $6,000

12.47 x 27.69 cm - 3.69 Kg

The 500/4 is a far superior lens and one full stop faster.

Can you tell me how f/4 is one stop faster than f/2.8 ?

The "F" in canon F/4 is 500, the result is 125mm aperture opening. The "F" in oly F/2.8 is 250, the result is 89mm aperture opening, which passes only half as much light as 125mm.

So to get the same amount of light onto the sensor, you shutter speed has to be twice as long/slow on the 250 F2.8.

Well, you shoudl educate youself a little more, being the sensor smaller, it does not need the same amont of light. However, it will need the same amount of light per-pixel.

There is no f/stop equivalence across different sensor (or film) sizes (despite what you think) . f/stops are what they are, end of it.

 Elix's gear list:Elix's gear list
Sony RX100 Olympus OM-D E-M5 Olympus E-M1 Olympus M.Zuiko Digital ED 9-18mm F4.0-5.6 Panasonic Leica Summilux DG 25mm F1.4 +3 more
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