Question about Panasonic Lumix G Vario 100-300mm F4-5.6 OIS

Started Mar 27, 2013 | Discussions thread
Anders W
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Re: Question about Panasonic Lumix G Vario 100-300mm F4-5.6 OIS
In reply to LTZ470, Mar 28, 2013

LTZ470 wrote:

Mjankor wrote:

Mjankor wrote:

LTZ470 wrote:

The 75-300 Oly is much slower than 100-300, take my word for it…I have owned and shot both extensively…the 75-300 cannot focus many times when the 100-300 can…the extra light the 100-300 allows is worth it in AF speed and Shutter Speed and it is still a challenge at times with EM5 as they fudged the ISO and the Shutter Speeds are slower than other cameras at equal ISO values, so for Birding and Nature you WILL need the fastest glass you can get on the EM5...

Moving Subject + EM5 + f/6.3 = Blurred photo...

YMMV...

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Too many wrong facts.

Basically, everything about the OM-D fudging ISO is wrong. THE OM-D uses the same shutter speeds (within 1/3 of a stop) as other cameras for any particular camera ISO value, as expected.

For more info, check out the rather long debate here:

http://www.dpreview.com/forums/post/51112064

As for focussing, I suspect that's wrong too. Most reports say the 75-300 is faster at focussing.

Lol…you think I said this because I haven't tested them side X side…MOST folks that say the 75-300 is faster have never owned the 100-300 much less used the two side x side…I have photos to prove my point do they their's?

Same tripod, same camera same distance...75-100 could not acquire focus...100-300 AF'd time and time again without any problems...75-300 really nice sized sweet lens, sharp and godd contrast...BUT cannot match 100-300 for AF or Speed...you WILL miss many shots with 75-300 that the 100-300 would have captured...f/5.6 vs f/6.7 the f/5.6 trumps f/6.7 everytime except in the brightest light...moving subject + 75-300 at f/6.7 + slow shutter speed EM5 = blurred photo...thats all i got to say about that

As far as fudging ISO…lol…again I challenge you (or anyone else) to look at Image Resouces and compare the Shutter Speeds at same ISO's on various models…lets say from Canon 60D, Nex-7, OMD, Panasonic GH2…and come back here and give us the findings...

That way you won't have to take my word for it…savvy?

You are wrong about the "ISO fudging" LTZ. As Mjankor already pointed out, any deduction based on the shutter speeds and f-stops used in these and other studio samples rests on the questionable assumption that the light level is controlled and held constant.

There are other and better ways to check whether two cameras actually got the same light on the sensor at the same camera ISO (checking the saturation of the RAW files and see whether they match what we'd expect based on the DxOMark "measured ISOs" if the cameras have been given the same effective exposure, i.e., the same amount of light on the sensor). I have performed this check for the E-M5 versus a number of other cameras (GH2, GH3, G3, D800) and in no case found anything but marginal deviations.

This subject has already been beaten to death in a large number of other threads and it is perfectly clear at this point that there is no "ISO fudging" going on.

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