Back by popular demand: Nex-7 vs OMD

Started 6 months ago | Discussions thread
LTZ470
Senior MemberPosts: 7,925
Like?
Re: Back by popular demand: Nex-7 vs OMD - Part II
In reply to spacemn, 6 months ago

spacemn wrote:

viking79 wrote:

spacemn wrote:

LTZ470 wrote:

blue_skies wrote:

LTZ470 wrote:

This is all I asked...correct or false?

A larger sensor should enable one to shoot higher ISO as it gathers more light?

--
--Really there is a God...and He loves you..
FlickR Photostream:
www.flickr.com/photos/46756347@N08/
Mr Ichiro Kitao, I support the call to upgrade the FZ50.
I will not only buy one but two no questions asked...

A larger pixel site would. Image resolution then depends on the total number of pixels.

Typically, camera manufactures keep pixel counts very high, at the cost of high ISO noise. The smaller the sensor, the smaller the pixel site, the lower the useable ISO range.

Re-read my longer post, the EM-5 overstates ISO and this is confusing. It is truly a lower ISO camera.

--
Cheers,
Henry

SO if what you say is so then How does the EM5 at ISO 200 compare to Nex-7 at ISO 100? Your saying that the EM5 is actually at ISO 50? And Olympus is lying about ISO?

Hard to believe to say the least?

...

This may answer your question:

The ISO discussion has nothing to do with sensor size. It is a discussion of what the manufacturers are saying the ISO in their cameras are vs the actual ISO.

On the graph you can see that when the OMD shows ISO 6400, then the measured ISO (measured sensor sensitivity) is actually 3200. Whereas the NEX-7 is very close to measured ISO 6400 when claiming it.

Yes, ISO 200 on OMD is actually measured to 100. For NEX-7 ISO 100 is measured to around 80 for some reason.

This is what "cheats" the user in believe that they are using IS06400 in the OMD when they actually only are using what is equivalent to ISO3200.

That DxOMark graph has nothing to do with whether or not the sensor is "cheating". You are mis-interpretting that graph.

DxOMark has to determine that ISO number in order to compare them on equal ground. Typically, cameras further from the actual ISO (below) are better performing sensors. Typically, all that means is that the manufacturer might be trying to prevent clipped highlights by push processing the exposure.

Any review sites should easily catch this by shooting in manual exposure mode.

Eric

...

I think you are misunderstanding what I am saying. I am not saying that the sensor is "cheating". Only that Olympus has labelled their ISO values differently than for example Sony.

Well, DPReview did not catch this, because when comparing ISO6400, then the OMD shutter speed is half of what the NEX-7 was taken with. This is only apparent when you download the photoes and examin the EXIF data.

Besides I am trying to help LTZ470 understand this measured ISO VS manufacturer ISO

If you use same f/stop for both, then of course the shutter speed will be slower on the smaller sensor?

--
--Really there is a God...and He loves you..
FlickR Photostream:
www.flickr.com/photos/46756347@N08/
Mr Ichiro Kitao, I support the call to upgrade the FZ50.
I will not only buy one but two no questions asked...

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow