A7r 24-70 at 70mm vs EM1 12-40 at 40mm (80mm EFL)

Started 9 months ago | Discussions thread
viking79
Forum ProPosts: 13,784Gear list
Like?
Re: Please Read more carefully...I did, but I looked even more carefully....
In reply to LTZ470, 9 months ago

LTZ470 wrote:

viking79 wrote:

LTZ470 wrote:

viking79 wrote:

LTZ470 wrote:

Camley wrote:

LTZ470

If I understand what you have done (and I am not sure that I do!), it isn't a fair comparison at all.

What matters is that you compare images from the same size print. This has been discussed in multiple DPreview forums.

You must either enlarge the m4/3 image or reduce the size of the a7r image to do this or you are looking at per-pixel sharpness. Per-pixel sharpness favours cameras with lower pixel count.

The Nikon 800E users went through this incorrect way of comparing images in great detail. If I remember correctly there was someone who refused to accept that you can't simply compare per pixel sharpness.

So 100% may be 100% but you must normalize the print size.

To achieve a 100% crop of ANY photo you have to open with a program that opens them at 100% then you can make a 100% crop from that photo by cropping/cutting out any portion/area then Save As, this will give you 100% Crop of the photo...

Paint on Windows does this and Paintbrush on Macbook does this...

Anything else that does not do this is not a fair comparison at all...I.E. resizing...or making one photo crop 150% with the other being 100%...

Folks will try and make you believe anything, but 100% is 100%, NO ONE can change that...not even the forum experts, even though they would love to sell us the "used car with the great tires'..

Please, go read my thread carefully (http://www.dpreview.com/forums/post/53254339) and re-read Camley's thread, and post if you have questions. You are not comparing the same thing, you are magnifying the higher MP image more.

Eric

I have and fully understand ONE thing: 100% = 100%...no getting around that...sorry we will have to agree to disagree...

Fair enough. 12-40mm = 12-40mm and 24-70mm = 24-70mm, yet we convert to equivalents. 100% crop on 16 MP does NOT equal 100% crop on 36 MP sensor when field of view is the same for original image.

100% crop on A7R for same field of view image equals 2x higher magnification.

Eric

The file sizes are basically the same after making the 100% Crops...this is basically 1/10 of the A7r shot...

This is not 100% Crops but equal crops~...

You clearly have an agenda here.  I am sorry, I am done with this thread.

The rest of the frame shows differently.

Eric

 viking79's gear list:viking79's gear list
Sony Alpha 7R Samsung NX1 Samsung NX 30mm F2 Pancake Samsung NX 85mm F1.4 ED SSA Samsung NX 60mm F2.8 Macro ED OIS SSA +5 more
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