[Guest]

I noticed on full frame tests, a lot of lenses just take a dump for borders and extreme borders but do very well in the center. Is there any reason not to test the outer center, roughly between the center and borders?

[mst]

The simple reason is: lack of time <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='' />



Seriously: of course we could test more than just 3 spots. But there's simply a limit of what we can do in the time we have available.



-- Markus

[Guest]

perhaps move the borders just a little closer to the center?

[Klaus]

[quote name='mst' timestamp='1297673412' post='6097']

The simple reason is: lack of time <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/wink.gif' class='bbc_emoticon' alt='' />



Seriously: of course we could test more than just 3 spots. But there's simply a limit of what we can do in the time we have available.



-- Markus

[/quote]



It's also a question of real value-add. For tele lenses you're primarily interested about what happens in the center region and for standard lenses or wide-angles you'd like to have a good performance across the image field.

So an additional "mid-field" spot doesn't seem to be that hot.

[Klaus]

[quote name='ben4345' timestamp='1297673729' post='6098']

perhaps move the borders just a little closer to the center?

[/quote]



Well, the "borders" are ~75% off the center towards the corners.

[joachim]

[quote name='ben4345' timestamp='1297672954' post='6096']

I noticed on full frame tests, a lot of lenses just take a dump for borders and extreme borders but do very well in the center. Is there any reason not to test the outer center, roughly between the center and borders?

[/quote]



On PZ many lenses get reviewed twice: Full frame and APS-C. Since you seem interested in FF, the APS-C results give some guidance about the points you ask about. For sure there are many caveats to this - as Klaus for good reasons tends to point out fairly regularly: measurements are not comparible between systems. So take my statement with a grain of salt.

[genotypewriter]

[quote name='Klaus' timestamp='1297675266' post='6100']

Well, the "borders" are ~75% off the center towards the corners.

[/quote]

As I've said before, 75% off the image circle center doesn't correspond to a significant area of the frame:



http://www.flickr.com/photos/genotypewriter/5207301499/



Sorry, I have to agree with the OP...



GTW

[Klaus]

[quote name='genotypewriter' timestamp='1297750262' post='6119']

As I've said before, 75% off the image circle center doesn't correspond to a significant area of the frame:



[url="http://www.flickr.com/photos/genotypewriter/5207301499/"]http://www.flickr.co...ter/5207301499/[/url]



Sorry, I have to agree with the OP...



GTW

[/quote]



Sorry, we will not do this. There're are other, more important enhancements that we're thinking about (flare).

If we test the lens on APS-C and FF you can get an idea about the outer center in the ASP-C test.

[Guest]

[quote name='Klaus' timestamp='1297753911' post='6121']

Sorry, we will not do this. There're are other, more important enhancements that we're thinking about (flare).

If we test the lens on APS-C and FF you can get an idea about the outer center in the ASP-C test.

[/quote]





But not all lenses you test on full frame never make it to the APS-C review. Nikon 24-120mm f/4 VR2 *hint hint.

[mst]

[quote name='ben4345' timestamp='1297758428' post='6122']

Nikon 24-120mm f/4 VR2 *hint hint.

[/quote]



Will follow.



-- Markus