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Comment by johnwhit posted on Some new lenses at 07/07/2011 - 17:45
rparmar wrote:
Or try this, if your brain goes into overload, as mine just did, just skip to the conclusion:johnriley wrote:
Pentax themselves have said that we're at the limit of where these Limited lenses can perform
Is that just from a comment Ned made on his blog? Or is there another source?Pentax themselves have said that we're at the limit of where these Limited lenses can perform
http://www.luminous-landscape.com/tutorials/resolution.shtml
John
Comment by johnwhit posted on Some new lenses at 07/07/2011 - 17:33
rparmar wrote:
I believe the resolution limit of some of the best prime lenses available is somewhere just North of 15MP (16MP?) so adding more resolution to the sensor is basically futile, unless you increase the size of the sensor. The following is quoted from the Canon 7D (18MP) test on Photozone:johnriley wrote:
Pentax themselves have said that we're at the limit of where these Limited lenses can perform
Is that just from a comment Ned made on his blog? Or is there another source?Pentax themselves have said that we're at the limit of where these Limited lenses can perform
"The EOS 7D features the highest resolution APS-C sensor tested to date. For whatever reason Canon wants to be light-years ahead here compared to the competition which is currently using 12mp or max. 14mp sensors. It's surely a great marketing argument but, as always in the real life, there's something called "diminshing return upon investment" and this effect is also hitting the EOS 7D."
"The results aren't really surprising - while the EOS 7D is capable of delivering a slightly higher effective resolution than the lower MP DSLRs it is actually not exceedingly better. The data represents the center resolution @ ISO 200 using our benchmark lens at its sweet spot (Zeiss ZS 50mm f/1.4 @ f/4). It may well be that the camera is able resolve more than that using better SLR lenses but you'll have a hard time finding those actually. There're probably no zoom lenses out there qualifying here."
http://www.photozone.de/dslr_reviews/478_canon_eos_7d?start=2
John
Comment by johnwhit posted on Some new lenses at 07/07/2011 - 16:51
thoughton wrote:
I recently read your ephotozine review of the 31mm John, and I was surprised that all of the sample images you posted are at f8 and f11. Was there any reason you decided not to test it at larger apertures?
I was curious about this too, however most of the sample images would benefit from the DoF provided by smaller apertures apart from the close portrait. I must say though that the lens in probably being limited by diffraction @ f/11, the optimum being between f/4-f/5.6I recently read your ephotozine review of the 31mm John, and I was surprised that all of the sample images you posted are at f8 and f11. Was there any reason you decided not to test it at larger apertures?
If I ever win the lottery I want one, in black, from the original batch assembled in Japan
John
Comment by johnwhit posted on FA Limited lenses at 07/07/2011 - 13:30
Algernon wrote:
I've only got a Sigma 10-20mm that goes to 18mm and to be honest the Kit lens would eat it for breakfast
Well I'd sell itI've only got a Sigma 10-20mm that goes to 18mm and to be honest the Kit lens would eat it for breakfast
John
Comment by johnwhit posted on Help me choose at 07/07/2011 - 11:11
Algernon wrote:
Test done in very dull weather... rained 2 mins later.
The 43mm at f/8 is on the Left
The 18-55mm Mk2 Kit Lens is on the Right
Both 43mm focal length f/8 at 1/100th 200ISO K-5
The 43mm is just slightly better as would be expected, but
no sign of any soft corners on the Kit Lens. Now from
all tests 24mm to 43mm
-
Slightly better, by this you mean, higher definition, higher contrast, less CA and better colour rendering:Test done in very dull weather... rained 2 mins later.
The 43mm at f/8 is on the Left
The 18-55mm Mk2 Kit Lens is on the Right
Both 43mm focal length f/8 at 1/100th 200ISO K-5
The 43mm is just slightly better as would be expected, but
no sign of any soft corners on the Kit Lens. Now from
all tests 24mm to 43mm
-
I think a better test for how the lens performs on landscapes would be to try the edges at 18mm, after all this is roughly equivalent to 27mm FoV on a film camera, not far removed from the classic 28mm.
John
Comment by johnwhit posted on Help me choose at 07/07/2011 - 10:10
vrapan wrote:
Forgive my ignorance but I haven't had even time to read through my K-5 manual yesterday so I don't even know the technical difference of the above two options. I will do that later today.
The actual question I'd like to ask though is, is there a visible material difference between the two? Do you all use it? I am wondering cause I do my image processing through a two year old MBP which was struggling with the RAW files from the D40, I am worried the RAW files of a K-5 are going to be exponentially more challenging and feeding them even bigger ones in the form of RAW+ is something that I wouldn't mind avoiding if there is no much benefit to them.
Thanks a lot !
RAW+ is RAW + jpeg, you get a RAW file plus a jpeg image, I don't have the K-5 but on the K20D it reduced the number of frames in burst mode that can be captured consecutively. Hope this makes sense.Forgive my ignorance but I haven't had even time to read through my K-5 manual yesterday so I don't even know the technical difference of the above two options. I will do that later today.
The actual question I'd like to ask though is, is there a visible material difference between the two? Do you all use it? I am wondering cause I do my image processing through a two year old MBP which was struggling with the RAW files from the D40, I am worried the RAW files of a K-5 are going to be exponentially more challenging and feeding them even bigger ones in the form of RAW+ is something that I wouldn't mind avoiding if there is no much benefit to them.
Thanks a lot !
Beat me to it John
John
Comment by johnwhit posted on Raw vs Raw+ at 07/07/2011 - 09:35
Both the MkI & MkII kit lenses are decent lenses, however I believe Pentax were right in updating the optical formula as the sensor resolution increased. I still have the 18-55 and used it a couple of years ago on a holiday in Scotland with good results, it was the only lens I took. Optically Nikon make a good kit lens, but the build quality resembles something that fell out of a kids "Lucky-bag" when compared to the Pentax.
John
John
Comment by johnwhit posted on Help me choose at 06/07/2011 - 20:18
Algernon wrote:
This one:
http://www.flickriver.com/search/35mm+flektogon/
which as you can see is an Excellent lens with a lot of
character and gorgeous bokeh. nice colours as well
Highly overated IMHO.This one:
http://www.flickriver.com/search/35mm+flektogon/
which as you can see is an Excellent lens with a lot of
character and gorgeous bokeh. nice colours as well
John
Comment by johnwhit posted on Help me choose at 06/07/2011 - 18:52
rparmar wrote:
There is no way in heaven the FA43 should consistently have half the border score of the FA31 and DA70. (Only wide open would I expect this number to be so poor.) My only conclusion is that there is in fact some issue with the test you did. This might be down to a bad sample since I am sure you followed procedure and took due care.
The other difference is the camera used. You use a K-5, I use a K20D and Photozone tested with a K10D. I cannot imagine this would matter so much, and if it did would not all three Limited lenses have skewed scores?
I'd concur with this, the results are so far removed from all other tests I've seen that they bear no resemblance.There is no way in heaven the FA43 should consistently have half the border score of the FA31 and DA70. (Only wide open would I expect this number to be so poor.) My only conclusion is that there is in fact some issue with the test you did. This might be down to a bad sample since I am sure you followed procedure and took due care.
The other difference is the camera used. You use a K-5, I use a K20D and Photozone tested with a K10D. I cannot imagine this would matter so much, and if it did would not all three Limited lenses have skewed scores?
John
Comment by johnwhit posted on Some new lenses at 06/07/2011 - 18:49
So no other way but to build bigger sensors for higher resolutions? APSC+
John