Originally posted by LaurenOE No, I never said "who cares about sharpness"
Neither did I -> As Noted
my response was in direct response to laurens about "who care about corner sharpness" (well, that was shortened)
You did however in your post mention:
Quote: In ANY photograph I take, I have never used the 10-20% around the periphery of any given image. No one cares aesthetically what is at the extreme edges of a photograph
Hence, Edge Sharpness
And:
Quote: the center/color/sharpness are what matter to me in a lens
Hence, Not Worried About Corner Sharpness
And:
Quote: No one cares aesthetically what is at the extreme edges of a photograph
With the above quoted was what I directly quoted, and well really to sum it all up:
Quote: my response was in direct response to laurens about "who care about corner sharpness"
Sounds pretty dead on or did I misinterpret something?
Originally posted by LaurenOE Name one time any image was looked at and someone went to the extreme corner and said "Gee, it's not sharp out here".
I can probably look back into some old printing contracts that are boxed up and give you quite a few, but I do remember one back when we printed yearly the Thelonious Monk International Jazz Festival Magazine (the particular one was either '98 or '99), I remember this one clearly as it was an article about Bill Cosby and the start page for the article was a full page spread - during the press inspection there was a big inconsistency across the photo, beautifully printed but clarity across the page shifted and shifted pretty quick from about 15% on the left into the spine - after going through hours upon hours re-shooting negatives and burning plates and looking for registration issues, it was found that the photograph itself was the issue.
Wonder how many of the millions upon millions of stock photography out there that is shunned because of IQ inconsistencies every minute of every day - I can guarantee one thing that is certain fact, if anyone on this forum was tasked with purchasing big ticket photography for national publications or high end print work from places like Getty or the alike you will definitely be concerned with edges then because it is your money purchasing the product.
@normhead
APS-C vs FF lens cropping at the sensor:
I am not technical on this and do not know the actual internal methods of it but as I understand it there is somewhat of a difference between sensor cropped and post cropped, I believe the difference is the sensor or internal algorithm is actually pixel optimized for this which in return yields near (or even) loss'less IQ. [again, I have like zero knowledge on this and only noting what I have read in the past]
Originally posted by normhead Oh ya and spending money for expensive lenses means you care more about edge sharpness than others. Ya, you have a few gems here.
Well, not really - my kit is pretty specific and detailed:
Sigma 70~200 OS FLD (Recently Purchased After Couple Months of Pondering)
This lens was specifically purchased for Sports and [Nighttime] | [Indoor] Concerts. What a Juggernaut of a lens this thing is even wide open this thing is insanely good.
DA*50~135mm (Purchased Used From Member Here)
This lens was specifically purchased for [Nighttime] | [Outdoor Bad Weather] | [Indoor] Concerts, I have however used it for a few other things.
Sigma 15~30mm
This may be my best gem - what an absolute killer performer this thing is.
Tamron 28~75mm
Pretty good lens, lacks many features but a good one to have.
I also have a couple of macros and some primes. None of my lenses were expensive, the 70~200 tops the chart at $1300 but that was an absolute must have lens for my kit.
Originally posted by normhead But wait, croppping unsharp edges would be a crime for you, because cropping is also a crime.
It's not crime, it does however create issues depending on the presentation medium - example:
- I need a photo for a national ad, my photo will be part of an overall ad that covers a half page horizontal block.
- The photo will be the main visual of the ad and will have a page and a spine bleed.
- The photo must be supplied at 8.965" width by 5.625 inches high at 300ppi.
Shooting the above with a K5 (and a consumer grade lens), this would be using the entire image as outputted by the K5 (4928x3264 <- No Enlargement @ 300ppi -> 8.965" x 5.938"). Those dimensions are directly from the camera.
Lets say you crop out 50% of the original photo, the photo must be converted and enlarged to twice it's supplied size - the image has pretty much become a pixelated mess at this point and would be hard pressed to use in even newsprint. This is where higher resolving/resolution lenses can be somewhat of a god send and can help with cropping considerably - the example yielded an unusable photo because of shooting with a consumer grade lens, a pro grade lens with it's resolving power would have at least got it to newsprint.
Originally posted by normhead I don't dispute MTF is good for evaluating flat image renditions. You've yet to convince me it's worth much evaluating lenses for use in a 3D enviroment. But hey, I'm open to arguments technical arguemnts or examples. I don't care whether I'm proved right or wrong. I'm just looking for info. And trying to understand how my 21 ltd rated 1.5 out of 5 with terrible MTF numbers takes such great images.
I reference MFT specifically for resolution and nothing else - a high(er) resolution chart for a particular lens vs another manufacturers MFT chart for the comparable lens is just how I judge before purchasing (and considering the application at which I will be using it for). For your 21ltd, I am not sure of the numbers vs great images MFT confusion, I just don't know about that - could it be specifically it's resolution? Have you compared 90% crops of the same framing against another lens? I would think that may reveal something.
Originally posted by normhead All you have to say here is, from your long experience pixel peeping, lenses with great MTF numbers across the frame produce better across the frame sharpness in rendering 3D scenes. Now, that at least for me, would be the kind of statement I would make note of.
I can't say that as I never have compared images in that way and also my earlier posts were directed specifically at edge (or corner) sharpness which could also be an issue with some high resolving lenses as it is with some consumer grade lenses.
Originally posted by normhead From my 1.5 out of 5 rated 21 ltd. It's not MTF ( 2D )sharp, but I like it's 3D rendering ability.
Awesome pic just like your others!