Can't believe I just read these past two pages...who cares?
This^^^^^^
Time to unscubscribe!
Can't believe I just read these past two pages...who cares?
I am just wandering what your opinion may be...
If there was a shootout on an Leica M9, ME, OR a Olympus E-M5 with adapter for non-Leica mount lenses
....with a controlled target and lighting, Which lens would would it be?
Remember: it must be able to be bought NEW/USED for UNDER $4,000.00
(please don't get side tracked by sensor size. Stay on topic 🙂)
Dear Roland,Three points:
1) No 35mm or smaller sensor has been built yet to match the resolution available from many modern lenses. I can give you at least a handful of lenses that are "sharper" than any 35mm sensor. On top of this list is the ZM 25/2.8.
2) "Sharp" has no meaning unless you specify desired contrast as well.
3) As noted above you have to define object distance. Then again, for anything else but infinity, the camera comes into play, via inaccurate mirror or rangefinder alignment, or for a finder/mirror-less camera via accuracy of focus mechanism. When you focus peak, what's your resolution in pixel ? MTF charts and serious resolution tests are usually done using focus bracketing. Which your "Gedankenexperiment" does not account for.
Roland.

Three points:
1) No 35mm or smaller sensor has been built yet to match the resolution available from many modern lenses. I can give you at least a handful of lenses that are "sharper" than any 35mm sensor. On top of this list is the ZM 25/2.8.
2) "Sharp" has no meaning unless you specify desired contrast as well.
3) As noted above you have to define object distance. Then again, for anything else but infinity, the camera comes into play, via inaccurate mirror or rangefinder alignment, or for a finder/mirror-less camera via accuracy of focus mechanism. When you focus peak, what's your resolution in pixel ? MTF charts and serious resolution tests are usually done using focus bracketing. Which your "Gedankenexperiment" does not account for.
Roland.
Hang on. You DON'T know what you mean. So you don't know what they mean either. So what is the point of the question?@RogerH
I don't know what I mean.😱.. I was just asking a simple Q from another forum, where, there was not much detail on how the test would be conducted.
just found out a few more details (urged by everyone on this forum who have asked good questions about different qualifiers)
The competition will be photographing a standard ISO Sharpness Test Chart to fill the frame. 4:3 or 3:2 ratio has not been set yet. depending on FL, 10-20 feet?
Not sure if "Overall" (Average), "Center", or "Center & Corner" results will be the final factor.
Good point about "Flat Field" or not.
Again, I am not conducting this competition, just asking for a lens that you consider sharp (est).
Since many shooters here do have or have used some of finest lenses made...So, I value your input.
Hang on. You DON'T know what you mean. So you don't know what they mean either. So what is the point of the question?
I've used LOTS of sharp lenses -- which is why I consider the question valueless.
Cheers,
R.
1 CahorsHi Roger,
Talking of valueless questions, what did you drink with dinner today? Have you finished the short story you were writing? How is your wife's health?
1 Cahors
2 Yes
3 Better, thank you
At least those are ANSWERABLE questions. What was your point?
Cheers,
R.
Hang on. You DON'T know what you mean. So you don't know what they mean either. So what is the point of the question?
I've used LOTS of sharp lenses -- which is why I consider the question valueless.
Cheers,
R.
No spinning. There are still endless unanswered questions. You're probably going to be using a lens designed for one format on another, so edge sharpness WILL vary; the 'frame filling' requirement is effectively arbitrary; optimum aperture still appears to be absent from the considerations; I do not recall any comments about % contrast; Nyquist considerations have not been mentioned as far as I recall; as far as I can see, your chums' 'test' will at best give a subjective and flawed result for one camera that most people don't use. What is the value of this test?Don't spin what I said...
I was asked a simple Q, I asked that same Q here, You all asked me to be more detailed, I have been more detailed,The sensor may have a play in it... but, probably a marginal part, since, any sensor will still show similar results, albeit even though it may record less.... (IE: as long as every lens is tested on the same camera--hence a camera that can mount ANY lens. A NEX can not, An m4/3 can). BUT, it will work across the board for all the lenses. So, the final results as far as the ORDER of sharpness of each lens will not change. #1 in sharpness, will remain #1 regardless of the sensor. As long as ALL the lenses are tested on the same house.
- You NOW know, a Standard Sharpness Chart will be used,
- you also NOW know that the framing will be to fill the VF with the chart,
- You Now know that LIVE VIEW will used to focus in MF Mode.
- You NOW know that the chart IS THE basis for lens sharpness.
- You NOW know the same camera will be used for the test.
No spinning. There are still endless unanswered questions. You're probably going to be using a lens designed for one format on another, so edge sharpness WILL vary; the 'frame filling' requirement is effectively arbitrary; optimum aperture still appears to be absent from the considerations; I do not recall any comments about % contrast; Nyquist considerations have not been mentioned as far as I recall; as far as I can see, your chums' 'test' will at best give a subjective and flawed result for one camera that most people don't use. What is the value of this test?
I apologize if any of the above points has been addressed, and I've not noticed. Please don't let me discourage you from investigating. The results might indeed be of very slight interest to a few people with access to the same lenses and camera (though of course the camera will probably be obsolete shortly). But what is anyone hoping to demonstrate that is of any widespread or real-world value?
Cheers,
R.
If sharpness in the final image is your sole criterion, stop piddling around with small formats.
Cheers,
R.