Thank you very much for this test, it seems that few people have bought this samyang, so itīs quite diffcult to find test or pics on the web. If itīs somewhere near itīs 35 brother, I think itīll be a winner!
OK, here are some of the test shots.
Here are the Centers of both the 35 & the 24
Trying to keep the target centered was more trouble than I thought, but I think it close enough. The barrel distortion is obvious & I suspect the CA in the corners is too.
Some Commentary.
Trying to keep the target centered was more trouble than I thought, but I think its close enough. The barrel distortion is obvious & I suspect the CA in the corners is too.
The 35mm is a bit sharper than the 24mm, noticeable, but barely.
I think the corners of the 24mm (looking at all of them) are probably a bit less sharp relative to its center when compared to the same, Center/Corner of the 35mm.
This shouldn't surprise as wider angle often have more "roll off".
I have some scene shots, but not satisfied with content & plane of focus information that would make this more objective. The scenes look clean, but will work on this more before I post them. I feel this copy of the 24 is noticeably better then the 1st one, so its probably a keeper.
I probably will get the 14/2.8 "again" as my first copy off of Craigslist was not so good.
Won't take a chance again on CL, but will buy it new from B&H.
Any questions, feel free to ask & critique these.
I am new to this level of pixel peeping quite honestly don't want to do this on every stinkin' lens I get . But with 3rd party lenses, it is worth it sometimes.
Thanks for doing this. With my new D800, I am thinking I need to run all of my lenses through a similar procedure, I need to get some kind of paper test background like you got, though I have seen one somewhere where it was just like all lines or checkered pattern. I think that made it a bit easier to tell where the distortion and such was happening.
24mm looks a hair sharper in the center to my eyes, but the corners are a bit worse. More because of CA I guess, and the magnification in the 24mm shot is lower too. Good test, thanks. What f-stop did you use?
When I get back from Hawaii, will reprocess the shots at a lower sharpening (I think the defaults were used), but think since its true for all of them, the relative IQ is still the same. The 35mm is the known quantity.
If I have time, will do some more tests, at f1.4 & f2.8, but this is not the f-stop I will be using often. These were at f5.6 as noted.
Jim, the link to the Bob Atkins site earlier in the post will get you the access to the test pattern .JPG files.
Thanks for posting, Dan. I too would love to see some test shots at f/1.4 - f/2.8. I'm quite interested in this lens as a low light "bargain" alternative to the Canon 24 f/1.4 MK II.
NOTE: Lower left corner, some foliage is OOF.
That is cause its closer than others.
I am trying to do comps so that I shoot at the lens sweet spot of f5.6.
Still refining that process.
I have another shot that I will post hat has a more even field of view and sharpness is consistent.
I am a bit conflicted about keeping this lens and its not about the IQ not being satisfactory.
It is sharper than my 24-105 which is a very good copy, recently cal @ Canon
The Rokinon is only a little sharper in the corners/edges.
Maybe a bit stronger in the center.
This is all good, but do I really need this "tool" overlap?
I also have the Rok 35mm, so its not for the f1.4 spec.
I will also note that the focusing is smoother & slower on the Rokinon and this is a good thing. So maybe I'm answering my own questions.
BTW, haven't forgot about testing it wide open.
Just have to find time now that I have over a thousand images from Kauai to go through
Sp12 wrote:
28 and 135 are two "dead for digital" focal lenghts. They used to be in everyone's kit, now we rarely if ever see them.
28 is my "normal lens" for landscapes and 135 is the absolute best single telephoto focal length...if you had to choose just one.
Btw, the ZF 28 is a really good lens.
. But with 3rd party lenses, it is worth it sometimes.
