20/21mm on FF..........yet again!
/forum/topic/1133625/0

1
       2       3              5       6       end

timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

Using on Canon MkII, I've found that my recently bought, little used Zuiko 21mm F2 has vignetting which never completely goes away with stopping down (no filters on!), although it reduces in size it gets sharper and more noticeable!

Here at F11



What are the recommended Alternatives? (I don't use this FL enough to warrant the expense or size of the Zeiss 21/2.8)

I have tried the Voigtlander 20mm F3.5, which has smoother vignette but the IQ is not good.

Nikkor 20/2.8 AiS, or something else?



Dergiman
Registered: Mar 12, 2005
Total Posts: 812
Country: Austria

Canon 17-40L is quite good in the 20-40mm range.



darrellc
Registered: Jan 02, 2005
Total Posts: 440
Country: N/A

Oly 21/3.5?



Gunzorro
Registered: Aug 28, 2010
Total Posts: 6413
Country: United States

Dergiman wrote:
Canon 17-40L is quite good in the 20-40mm range.


I don't know about that -- the 17-40 has quite a bit of vignetting and light fall-off, even when closed down.

I would consider the EF 20/2.8 for a relatively low cost "alternative".

Wider, the Samyang 14mm f/2.8 is quite fantastic and low cost, but very much UWA.




FlyPenFly
Registered: Feb 14, 2011
Total Posts: 6389
Country: United States

Try going outside and taking a real picture.



joxang
Registered: May 08, 2012
Total Posts: 121
Country: United Kingdom

That much vignetting is barely noticeable and isn't really a problem is it? Especially if you shoot RAW. My Oly 28/2 vignettes much more than that at f8 and it takes a 1sec slider adjust to sort it out with no change in picture quality.



timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

FlyPenFly wrote:
Try going outside and taking a real picture.

The only reason I'm posting this is because this is what it does whatever I take! (This is just a plain blue sky shot on mono!)
It is very noticeable and Canon DPP doesn't do vignette adjust for non native lenses.
Concerning the 17-40L, yes it is better I've tested it but was hoping for something smaller.
How good/bad is the Nikkor 20/2.8 AiS cf. the Voigt?



timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

Real life: (F8)



joxang
Registered: May 08, 2012
Total Posts: 121
Country: United Kingdom

^May be wrong, but that kind of irregular vignetting I only see if I'm stacking filters, or if my mount is a bit loose.



timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

No filters, very solid mount.



FlyPenFly
Registered: Feb 14, 2011
Total Posts: 6389
Country: United States

How far from the infinity stop is actual infinity? Maybe the adapter is too thick?



RustyBug
Registered: Feb 02, 2009
Total Posts: 12576
Country: United States

I'm guessing this is inherent to the lens. I don't have the 21/2, but I do have the 18/3.5 and it retains a vignette at all apertures as well.

The Oly's (imo) trade the excellent distortion for the vignetting ... just the nature of optics / physics of light, those who design less vignetting, will necessitate more distortion (or weaker corners) ... the wider you go, the tougher it gets ... choose your poison.

I've got both the Oly 21.3.5 and the Nikon 20/2.8 AIS, but neither are available for me to use atm ... but from memory both have more reasonable vignetting than your 20/2 is showing @ f11.

I haven't gotten around to it yet, but I figure I should make a vignetting action specific to each stop @ my Oly 18/3.5

f8, f11 & f16 from a test set some time back.



Mescalamba
Registered: Jul 06, 2011
Total Posts: 2978
Country: Czech Republic

Ehm.. vignetting fix doesnt work? It wont go away completely but it can be reduced to minimum.

In real life, bit of vignetting is last thing that bothers me.. CA/LoCA/PF are much worse, or some complex distortion..



RustyBug
Registered: Feb 02, 2009
Total Posts: 12576
Country: United States

Here's some from the Nikon 20/2.8 AIS ... I'm thinking these are f16, f11 & f8 ... but I didn't name the files right back then, so it's only a guess as these seem to be the least (sequential) vignette shots from the series.



timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

FlyPenFly wrote:
How far from the infinity stop is actual infinity? Maybe the adapter is too thick?


Infinity is spot on.

I think Kent has it, which is why I askedfor alternatives!
Thanks for those of the Nikon 20mm F2.8 AiS Kent, they look very similar to my Zuiko, if not moreso, looks like it's a problem of this FL, I think I'll pass on the Nikkor too!.



RustyBug
Registered: Feb 02, 2009
Total Posts: 12576
Country: United States

Vignetting, distortion, resolution ... you can have any two, but not all three when it comes to WA/UWA. How much you are willing to trade of each is pretty subjective, with a lot of people opting to go with a mustache distortion like the Zeiss or Tamron's do.

The one thing I found @ my Nikon vs. Oly 21/3.5 (not shown here) was that the Oly had more even sharpness across the board and the Nikon a bit more centrally sharper/ softer corners.



timballic
Registered: May 21, 2011
Total Posts: 741
Country: United Kingdom

Thanks Kent, that's been very helpful. I suspect I'm not going to find my ideal 20mm after all!

BTW what size are you uploading those of the truck, they look so much crisper than mine of the church (1/2 original size, through photobucket)



RustyBug
Registered: Feb 02, 2009
Total Posts: 12576
Country: United States

Generally speaking ... the Zeiss is considered "The King" and the Oly 21/3.5 is good alternate choice for the $$$ diff. The Zeiss has mustache distortion and is a beast, but retains it status even so. I like the Oly for it's even sharpness into the corners and its $$$ / size diff, as well as the slightly lower contrast (than the Nikon 20/2.8 AIS) can be useful in high DR scenes.

Those were raw-jpgs that had been processed & down sized via PS way back when.

BTW ... if you are looking to avaoid vignetting in the WA/UWA camp ... the newer Tilt-Shift lenses have larger image circles that pretty much obliterates vignetting, have superb distortion control and excellent resolution and smooth tonal transition ... albeit a touch less contrasty (easy to bump in post) as the projection does spread out it little bit more.

Size, weight & $$$ all go up accordingly, but for WA/UWA ... my 24L TS-E II is virtually flawless @ distort/vignette/resolution. I can only image the new 17L TS-E is likewise benefitted by the larger image circle.



carstenw
Registered: Dec 26, 2005
Total Posts: 15144
Country: Germany

If the size isn't a problem, I would really recommend saving up for the Zeiss. It is just a brilliant lens, and you can probably save a bit of money by getting the ZF (1) version. What will the Olympus 21/2 get you?



ManWearPants
Registered: Oct 13, 2009
Total Posts: 757
Country: Qatar

How about replacing DPP with another software that can cure vignetting. Otherwise, will performing a small crop solve the problem? Just frame larger than necessary, keeping the need to crop in mind.



1
       2       3              5       6       end