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Thread started 05 Mar 2014 (Wednesday) 06:08
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Is this normal for a Samyang 14mm?

 
Omri ­ Alon
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Mar 05, 2014 06:08 |  #1

I got myself a Samyang 14mm mostly for star photography. I have the 17-40L for daytime landscapes.

The reason I got it is that by most reviews it is very sharp at f/2.8. That is exactly what I needed for my star-scapes.

I try not to pixel peep, but when I get a new lens, I do test it. The results of these basic tests are that it is not as sharp as the reviews say. It makes me wonder if I got a bad(ish) copy.
At 2.8, the pictures look a little bit hazy and not sharp. It is not very bad but it's not great. It does improve when it's stopped down. I expected better results.

The sharpness is uniform across the frame, so don't think there is a decentering problem.

A comparison: Center crops, 17-40 at f/4 on the left, Samyang 14 at f/2.8 on the right. What do you think?

IMAGE: http://farm3.staticflickr.com/2870/12947130863_cc2e4933e6_o.jpg
These are straight from RAW with lightroom's default sharpening of 25.

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Invertalon
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Mar 05, 2014 06:26 |  #2

I have used/tried a few of these, and there is copy variation (like any lens). I have had ones that were pretty soft wide open, others very sharp. If you get a well centered copy though, that is the important part! :D

Your copy does look a bit on the softer side, though.


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Reiep
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Mar 05, 2014 06:54 |  #3

Mine is pretty sharp at 2.8, way more than the sample you posted.

The only example I have is that :

IMAGE: http://c4.staticflickr.com/4/3776/11203879895_c1c87e9645_z.jpg
IMAGE LINK: http://www.flickr.com/​photos/reiep19/1120387​9895/  (external link)
Not so fast, not really furious (external link) by Reiep19 (external link), on Flickr

It just got cropped a little in order to get rod of an interesting part and resized, no sharpening whatsoever. The original file is sharper, resizing + flickr didn't help.

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single_track
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Mar 05, 2014 07:04 as a reply to  @ Reiep's post |  #4

My 17-40 is pretty darn sharp: good colors and contrasty. Especially in the center. It is a great lens. Stopped down, it is my sharpest lens, beating the 24-70, and even the sigma 50mm 1.4.

I cannot say if your 14mm is soft but you may be comparing it against a great lens.


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Mar 05, 2014 07:28 |  #5

Omri Alon wrote in post #16735700 (external link)
A comparison: Center crops, 17-40 at f/4 on the left, Samyang 14 at f/2.8 on the right. What do you think?
QUOTED IMAGE
These are straight from RAW with lightroom's default sharpening of 25.

Looks like you are wide open and missed focus. The yellow pole seems to be sharper than the vehicle and especially the trees in the background.


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Mar 05, 2014 07:41 |  #6

The focus scales on them are usually off so make sure you focussed correctly when testing. I find my copy to be not great at f/2.8 but very sharp from f/4 onwards


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titi_67207
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Mar 05, 2014 08:01 |  #7

Maybe your copy focuses not enough far. Try to turn the ring to the maximum distance, and check the image at f/2.8, are far objects enough sharp or not ?

PS: My Samyang 14mm is sharper at f/2.8 than my 17-40MM at f/4. After f/5.6, they are very sharp without sharpness differences (except corners where the 14mm is better)


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Omri ­ Alon
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Mar 05, 2014 08:28 |  #8

Invertalon wrote in post #16735719 (external link)
I have used/tried a few of these, and there is copy variation (like any lens). I have had ones that were pretty soft wide open, others very sharp. If you get a well centered copy though, that is the important part! :D

Your copy does look a bit on the softer side, though.

Thank you. I agree that being centered is more important than slight softness wide open.

Reiep wrote in post #16735749 (external link)
Mine is pretty sharp at 2.8, way more than the sample you posted.

The only example I have is that :
QUOTED IMAGE
IMAGE LINK: http://www.flickr.com/​photos/reiep19/1120387​9895/  (external link)
Not so fast, not really furious (external link) by Reiep19 (external link), on Flickr

It just got cropped a little in order to get rod of an interesting part and resized, no sharpening whatsoever. The original file is sharper, resizing + flickr didn't help.

Thank you. Your picture does look good.

single_track wrote in post #16735762 (external link)
My 17-40 is pretty darn sharp: good colors and contrasty. Especially in the center. It is a great lens. Stopped down, it is my sharpest lens, beating the 24-70, and even the sigma 50mm 1.4.

I cannot say if your 14mm is soft but you may be comparing it against a great lens.

Could be. I do like the 17-40L.

Talley wrote in post #16735803 (external link)
Looks like you are wide open and missed focus. The yellow pole seems to be sharper than the vehicle and especially the trees in the background.

I believe the focus is good. If you want, I can upload the full image. I have gotten similar results several times.

xpfloyd wrote in post #16735813 (external link)
The focus scales on them are usually off so make sure you focussed correctly when testing. I find my copy to be not great at f/2.8 but very sharp from f/4 onwards

Thank you. I didn't use the focus scale. I focused using live view.
I have also noticed that the focus is different at the same point on the focus scale when I'm coming from infinity or the MFD.

titi_67207 wrote in post #16735846 (external link)
Maybe your copy focuses not enough far. Try to turn the ring to the maximum distance, and check the image at f/2.8, are far objects enough sharp or not ?

PS: My Samyang 14mm is sharper at f/2.8 than my 17-40MM at f/4. After f/5.6, they are very sharp without sharpness differences (except corners where the 14mm is better)

Thank you. My copy does focus past infinity, so I don't think that that is the problem.


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titi_67207
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Mar 05, 2014 08:54 |  #9

Well, you seem to have a bad copy. Return/exchange it if you can!

Titi


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Omri ­ Alon
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Mar 05, 2014 10:18 |  #10

titi_67207 wrote in post #16735957 (external link)
Well, you seem to have a bad copy. Return/exchange it if you can!

Titi

That's what I thought. Thank you.


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Is this normal for a Samyang 14mm?
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