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SP/XP 14mm /2.4 Rokinon testing and images
  
 
Bespoked
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p.3 #1 · p.3 #1 · SP/XP 14mm /2.4 Rokinon testing and images


rji2goleez wrote:
I've seen some barrel distortion when shooting straight onto a wall or similar subject. Of course there is no profile on this lens in LRCC just yet. Let me see if I still have that image.



Appreciate it, thanks
I use the Distagon 15 to create architectural images without distortion and whilst I love the Zeiss, it's horribly expensive, large and heavy and it could be sold to purchase a Samyang 2.4/14 XP (or SP) with change for possibly greater image quality.

Distortion and CA (at f5.6-11) are important to people like myself.



Mar 12, 2017 at 05:29 AM
mcbroomf
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p.3 #2 · p.3 #2 · SP/XP 14mm /2.4 Rokinon testing and images


I took some more star photos this am. The files below are in the gallery
http://www.pbase.com/mike_broomfield/14mm_sp_rokinon_lens_tests

Crops from; center, top left, top right and bottom right (re-oriented to vertical so the crop comes from the top right again). Each image was taken; WO, F2.8 and F4.0 (crops are in that order). Tripod, IBIS off, 640 ISO, 10 secs, 2 sec timer (could not get my remote working and too cold to fiddle around)

I reset LR to it's defaults (so no high levels of capture sharpening or CA correction) but then adjusted highlights, white, shadows blacks and noise reduction to show the stars clearly as possible given that it was a full moon.

Center





Top left





Top right





Bottom right








Mar 13, 2017 at 12:24 PM
mcbroomf
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p.3 #3 · p.3 #3 · SP/XP 14mm /2.4 Rokinon testing and images


I've ordered some SS foil which will be here tomorrow and plan to shim one of my Metabones adapters. I'll take a before and after to show the smearing. I'm hoping to get it spot on for infinity to compare to the Sigma which is very close.

I think this lens is a keeper although I'd like to retest everything (diagonal infinity and stars as I was working quickly and think I may have focused a bit too far). I can see a slight amount of coma, but it's no worse that the very slight star motion also visible for a 10 sec exposure so I don't think I'm worried about it, even on a decent sized print (I typically evaluate at ~50% for a large print)



Mar 13, 2017 at 12:34 PM
rji2goleez
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p.3 #4 · p.3 #4 · SP/XP 14mm /2.4 Rokinon testing and images


This is looking good! My sigma MC-11 seems to be spot on and focuses just past infinity which is my preference. However it's been too cold, snowy and cloudy here in MN to do much testing.


Mar 13, 2017 at 01:11 PM
Schlotkins
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p.3 #5 · p.3 #5 · SP/XP 14mm /2.4 Rokinon testing and images


Looks great! I may have to try one. Does it seem like it's faster (i.e. more light) than the old 2.8 version?


Mar 13, 2017 at 02:06 PM
mcbroomf
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p.3 #6 · p.3 #6 · SP/XP 14mm /2.4 Rokinon testing and images


Schlotkins wrote:
Looks great! I may have to try one. Does it seem like it's faster (i.e. more light) than the old 2.8 version?


I can't really tell yet, not enough shots in the same conditions. I typically only used the old MF version for stars. Once I've done more I'll be able to compare files.



Mar 13, 2017 at 04:42 PM
mcbroomf
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p.3 #7 · p.3 #7 · SP/XP 14mm /2.4 Rokinon testing and images


The SS foil I ordered was delivered and I made up some shims to go in one of my MB IV adapters which was too thin. I was lucky and with a single shim got it to pretty much the same as the MC-11 adapter, ie got infinity focus just before the hard stop. The result seems to bring the adapter up to the same quality as the Sigma adapter which is good news.

I think the lens is a keeper. Not sure what the Sigma will bring to the table but I'm very happy with the tests from this lens so I'll likely skip it ... unless

Some additional tests. I forgot to put on the unshimmed adapter to show the difference, but this was with the new and improved MB IV

Top left and right only, WO, 13 secs, 1600 ISO





Top left-center-bottom right, hand held





Bottom left-center-top right








Mar 17, 2017 at 05:51 PM
rji2goleez
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p.3 #8 · p.3 #8 · SP/XP 14mm /2.4 Rokinon testing and images


Nice! I tend to agree this is a keeper but I wish the weather would cooperate so I could contribute to these tests! Hopefully this weekend . . .


Mar 17, 2017 at 05:58 PM
mcbroomf
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p.3 #9 · p.3 #9 · SP/XP 14mm /2.4 Rokinon testing and images


Fingers crossed for you. We're expecting another 5-8" of snow ...


Mar 17, 2017 at 06:02 PM
freaklikeme
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p.3 #10 · p.3 #10 · SP/XP 14mm /2.4 Rokinon testing and images


Nice work, gentlemen. Thanks for sharing and it looks like you've both got good copies.


Mar 18, 2017 at 02:09 AM
 

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Chris_88
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p.3 #11 · p.3 #11 · SP/XP 14mm /2.4 Rokinon testing and images


Thanks for tests, gentlemen. It's probably too early to comment on QC, but otherwise how does the XP compare to the old 14 2.8? Vignetting looks slightly better may be?


Mar 18, 2017 at 01:34 PM
rji2goleez
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p.3 #12 · p.3 #12 · SP/XP 14mm /2.4 Rokinon testing and images


Finally some decent weather. All are at f/5.6 except the first which is wide open. Close focusing is nice. Colors and sharpness are nice. A bit of flare shooting into the sun is not. Hopefully it stay clear and I can shoot some stars tonight.






















Mar 18, 2017 at 10:42 PM
Lamda
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p.3 #13 · p.3 #13 · SP/XP 14mm /2.4 Rokinon testing and images




mcbroomf wrote:
The SS foil I ordered was delivered and I made up some shims to go in one of my MB IV adapters which was too thin. I was lucky and with a single shim got it to pretty much the same as the MC-11 adapter, ie got infinity focus just before the hard stop. The result seems to bring the adapter up to the same quality as the Sigma adapter which is good news.

Hi

Would you mind posting pics of your shims? I'm haveong the same issue with my Fotodiox Pro adapter and I'm not liking the corners at all! They do look consistent so I don't think it's decentering. Hoping to get it working right. The center is really quite sharp!

Thanks!



Mar 19, 2017 at 03:53 AM
Lamda
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p.3 #14 · p.3 #14 · SP/XP 14mm /2.4 Rokinon testing and images




rji2goleez wrote:
I have one coming tomorrow as well but I need to find an adapter. I think my local camera store has the MC-11 in stock so I may pick up one of these.


Did you end up using the MC11 or another adapter?



Mar 19, 2017 at 03:55 AM
mcbroomf
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p.3 #15 · p.3 #15 · SP/XP 14mm /2.4 Rokinon testing and images


Lamda wrote:
Hi

Would you mind posting pics of your shims? I'm haveong the same issue with my Fotodiox Pro adapter and I'm not liking the corners at all! They do look consistent so I don't think it's decentering. Hoping to get it working right. The center is really quite sharp!

Thanks!

I have 1 more adapter to make shims for so I'll post a pic when I do that one, but essentially it will look like this, except that I found I had to make the shims narrower otherwise they fouled the lens flange when it was being mounted (I could not mount the lens the 1st time). I'm using a thicker, stiffer shim material and only needed 1 layer and I think that was part of the problem.
http://www.fredmiranda.com/forum/topic/1415739/2#13444891



Mar 19, 2017 at 07:56 AM
rji2goleez
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p.3 #16 · p.3 #16 · SP/XP 14mm /2.4 Rokinon testing and images


Lamda wrote:

Did you end up using the MC11 or another adapter?


I have the MC-11. No shimming required.



Mar 19, 2017 at 11:36 AM
Chris_88
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p.3 #17 · p.3 #17 · SP/XP 14mm /2.4 Rokinon testing and images


Sorry to bug people again, but how would rate fall off/vignetting wide open? Bob's first shot above shows some, but to my eyes it doesn't look too bad. The old Samyang 14 2.8 and the Zeiss 15 2.8 are pretty bad in that regard, with the latter supposedly having more than 4 EVF worth at f2.8, which sucks for astro.


Mar 22, 2017 at 01:34 PM
rji2goleez
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p.3 #18 · p.3 #18 · SP/XP 14mm /2.4 Rokinon testing and images


In my limited shooting with the lens, I believe it to be much better than the old Samyang. While there might be some variability depending on shooting conditions, I believe what we see in my WO shot above to be typically what we will see with the new lens. I will say that I need more time with the lens myself. Work and weather have prevented me from spending the quality time I need . . .


Mar 22, 2017 at 02:05 PM
Chris_88
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p.3 #19 · p.3 #19 · SP/XP 14mm /2.4 Rokinon testing and images



rji2goleez wrote:
In my limited shooting with the lens, I believe it to be much better than the old Samyang. While there might be some variability depending on shooting conditions, I believe what we see in my WO shot above to be typically what we will see with the new lens. I will say that I need more time with the lens myself. Work and weather have prevented me from spending the quality time I need . . .


Thanks, Bob. That sounds encouraging.



Mar 22, 2017 at 02:15 PM
mcbroomf
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p.3 #20 · p.3 #20 · SP/XP 14mm /2.4 Rokinon testing and images


I'll try to get a few WO shots done later this week. I don't think I have any from my old Rokinon though as I only used that for astro


Mar 22, 2017 at 03:32 PM
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