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Archive 2017 · SP/XP 14mm /2.4 Rokinon testing and images

  
 
rji2goleez
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p.2 #1 · p.2 #1 · SP/XP 14mm /2.4 Rokinon testing and images


No time for any real testing as I was losing light on an overcast day. Nonetheless, this lens does show some promise. Rokinon 14/2.4 @ 2.4. 1:1 crop of the upper left corner included.. I notice that this lens is very easy to over sharpen too.












Mar 09, 2017 at 08:06 PM
mcbroomf
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p.2 #2 · p.2 #2 · SP/XP 14mm /2.4 Rokinon testing and images


AGeoJO wrote:
Mike, thank you for evaluating the lens. It seems to be a more than decent performer with respect to coma to me. As such, the lens appears to be a contender for an excellent astro lens . Do you think the other corners perform similarly to the top left corner that you looked at though? Thanks again!


Joshua, I didn't have a chance to take a full set, just one with good center focus and stars up in the left corner. I'll find a darker time and do a full set on Sunday if I can brave the cold.



Mar 09, 2017 at 08:44 PM
snapsy
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p.2 #3 · p.2 #3 · SP/XP 14mm /2.4 Rokinon testing and images


mcbroomf wrote:
My lens arrived by Fedex at midday (UPS are usually late in the day) so I was able to do some preliminary tests. As a simple 1st check I slapped an adapter on it, focused in the center on the roof and trees of my back neighbour at high mag, then moved the focus point to one of the corners. The corner was terrible! I checked another corner and got the same thing. I had put on an MB IV adapter and it was focusing on infinity well before the stop, so I switched over to an MC-11 which only
...Show more

Thanks for the tests. Here's a very good copy of the MF version for comparison.

Samyang 14mm @ f/8 on 5DSR, full-sized 50MP image



Mar 09, 2017 at 09:52 PM
tylerdurden801
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p.2 #4 · p.2 #4 · SP/XP 14mm /2.4 Rokinon testing and images


Wow, that corner performance looks really good!


Mar 10, 2017 at 10:06 AM
rji2goleez
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p.2 #5 · p.2 #5 · SP/XP 14mm /2.4 Rokinon testing and images


Nothing special here but some shots all at f/11. The lens is certainly sharp. I would say that this lens sunstar performance is rather weak. Nothing like the Voigtlander Helliar 15/4.5 III.

















Mar 10, 2017 at 01:53 PM
AGeoJO
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p.2 #6 · p.2 #6 · SP/XP 14mm /2.4 Rokinon testing and images


rji2goleez wrote:
Nothing special here but some shots all at f/11. The lens is certainly sharp. I would say that this lens sunstar performance is rather weak. Nothing like the Voigtlander Helliar 15/4.5 III.


The lens looks promising, Bob. Thanks for your evaluation. The light source (sun) of the sunstar in your image is too big probably. If you try a street lantern or similar at night the rendition of the sunstar should be better than that.



Mar 10, 2017 at 01:59 PM
mcbroomf
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p.2 #7 · p.2 #7 · SP/XP 14mm /2.4 Rokinon testing and images


Yes, I got a similar result with the sun yesterday at F13 (3 examples in the gallery). Pretty noticeable flare too ..
http://m2.i.pbase.com/g10/63/551663/2/165097542.YMRB9MbW.jpg



Mar 10, 2017 at 02:16 PM
rji2goleez
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p.2 #8 · p.2 #8 · SP/XP 14mm /2.4 Rokinon testing and images


AGeoJO wrote:
The lens looks promising, Bob. Thanks for your evaluation. The light source (sun) of the sunstar in your image is too big probably. If you try a street lantern or similar at night the rendition of the sunstar should be better than that.


I did a quick try last night on my garage door lights and it wasn't good but I don't consider that a good test just yet. Stay tuned . . .



Mar 10, 2017 at 02:23 PM
Dustin Gent
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p.2 #9 · p.2 #9 · SP/XP 14mm /2.4 Rokinon testing and images


i had the samyang 14mm 2,8 for several years, and it was tack sharp - but the sunstar was not that great. This one seems a bit better. wonder what it would look like at f/22?


Mar 10, 2017 at 09:28 PM
rji2goleez
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p.2 #10 · p.2 #10 · SP/XP 14mm /2.4 Rokinon testing and images


One more quick corner test. This looks pretty good . . . I would say even awesome. Shot wide open. I wish it weren't so cloudy as I am really curious about astro now.










Bottom Right corner 1:1 crop







Top Left Corner




Mar 10, 2017 at 10:26 PM
rji2goleez
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p.2 #11 · p.2 #11 · SP/XP 14mm /2.4 Rokinon testing and images


And by the way . . . have I mentioned how sharp this lens is?







Mar 10, 2017 at 10:40 PM
rji2goleez
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p.2 #12 · p.2 #12 · SP/XP 14mm /2.4 Rokinon testing and images


Bespoked wrote:
In that last shot, what are those three thick expanding lines in the sky?
Looks like flare added in post, but I'm guessing it isn't?

I'm very interested in how this lens does for architecture on the 7R2.


They're reflections from shooting through the office window.



Mar 10, 2017 at 11:08 PM
GMPhotography
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p.2 #13 · p.2 #13 · SP/XP 14mm /2.4 Rokinon testing and images


Corners do look very nice.


Mar 10, 2017 at 11:56 PM
arduluth
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p.2 #14 · p.2 #14 · SP/XP 14mm /2.4 Rokinon testing and images


rji2goleez wrote:
One more quick corner test. This looks pretty good . . . I would say even awesome. Shot wide open. I wish it weren't so cloudy as I am really curious about astro now.


I don't know about any one else, but IMHO that's pretty incredible for wide open, especially for an extreme wide angle like this.



Mar 11, 2017 at 12:18 AM
hiepphotog
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p.2 #15 · p.2 #15 · SP/XP 14mm /2.4 Rokinon testing and images


Interesting. No one noticed the slight color cast in the corners, even on the A7RII. Looking good though....


Mar 11, 2017 at 01:00 AM
rji2goleez
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p.2 #16 · p.2 #16 · SP/XP 14mm /2.4 Rokinon testing and images


Bespoked wrote:
Makes sense! I thought it was strange, I thought to myself, why would he add ugly flares in post? lol

Thanks for the samples, I really appreciate it. I've been seeing them come in for a few months and none of them are what I want to see, but we're getting closer.
If you can, I'd love to see architecture to assess distortion characteristics which from your samples looks very well controlled!


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.



Mar 11, 2017 at 07:02 AM
tylerdurden801
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p.2 #17 · p.2 #17 · SP/XP 14mm /2.4 Rokinon testing and images


Looks like I have to rent this lens. For when the 16-35 "good enough" doesn't cut it, this and the L21 might do . . .


Mar 11, 2017 at 10:56 AM
Schlotkins
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p.2 #18 · p.2 #18 · SP/XP 14mm /2.4 Rokinon testing and images


Any idea what the t-stop is? Could take a pic with a lens with a known t stop and then compare exposure. I'm curious how close to a 2.4 lens it is.

Thanks
Chris



Mar 11, 2017 at 02:28 PM
mcbroomf
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p.2 #19 · p.2 #19 · 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
http://m6.i.pbase.com/o10/63/551663/1/165118466.WzFPjsj3.SPcenter.jpg
Top left
http://m7.i.pbase.com/o10/63/551663/1/165118467.QQhjt0bM.SPtopleft.jpg
Top right
http://m8.i.pbase.com/o10/63/551663/1/165118468.nwEip30z.SPtopright.jpg
Bottom right
http://m9.i.pbase.com/o10/63/551663/1/165118469.mvpdkXEz.SPbotright.jpg



Mar 13, 2017 at 07:24 AM
mcbroomf
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p.2 #20 · p.2 #20 · 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 07:34 AM
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