Samyang/Rokinon 135mm f/2.0 ED Aspherical

D1N0 · 01-12-2015, 08:02 AM

Looks like the entire syopt.com domain is inaccessible. It wasn't yesterday. The lens looks good. If it is around €400 it will probably do well.

**Digitalis** · 01-12-2015, 08:34 AM

if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying.

aurele · 01-12-2015, 08:45 AM

Originally posted by Digitalis

if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying.

You seem to know well the science of optics (i know pretty much the basics, but not much). Would you mind explaining me how you know there is field curvature when seeing the MTF charts ? My wild guess is because line tend to curves in V or A form ?

D1N0 · 01-12-2015, 08:45 AM - **1 Like**

yeah it sucks! Don't buy it.

aurele · 01-12-2015, 08:53 AM

Originally posted by D1N0

yeah it sucks! Don't buy it.

Ah ah ! Knowing myself, i will by this lens in 2 years

D1N0 · 01-12-2015, 08:57 AM

Originally posted by aurele

Ah ah ! Knowing myself, i will by this lens in 2 years

Just shoot monochrome (not the forum member!)

Mistral75 · 01-12-2015, 09:17 AM - **1 Like**

A comparison with the Canon 135mm f/2L, showing the superiority of the Samyang lens over their copy of the Canon lens:

Gear for Image :: Samyang 135mm f2 Review:Samyang 135mm f2 vs Canon EF 135mm 2 L

Twenty-six pictures can be downloaded in original size. They were taken with various cameras: Canon EOS 5D Mk II (24x36; 5,616 x 3,744 pixels), Canon EOS 600D (APS-C; 5,184 x 3,456 pixels), Nikon D810 (24x36; 7,360 x 4,912 pixels) and Nikon D5300 (APS-C; 6,000 x 4,000 pixels).

Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-1
Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-2
Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-3
Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-4
Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-5

D1N0 · 01-12-2015, 09:32 AM

Looking good. Don't need to shoot monochrome after all.

aurele · 01-12-2015, 10:55 AM

Looks very good to me

Sagala · 01-12-2015, 11:04 AM

B&H has the Samyang/Rokinon lens listed on their website for $549 US.

NEW ITEM, AVAILABLE FOR PRE-ORDER.

**jeffshaddix** · 01-12-2015, 11:22 PM

Holy mackerel, looks like I just found my next lens purchase...if they bother with KA mount (I'll believe it when see it).

Actually, it'd be nice to see this up against the K135/2.5 and A135/1.8 to see how the older lenses hold up - though with the trouncing it gave to the canon L, I wouldn't expect much (albeit that was one sample against another, hardly conclusive).

Glad to see lenses like this being made. I imagine being a lens designer for Samyang right now must be pretty rewarding.

Class A · 01-12-2015, 11:57 PM - **1 Like**

Originally posted by Digitalis

if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying.

Yes, the performance of the Samyang is indeed worrisome for

Canon and other manufacturers that do not reach the same level of performance but charge a lot more (AF not being mandatory for everyone), and
anyone who thought they did not need another lens and then this came along. I'm one of them.

P.S.: In case anyone missed it: Mistral75 highlighted K-mount ("Pentax K") support in the list of supported mounts. Big thumbs up for Samyang!

**jeffshaddix** · 01-13-2015, 07:45 AM

Originally posted by Class A

P.S.: In case anyone missed it: Mistral75 highlighted K-mount ("Pentax K") support in the list of supported mounts. Big thumbs up for Samyang!

Yeah, I didn't think they'd manufacture Pentax mount copies for a while, but it looks like the newish 50/1.4 made it to K-mount on B&H, so it may be faster than expected.

P.S. love the bokeh in the review, wide open shows very little edge ringing (which I think means they didn't overcorrect for spherical aberration).

**Digitalis** · 01-13-2015, 08:17 AM

Originally posted by aurele

Would you mind explaining me how you know there is field curvature when seeing the MTF charts ?

look at the shape of the MTF curves at wide open Vs stopped down to f/8 the Sagittal and Meridonial lines should ( with an ideal lens) both be perfectly straight, but here we see that there is a slight shifting in the focal plane caused by field curvature ( The focus field isn't flat, which is bad for macro or close up work). Also the divergence of the Sagittal and Meridonal lines towards the right edge of the MTF chart is strongly indicative of astigmatism.

D1N0 · 01-13-2015, 08:27 AM - **1 Like**

MTF for the Canon 135mm F/2 L

And the Zeiss 135mm F/2 APO Sonnar

The Samyang does not look worse.

01-12-2015, 11:04 AM	#40
Sagala Senior Member Join Date: Sep 2012 Location: Montréal Photos: Gallery Posts: 101 Original Poster	Samyang 135mm B&H has the Samyang/Rokinon lens listed on their website for $549 US. NEW ITEM, AVAILABLE FOR PRE-ORDER. Last edited by Sagala; 01-12-2015 at 11:11 AM.

01-12-2015, 11:57 PM - 1 Like	#42
Class A Pentaxian Join Date: Aug 2008 Location: Wellington, New Zealand Posts: 11,251	Originally posted by Digitalis if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying. Yes, the performance of the Samyang is indeed worrisome for Canon and other manufacturers that do not reach the same level of performance but charge a lot more (AF not being mandatory for everyone), and anyone who thought they did not need another lens and then this came along. I'm one of them. P.S.: In case anyone missed it: Mistral75 highlighted K-mount ("Pentax K") support in the list of supported mounts. Big thumbs up for Samyang! Last edited by Class A; 01-13-2015 at 12:04 AM.

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01-12-2015, 08:02 AM	#31
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Looks like the entire syopt.com domain is inaccessible. It wasn't yesterday. The lens looks good. If it is around €400 it will probably do well.

01-12-2015, 08:34 AM	#32
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying.

01-12-2015, 08:45 AM	#33
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	Originally posted by Digitalis if those MTF charts are accurate this lens will have noticeable LoCa, also the amount of field curvature and astigmatism in the corners at f/8 is worrying. You seem to know well the science of optics (i know pretty much the basics, but not much). Would you mind explaining me how you know there is field curvature when seeing the MTF charts ? My wild guess is because line tend to curves in V or A form ?

01-12-2015, 08:45 AM - 1 Like	#34
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	yeah it sucks! Don't buy it.

01-12-2015, 08:53 AM	#35
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	Originally posted by D1N0 yeah it sucks! Don't buy it. Ah ah ! Knowing myself, i will by this lens in 2 years

01-12-2015, 08:57 AM	#36
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by aurele Ah ah ! Knowing myself, i will by this lens in 2 years Just shoot monochrome (not the forum member!)

01-12-2015, 09:17 AM - 1 Like	#37
Mistral75 Pentaxian Join Date: Feb 2009 Location: Paris, France Posts: 7,527	A comparison with the Canon 135mm f/2L, showing the superiority of the Samyang lens over their copy of the Canon lens: Gear for Image :: Samyang 135mm f2 Review:Samyang 135mm f2 vs Canon EF 135mm 2 L Twenty-six pictures can be downloaded in original size. They were taken with various cameras: Canon EOS 5D Mk II (24x36; 5,616 x 3,744 pixels), Canon EOS 600D (APS-C; 5,184 x 3,456 pixels), Nikon D810 (24x36; 7,360 x 4,912 pixels) and Nikon D5300 (APS-C; 6,000 x 4,000 pixels). Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-1 Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-2 Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-3 Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-4 Gear for Image :: Samyang 135mm f2 Sample Images[Original Size] 5-5

01-12-2015, 09:32 AM	#38
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Looking good. Don't need to shoot monochrome after all.

01-12-2015, 10:55 AM	#39
aurele Veteran Member Join Date: Jan 2011 Location: Paris, France Photos: Albums Posts: 3,217	Looks very good to me

01-12-2015, 11:22 PM	#41
jeffshaddix Site Supporter Join Date: Jun 2010 Location: Colorado Posts: 1,473	Holy mackerel, looks like I just found my next lens purchase...if they bother with KA mount (I'll believe it when see it). Actually, it'd be nice to see this up against the K135/2.5 and A135/1.8 to see how the older lenses hold up - though with the trouncing it gave to the canon L, I wouldn't expect much (albeit that was one sample against another, hardly conclusive). Glad to see lenses like this being made. I imagine being a lens designer for Samyang right now must be pretty rewarding.

01-13-2015, 07:45 AM	#43
jeffshaddix Site Supporter Join Date: Jun 2010 Location: Colorado Posts: 1,473	Originally posted by Class A P.S.: In case anyone missed it: Mistral75 highlighted K-mount ("Pentax K") support in the list of supported mounts. Big thumbs up for Samyang! Yeah, I didn't think they'd manufacture Pentax mount copies for a while, but it looks like the newish 50/1.4 made it to K-mount on B&H, so it may be faster than expected. P.S. love the bokeh in the review, wide open shows very little edge ringing (which I think means they didn't overcorrect for spherical aberration).

01-13-2015, 08:17 AM	#44
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by aurele Would you mind explaining me how you know there is field curvature when seeing the MTF charts ? look at the shape of the MTF curves at wide open Vs stopped down to f/8 the Sagittal and Meridonial lines should ( with an ideal lens) both be perfectly straight, but here we see that there is a slight shifting in the focal plane caused by field curvature ( The focus field isn't flat, which is bad for macro or close up work). Also the divergence of the Sagittal and Meridonal lines towards the right edge of the MTF chart is strongly indicative of astigmatism.

01-13-2015, 08:27 AM - 1 Like	#45
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	MTF for the Canon 135mm F/2 L And the Zeiss 135mm F/2 APO Sonnar The Samyang does not look worse.