Author Topic: Trap Focus with manual focus Samyang 85mm ƒ/1.4  (Read 16328 times)

MKvip

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Trap Focus with manual focus Samyang 85mm ƒ/1.4
« on: March 09, 2014, 04:32:26 PM »
I own a walimex (German distributor) branded Samyang 85mm ƒ/1.4 Aspherical IF UMC

A lot of people complain in frustration about focusing this lens and without any provisions it's really hard to focus @ƒ/1.4 because of the extremely thin DOF it produces. So I did a few things which brought my success rate to around 95% (the remaining 5% are low contrast situations):

- I glued on an EMF chip for camera feedback

- I select the desired focus point manually - I have focus point selection programmed to the thumbwheel on my 60D

- in ML I switched on trap focus on shutter half press

For some strange reason the last one really does the trick - there seems to be a difference between manually pressing the shutter button and having ML do it automatically - I guess it's the time difference from the moment the camera aquires focus. ML trap focus brought my success rate from around 70% (even with focus confirmation!) to 95%!

Examples with very thin DOF:
















here is a flickr set with a lot more pictures - all wide open w/ ML trap focus...


Thanks to the whole ML team for a really great product!

cheers and have a good time, all!




dsManning

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #1 on: March 11, 2014, 12:29:04 PM »
Nice tips.  I have this lens and absolutely love it.  It gives such a nice effect, and holds such nice colours for such a reasonable priced piece of glass.  Quick question for you, does adding the chip have any influence on the camera while manually focusing for video?  For stills/video on this lens, I always use a magnified viewfinder with focus peaking and LV DIGIC peaking to show the edge of what is in focus.  It has done me pretty well so far, but this method looks nice for stills.

A frame pulled from 23.976 RAW video from the 50D on this lens at 1.4  No editing at all yet and I love the look :)


MKvip

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #2 on: March 11, 2014, 09:30:56 PM »
> I have this lens and absolutely love it.  It gives such a nice effect, and holds such nice colours for such a reasonable priced piece of glass.
No question! I even sold my EF 85mm ƒ/1.8  ;)

> does adding the chip have any influence on the camera while manually focusing for video?
Not that I'm aware of - why should it?

> A frame pulled from 23.976 RAW video from the 50D on this lens at 1.4  No editing at all yet and I love the look
absolutely great!

Here are two shots from y'day evening - impossible w/o chip & ML trap focus:





cheers all!

sqd

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #3 on: March 12, 2014, 11:50:40 AM »
This is highly interesting, never tried trap focusing before, and this looks good!

> I have this lens and absolutely love it.  It gives such a nice effect, and holds such nice colours for such a reasonable priced piece of glass.
No question! I even sold my EF 85mm ƒ/1.8  ;)

I have the 85 1.8 too, but you're telling me you sold that in favor of this? Very interesting! Was a 0.4 f-stop worth more than AF? Or what else do you find that makes the Samyang preferable to the Canon?

I'm just curious, that's all :) I mean I could sell my Canon 85 and buy the Samyang, and have more money over :D

MKvip

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #4 on: March 12, 2014, 06:54:25 PM »
I have the 85 1.8 too, but you're telling me you sold that in favor of this? Very interesting! Was a 0.4 f-stop worth more than AF? Or what else do you find that makes the Samyang preferable to the Canon?


Indeed I did, for various reasons:
- I prefer the rendering and bokeh of the Samyang
- I hated the EF's CA (same w/ the 1.2L, btw) - mostly heavy purple fringing which was near impossible to remove in ACR, so mostly I had to do it manually in PS
- actually 1.8 to 1.4 is 2/3 stops
- I don't really need AF - I work w/ lots of
vintage manual lenses anyway...

cheers all!










sqd

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #5 on: March 12, 2014, 10:55:33 PM »


Indeed I did, for various reasons:
- I prefer the rendering and bokeh of the Samyang
- I hated the EF's CA (same w/ the 1.2L, btw) - mostly heavy purple fringing which was near impossible to remove in ACR, so mostly I had to do it manually in PS
- actually 1.8 to 1.4 is 2/3 stops
- I don't really need AF - I work w/ lots of
vintage manual lenses anyway...

cheers all!


Yes, very true about the CA, luckily I've been able to fix those issues in my shots so far, but one day.. you never know! And looking at sample images, the bokeh is very nice on the Samyang. Thanks for the info!

Might pick one up and sell either one when I've decided which one I like the most :)

MKvip

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #6 on: March 12, 2014, 11:37:47 PM »
Yes, very true about the CA, luckily I've been able to fix those issues in my shots so far, but one day.. you never know!
Automatic fixing in ACR just didn't work for me - a lot of manual labor in PS was the result.

To show how easy it is w/ the Samyang I did a quick comparison here - done in seconds automatically in ACR w/ my default Samyang 85mm profile. Note especially the mannequin's heads and the neon signs (click pict for hires):





And looking at sample images, the bokeh is very nice on the Samyang.
The bokeh this lens produces is just a dream


Thanks for the info. Might pick one up and sell either one when I've decided which one I like the most :)
Good idea :-) Sometimes you can get them brand new and very cheap on eBay from people who can't handle the manual focusing - that's how I got mine *g*

cheers all!

eos450d

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #7 on: December 31, 2014, 01:05:49 PM »
does Trap focus only works in live view?

graphitivity

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #8 on: January 18, 2015, 05:16:38 PM »
Amazing!

DeafEyeJedi

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Re: Trap Focus with manual focus Samyang 85mm ƒ/1.4
« Reply #9 on: January 18, 2015, 07:49:49 PM »
Purely Brilliant!

Thanks for sharing, Mike!
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