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New lens arived! cheap korean bargen!
show user profile  Bobbyboy
Hey guys! I mentioned the other week that I had ordered a new lens from ebay after having read about it on dpreview. The lens is a samyang 85mm f1.4 re branded as opteka. This is a manual focus lens and can be had in just about any mount. unfortunately that doesn't include 4/3's so I bought the nikon version and ordered an adapter as well.

According to most on dpreview this lens comes close in optical quality to the nikon 85mm f1.4 and some say it is even better. I payed $310 US about $400 au with postage! the nikon is almost $1500!

The adapter that I ordered hasn't arrived yet but I have been playing with it just holding it up to my camera and focusing by moving it further away and closer to the camera. from what i've seen so far it is awesome! really sharp when I can actually get it to focus which is almost never, come on, you try and focus a lens at f1.4 with this method =P
and the bokeh is so smooth!

Build quality seems pretty solid too, but the lens cap and hood are kind of cheap.
Check it out for yourself on dpreview, really cool cheap alternative to other longer fast primes :)
this was shot using the 85 at f1.4 hand focused (was kind of oof but downsized doesn't show up too bad), look at the bokeh :)

an edited version of the above picture

read 578 times
8/20/2009 11:03:21 PM (last edit: 8/21/2009 10:46:19 AM)
show user profile  Error404
84 1.4, a nice aperture for that focal length :-) -

read 565 times
8/20/2009 11:06:49 PM (last edit: 8/20/2009 11:06:49 PM)
show user profile  Bobbyboy
well it would be great for portraits if i was using it on a full frame but concider this is on a 2x crop so 170mm is a bit on the long side, i still like it though and how often do you see a 170mm f1.4 =P

read 557 times
8/20/2009 11:24:25 PM (last edit: 8/20/2009 11:24:25 PM)
show user profile  Error404
no, it's still an 85 1.4, you're just seeing the center of the lens :) -

read 548 times
8/20/2009 11:37:33 PM (last edit: 8/20/2009 11:37:33 PM)
show user profile  gogodr
I dont really know much of lens.....
is it truth that when its about lens the bigger the better?

Hello there

beautiful ;3

read 545 times
8/20/2009 11:48:22 PM (last edit: 8/20/2009 11:48:22 PM)
show user profile  Dub.

read 537 times
8/21/2009 12:18:34 AM (last edit: 8/21/2009 12:18:34 AM)
show user profile  LoyHogg
Whats that? A 1600mm mirror :)
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8/21/2009 4:47:06 AM (last edit: 8/21/2009 4:47:06 AM)
show user profile  Bobbyboy
lol! @ dub

@error, yes, you are right. no different really to cropping down a 20mp ff image with the same lens to half

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8/21/2009 8:33:01 AM (last edit: 8/21/2009 8:33:01 AM)
show user profile  Error404
on my 8x10, I have a 159mm lens which is classified as an "extreme wide angle" for the 8x10 camera. But the lens is still 159mm, I'm just seeing a lot more of the lens, and the lens is designed to cover a much larger area than a 159mm lens meant for an SLR camera. The focal length of a lens is just how far away it needs to be to come into focus :-) (though this is a little more complicated on some newer lens designs, but basically the same) -

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8/21/2009 10:44:07 AM (last edit: 8/21/2009 10:44:17 AM)
show user profile  Bobbyboy
I guess it would be simpler to talk in terms of fov instead of focal length. at the end of the day, all my oly lenses are actually made for a ff system as they are designed with an image circle matching that of the sensor.

But what I would like to know is if I take an image with a 85mm lens and one with a 170mm lens would they have a different sense of perspective from one another?

as in how a wide angle will distort and exagerate perspective or how a longer lens compresses it.

if you are taking an image with an 85mm and only using half the image circle giving an equivalent fov of a 170mm focal length lens, will that image still have the same characteristics of the 85mm when it comes to how it distorts perspective?

Thanks in advance for any insight error or anyone else for that matter :)

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8/22/2009 12:30:37 AM (last edit: 8/22/2009 12:30:37 AM)
show user profile  Error404
perspective is not determined by the lens focal length. It's determined by your position relative to your subject, how far away from the object you are. As you get physically farther away, you get more "compression" on the subject that you are looking at. And then when you use a long lens and 'zoom in' to your subject, you can now clearly see that compression. But if you took a shot shot with a wide angle lens from the same exact point as you did with the longer lens and then cropped in to your subject, you would still have the same amount of visual compression on your subject :-) But because you had to pull out a long lens to see your subject, it's natural to assume that the longer focal length lens is what's causing the visual compression. (and just the opposite when you are close to a subject, and need a wide lens to see the entire subject)

It's kind of complicated to think about, but it's really kind of simple. Like if you hold a ball up to your face, the ball blocks almost the entire room. But if you hold the ball out at arms length, now you are only covering up a small portion of the room. That's visual compression, the easiest way I can think to explain it, that's perspective, how large closer objects appear relative to objects farther away.

The notion of focal length and zoom is what throws people off, all focal length and zooming does, is look closer at your subject, it doesn't change the perspective of your subject. Now, distortion of the image like from a real wide lens, that's different, that's not perspective, that's just distortion.

I didn't really get a real good grasp on all of this until I started working with a large format view camera. The cameras are broken down to their simplest parts, and it makes things easier to understand. You can clearly see that focal length is just how far away the lens focuses at (and so on), and it slows you down enough to notice things like visual compression and how distance to your subject is what makes the most difference in just about everything. I'm sure there's parts that I'm not entirely correct on, but for the most part, I've learned alot from slowing down and using the large format cameras.

As for using the 85mm on a smaller chip camera, and "seeing" what a 170mm lens would see on a full chip camera, with your camera with 85mm lens you will need to stand the same distance away as the guy with the full chip camera and the 170mm lens to get the same framing of your subject. So, you will have the same visual compression as the 170mm lens, but only IF you are standing the same amount away as the guy with the 170mm lens :-) You are just forced to stand farther away with the shorter lens, because you are seeing only the center portion of the lens, and thus need to stand farther away to capture the entire scene. If you were both using 85mm lenses, you would not be able to get the same photograph, as you would always need to be standing farther away to capture the same amount of subject area as the guy with the larger chip camera.

You don't really need to understand any of that though, just go and shoot. I just like stuff like that, optics and cameras and things fascinate me :-) Here's a tip when shooting portraits with a fast aperture lens, traditionally, it usually "feels" better when you focus on the eye that is closest to the camera. For some reason, that makes the image feel more "right" than if the farther away eye is in focus and the closer eye is out of focus. You'll probably find out pretty soon that a fast aperture lens can be tricky to focus exactly where you want it, the slightest movement from either you or your subject, and your focus has shifted a bit, haha! :-D -

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8/22/2009 1:13:40 AM (last edit: 8/22/2009 1:26:33 AM)
show user profile  Bobbyboy
Thank you very much for the reply error, makes things a lot clearer about the perspective issue.
There are so many little things that aren't the way they seem but I do like to know this stuff as well! we only stop learning when we're dead I guess! :D

btw, when was the last time you posted any pictures? haven't seen any in ages...... :(

read 417 times
8/22/2009 2:05:10 AM (last edit: 8/22/2009 2:05:10 AM)
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