SGpro rev. 3 vs Letus35 Extreme - Part I

Lenilenapi said:
Kholi,
You may be confusing me with someone else. I haven't complained about the 28mm or 35mm or any lens in particular. Actually i haven't had time to test the individual lenses on the different adapters at all.

The issue I did grind into the ground (admittedly) is that all of the adapters I tested had a different optimum plane of focus for the center and the corners of the frame. I saw this for sure on the Brevis and on the Letus Extreme. My memory is that the SGpro was better but I wouldn't swear to it. I think my Brevis CF1L and my Letus are similar but I haven't checked carefully and I would have to check it with each lens. If anything memory tells me the Brevis was better but I could be completely wrong.

I also ground into the ground that I only trust focus when it is done on a chart after the 35mm lens is up. So i'm dubious about reports that one adapter is sharper than another unless a chart is used for careful set-up. Also is it center focus that's sharper or overall focus after finding a compromise back focus point?

I think a chart is the only way to really see what's going on. Its easy to download one as a file and get it blown up at Kinko's then carry it around.

For the record though, I don't like any soft corners. I don't know what you are saying about the Brevis having too strong an achromat though. You might be right but mine had pretty decent center to corner.
Alot of my bread and butter are interviews and it doesn't matter for that stuff.

- Lenny
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Thanks for the explanation. I was speaking on the 28mm and 35mm in general, as the widest lenses exhibit loss in edge sharpness from what I've seen. Although very minimal in most cases.

I'm not talking about the Brevis having a strong achromat at all. I mean that it's physically too close to the camera. I can point out, in all Brevis footage minus adapter, a soft right side. It exists in every single still and Brevis video I have ever seen aside from the Flip Footage.
 
You've mentioned that thing about the right side before but I've never seen it. How far into the frame on the right side are you talking about?

I've never had a client complain. I look at a chart carefully everytime I've set up. I think I'd notice if one side was soft. It should be obvious on a chart immediately.
 
Lenilenapi said:
You've mentioned that thing about the right side before but I've never seen it. How far into the frame on the right side are you talking about?

I've never had a client complain. I look at a chart carefully everytime I've set up. I think I'd notice if one side was soft. It should be obvious on a chart immediately.
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http://www.cinevate.com/images/stillmotion/fortgeorge.mov

At any apparent time in this video you can pause it, or even just look on the right side (and a bit of the left) and see the effect I'm talking about. It's SMEAR. Like someone rubbed Vaseline and Water on the glass and tried to clean it off.

This disappears with the Brevis + Flip immediately.

http://cinevate.com/phpBB2/viewtopic.php?t=1621

These are great productions, not discrediting them at all. You can see the smear on the right side of the frame in each one, and it's not defocus or anything like that. I'm baffled at how people don't see this.
 
I own a Letus Extreme. The sharpness I'm talking about is exhibited in Dennis Woods footage. To which Dennis himself actually said (could've sworn I read it in a DVXuser post) that Edge-to-edge sharpness improved with the flip unit.

Just looking at the Brevis Flip Footage that Dennis posted I saw a major improvement in image quality. Then again, it's hard for most people to see what I'm seeing anyway.
 
On the right softness

On the right softness

Kholi said:
It's weird how 1 out of 4 people see it.

Showed this clip: http://www.cinevate.com/images/stillmotion/health.mov

To someone and they saw it on the right side, another person couldn't see it. Guess it matters who's lookin'. If you don't see it, I guess it doesn't matter.
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Twenty six seconds in I saw a weird smear on the right side. It kind of looks like a post blur IMHO. Not saying it is, just saying it looks that way. The blur does not appear to be DOF. It looks like it is a mask blur. As the hiker walks toward the right side of the frame it begins to sharpen. My problem with it is that the hiker's transition from one side of the frame to the other is consistent. He stays in focus the entire time with out venturing any closer nor further from the shots source, but as he walks to the right of the screen the soft blur begins to come into focus. Its really weird.
 
ifownlee41nite@mac.com said:
Twenty six seconds in I saw a weird smear on the right side. It kind of looks like a post blur IMHO. Not saying it is, just saying it looks that way. The blur does not appear to be DOF. It looks like it is a mask blur. As the hiker walks toward the right side of the frame it begins to sharpen. My problem with it is that the hiker's transition from one side of the frame to the other is consistent. He stays in focus the entire time with out venturing any closer nor further from the shots source, but as he walks to the right of the screen the soft blur begins to come into focus. Its really weird.
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Thanks for confirming that I'm not insane. I see this in a LOT of Brevis footage, and it shifts from the left to the right side of the image. Now that I think about it, the soldiers walking might have been flipped vertically, but not horizontally. Which is why I see it on the left and not the right.

It's also common, I'm ruling out lens fall-off due to that. Although, the Brevis Flip footage seems to change that. I would like to see more, but I'm wagering that the new distance between components fixes the "non-existent" issue.
 
As I take another look at the footage it looks like a focus wipe from the left side of the footage to the right side. It just does not look real to me. If you look at the footage 26 seconds in the leaves on the left side of the footage are in focus, and so are the logs on the ground in the back round. Now look to the right side of the screen where the big rock is located at about the same distance from the shot source. It is completely out of focus along with everything else on that side of the frame.

I don't know how to call that. It just looks odd to me.
 
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