Letus35 Extreme vignetting

I would have to ask what it mattered if it vignettes without any lens? Does it vignette when a lens is on? LOL

My unit does the same thing... it's just a good thing I don't walk around shooting without a lens on the unit or I would be in trouble.
 
Okay, here's a couple of problems with the adapter.

This picture I grabbed shows the vignetting around edges without any lens on all the camera lens is all zoomed in with aperture turned up all the way.
Here's the video clip. Sorry it's so compressed.

This picture shows the vignetting when I put on the Nikkor 50mm f/1.4 lens on the adapter and zoomed to a white wall.
Video clip that shows the vignetting when the lens is attached.

And this picture shows the vignetting too around the ages when focused on a basket at the corner.
And this clip shows the vignetting problem as well as when the images are slowly comes to halt when I already stop panning.

And there is also another problem with using the adapter. Whenever I pan the camera, the picture catches up and slowly comes to a stop when I already stop panning half a second or so.

I'm in the process finding a place to host the video clip so you'll see the problem I'm talking about.
 
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And there is also another problem with using the adapter. Whenever I pan the camera, the picture catches up and slowly comes to a stop when I already stop panning half a second or so.
Click to expand...
TURN OFF YOUR OPTICAL STABILIZER. IT DOES NOT WORK WITH A GG.

No one has mentioned this...But the GG frame should be horizontal. Is possible to get the adapter flipped around so that the GG frame is vertical and you will see some vignetting.


I don't mean any disrespect, this forum is great because it brings pros together with beginners and everyone in between in a very open learning environment. I think that you could eliminate some of your frustration by reading all the stickies in this forum. I certainly have learned a lot of great info from the guys in this community. I am just saying that a better understanding of how and why 35mm adapters work might benefit you. We all had to start somewhere, but a lot of your confusion could be eliminated by reading some of the great info in this forum.


Good Luck!
 
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My Charlie - vignetting or any other optical observations without a lens on the adapter are probably of no significance at all unless you can show they relate to performance with a lens in place. Your adapter was not made to produce an even field without a 35mm lens.
Are you getting vignetting with a lens in place when zoomed into the proper distance to simulate SLR performance? That is what is relevant.

- Lenny Levy
 
Thanks, Jason. I'll turn the optical stabilizer off and see what happens. I believed the GG already lined up horizontally against the camera's lens. I use a rail system so the way I see it is that there is only one way to attach the adapter. There is a screw hole in the bottom front of the adapter for attaching a support and then the other end is where it attaches to the camera lens. Isn't this the correct way to attach the adapter?

And yes, I do give those stickies some reading but it's just so many pages that it's going to take some time especially when a person has a toy to play he tends to forget about the manual.


Lenny, yes. I do see the vignetting even if I attached the lens. As I mentioned in my earlier post, the put in a Nikor 50mm f1.4 and I still see the vignetting. Take a look at this picture and this one.

Thanks for all input. I appreciated very much.
 
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http://i180.photobucket.com/albums/x233/ljCharlie/Vignetting_picture_moving.jpg

You need to zoom in just a little bit further and voila, no vignetting. This is exactly what I was confused about. You really need to zoom in quite far in to the gg. Seems like a waste of ground glass dont it :)

Here's how you can set your mind at ease. Take off your LEX from your camera, mark how much of your sofa and wall you can see with your cameras wide angle. Then put on a 20mm or 24mm lens and you will notice that even when you zoom in on the ground glass enough to get rid of the vignetting you will see as much of your sofa as you could see with your cameras lens on full wide angle.

Sami
 
Essami, thanks for the input. I'll give that a try. However, when you say "zoom in just a little bit", are you referring to my Sony EX camera lens? If so, I already zoom in all the way to Z99 and I still see the vignetting. If you are referring to the Nikon lens, well, there is no zoom. It's a prime lens. All of the vignetting pictures shown above were all taken with my camera lens all zoomed in at Z99.
 
That is quite a strange problem. If you've zoomed in all the way the LAST thing you should be experiencing is vignetting. Someone in the thread mentioned the unit's GG being sideways, it should be horizontal but it looks like yours is horizontal.

Hmmm.
 
lol, people, if his GG was vertical, the letus unit would be protruding on the left or the right. He'd know :p
 
I'm quite positive that the GG is horizontal because as far as I see it, there is only one way to attach the adapter to the camera lens on a rail system with the adapter support on the bottom.

Yes, I did contact LetusDirect. I just emailed them those three still pictures I grabbed from the footage.

I really hope there is a way to resolve this vignetting.

Many thanks for all your support.
 
No, I have not post to their forum yet. I posted here first because not a lot of people are reading or responding in their forum. But yes, I will.

Yes, it's Aaron. I guess I'll have to wait another one or two more days for Aaron's response. But I'm just anxious to get this thing to work.
 
myCharlie said:
Essami, thanks for the input. I'll give that a try. However, when you say "zoom in just a little bit", are you referring to my Sony EX camera lens? If so, I already zoom in all the way to Z99 and I still see the vignetting. If you are referring to the Nikon lens, well, there is no zoom. It's a prime lens. All of the vignetting pictures shown above were all taken with my camera lens all zoomed in at Z99.
Click to expand...

Yes I meant you should zoom in just a little more with the EX1 but if your at full tele then that certainly is weird. Ill send you a pm so you can see my footage.

Sami
 
Okay, I just viewed Essami's footage and it does shows the exact problems that I have. The center is sharpest/brightest and turns softer and darker as it gets close to the edes of the frame. Is this normal? If it is, I don't think I can shoot like that when all the edges are slightly darker and the middle is much brighter. This is the not "edge to edge" sharpness that people are talking about. If this is true of all adapter then I'm regretting pay $1,245 for mine Lex35.

By the way, will anyone show me some of your footage with the Letus35 Extreme adapter on? I want to see how it suppose to look llike so I can compare it to mine.
 
Kholi, thanks for your footage. I certainly see some vignetting in the footage especially all the wide shot of the surfer. It's hard to see any vignetting when you zoomed in close. Whatever it is that is creating this vignetting, I hope there is a way to fix it. I won't want to waste the money to an adapter that I can only use to shoot wide shot.
 
The vignetting you see is definitely me. I'm getting used to controlling the HVX zoom while shooting because I like the feature. I've got some locked down footage somewhere here that exhibits no vignetting what-so-ever.

I'll walk out and shoot some today just for you with my 17-35, 50, and 85mm if I get a chance, or just re-upload some other stuff. I'm noticing that the 70-210 needs special attention for whatever reason, but the others abide by the 27.3 setting I usually use. Go figure.
 
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