Letus Extreme Grain?

Cale Glendening

Cale Glendening

Active member
I got my Letus a few days ago and it is like I am getting constant grain in my shots.
I don't know why this is happening. Any would be great. I was testing with a shutter of 180 and below, also testing on f 1.8 to f 8.0 and I was still getting seeing some. On tests both, inside and outside(esp in the sky). I thought it may be the batteries being low so I replaced them, still getting the same thing.

Any help would be awesome.

Cale Glendening
 
First thing... is your unit vibrating? You can take off your lens and visually confirm that the motor is spinning and connected to the GG.

Another way is to focus on the GG with the unit off, turn it on... does the grain go away?


Sounds odd to check that but wires can get damaged in shipping... it is possible to have a Letus who's on light shines but the motor does not turn.



In any case... you can not go above an f4 on your slr lens without risking grain. 4 is my cut off without an HD monitor. Can you post a grab of grain on an f1.8?

It might help to see what's going on.
 
Keep it at or under f4 and you should be OK. At f8 you'll have visible vibration of the ground glass.

Blue sky and solid light walls are the areas where vibrating glass can have issues.

ND more to keep the stop open enough to eliminate the grain.

Also spend a great deal of time testing to learn the optimum settings for your lenses and how you shoot.

If you have to use high stops buy a spinning GG 35mm adapter as well... both have their uses... with spinning GG you can use higher stops.
 
Yeah I have the redrock m2, and got the letus so I could shoot better in low light. but damn I can't even stop down and get everything in focus. How frustrating. Now I even question keeping the letus or not.

: /
 
Never heard of that one before.
How much that one cost you?
How much light does it eat?
As much as the Redrock m2?

let me know!
 
THX-1138 said:
If you want to stop down you have to sell. There is NO work-a-round.
Click to expand...

Yeah I had and did 3 days of testing.
Love how it performs in low light but the fact f4 is all that can be done without grain, I am sending it back. Not cool at all.

Damn I love the redrock but it eats so much light!
Grrrrrrrrrrrrr
 
letus

letus

I'd give the guys at Letus a call. I've worked on a few adapters and the blur that you are seeing I had when the mounts weren't set right and the glass moved in only in one direction instead of all the pegs vibrating from the motor . I've got a new LEX and have had no grain problems. I'm sure they will help.
 
thekreative said:
I'd give the guys at Letus a call. I've worked on a few adapters and the blur that you are seeing I had when the mounts weren't set right and the glass moved in only in one direction instead of all the pegs vibrating from the motor . I've got a new LEX and have had no grain problems. I'm sure they will help.
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Yeah that is absurd to think it can't go above f.4
I will give them a shout tomorrow.

it just sucks cause I am on such a tight schedule with a big project. I have the redrock and the letus and I can only take one of them. So trying to weigh them both. I have heard both ways. Can't go above f.4 without risking grain, I can go above and not get grain. Jeez.
 
ND would seem to be your workaround here. And I think you should be able to go a little above f4. In my admittedly limited experimentation so far with the LEX it seemed it could go to f5.6 pretty well. That was indoors, but directly into a light source.

YMMV
 
Ted Spencer said:
ND would seem to be your workaround here. And I think you should be able to go a little above f4. In my admittedly limited experimentation so far with the LEX it seemed it could go to f5.6 pretty well. That was indoors, but directly into a light source.

YMMV
Click to expand...

So you are saying don't use the ND filter at all and it will help with the visible grain?
 
No, I meant ND it down, using the built-in one, or even better, one in a mattebox where you might have more choices. Then you can open the aperture wider, thus avoiding the grain.

Make sense?
 
I bet your ground glass is pushed in too far. If the ground glass frame is too close to the condenser the vibration becomes very strong and the grain shows up. It needs to be eased outward toward the lens mount a bit more to alleviate this.
 
Kholi said:
I bet your ground glass is pushed in too far. If the ground glass frame is too close to the condenser the vibration becomes very strong and the grain shows up. It needs to be eased outward toward the lens mount a bit more to alleviate this.
Click to expand...

Well how do you do that?
 
Well before I tell you to do taht could you post some video of wha tyou're seeing?

And post it wide open on the taking lens.
 
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