entire frame, I have the same issue, much worse with a 2.8 24mm then it is with a 1.4 50mm on the front, I am trying to track down and help with the cause of this issue, I am thinking if we have the vibrations faster/bigger it will help..not sure yet...

You could check the shutter speed on your camcorder. If its set to fast it could pick up the grain of the glass. But in this senario the grain shouldn't be static or uniform...

Yes, all the optical/glass elements are clean.
The pattern is fairly uniform and covers the entire image. Interesting point with shutter speed, however, Jonny.
I did run through a gamut of shutter speeds with nearly identical results, the pattern still remains.
Would any of you suggest swapping out the GG with one of a finer grain?

I'd like to get this footage up. Any suggestions on where to upload video files so eveyone, including , Quyen, can take a look?
( Sorry, I've been making DV projects for a while now but have never put anything on the web). Thanks.

Gg
 

Well give www.yousendit.com the video... It will take a gig...
As far as the GG. I got a 1500 grit 2 inch GG from, Thorlabs for 15.00 I believe. The image looked good BUT I understand Optsigma has even a better 1500 grit GG. Not sure of the price...

Thanks, Craig. If this is the problem I'll look into that.
Also, I want to say that this problem aside, the adapter, for the money, is promising.
Considering Quyen got something out for purchase as opposed to talking about it (my forte) I think he did a very decent job.
I'm sure we'll be seeing a pitch perfect Letus35a? Sometime in the near future. Good job, Quyen.

Eric Brown

Thank you for bringing this up. I will look into that. Any video footage yet? One of possibilities I can think of is one or more of the white parts is too tight or trapped in the rubber parts. You can try this:
Take out the front part then use your fingers gently move the GG plane around about 3mm off center for about 4,5 times.
Also use clean water to gently rub the glass using your finger, then use soft cloth to clean it if the glass has any dirt.
Put it back and try again.
I don't see any grain if I use shutter speed of 180 or less with DV. I don't think HD will affect grain problem but I can be wrong.
Please post let me know if you have any success.
Also your macro size is 72mm, so you should use the cardboard mod on the other Letus35 thread. Thanks.

Quyen

Eric, Obin,

Did you turn the image stabilization off? I think you did but it won't hurt to ask, thanks.

Quyen

it's off

It really looks like the gg is not moving fast enough and the camera is "seeing" the grains that are now much larger in size and softer then if the gg motor is off...I don't know how to fix this, would weight on the gg make it better? I have used 4 AA cells on the unit and it's better, but still doing the same thing, and this is somthing you can see at 1/48 shutter...it really shows up on a wall or sky shot, less detail in the image shows the "screendoor" effect....the spinning units don't do this because the gg is spinning at a high speed?

lets get this issue fixed, as this adaptor is amazing, and very good for HD

This video is made using XL1-s and Letus35.
http://www.passouno.net/SPOT.ZIP
Thanks Giuliano Parodi.

Quyen

That looks really good.

Spot.
 

It looks very good indeed. And yet, color abberation. It's the only bad thing I can say.

Am I expecting too much? Or is this an issue that can be fixed?

[QUOTE=Obin Olson]it's off

It really looks like the gg is not moving fast enough and the camera is "seeing" the grains that are now much larger in size and softer then if the gg motor is off...I don't know how to fix this, would weight on the gg make it better? I have used 4 AA cells on the unit and it's better, but still doing the same thing, and this is somthing you can see at 1/48 shutter...it really shows up on a wall or sky shot, less detail in the image shows the "screendoor" effect...

Obin, this describes my experience down to the last detail. Are you using an XL2, Sony, DVX? Quyen, I will try your suggestions and see if this works.
Thanks!

It's a little too soft and too shallow for my tastes. But delicious footage nonetheless.

Kurt August,

Color abberation can be improved and we are working on this issue.

Eric,

Are you using XL2? what setting are you using? Did you see grain on white walls, the sky, or everything? I will test it myself later this week to see if I get the same thing.

Thanks

Quyen

Hey, Quyen.

Yes, it is the XL2. Settings are:

-3 gain
1/48th shutter
24p
16:9
f1.8

These were intial settings. I've stepped through different f-stops and shutter speeds and the effect remains. I've also tried the OIS on and off and this doesn't change it either.

I'll attempt the loosening of the gg as you suggested and the cleaning and get back with a post sometime today or tomorrow.
Thanks, Quyen.

I am getting MUCH better results with the 4 AA system now..I will post some HD test shots with the reel stream setup

still I think we need to re-think the plastic that holds the GG mount as I think more rubber would allow for the GG to "move" a bit more and really get rid of the "screendoor" effect on this unit, improveing it 1000%!!

Quyen???


maybe use some of the rubber from a CD-ROM mount? it's VERY soft and would allow for more play in the GG ...

BTW I made a rail mount for the unit and it's SO MUCH BETTER , you can touch the lens, focus etc and the thing does not move at all, no image shake in the shots from pulling focus now!

anyone who has the unit NEEDS to do this mod, take it to a professional level.

Obin,

Thank you for your suggestions. I will do all the possibility to get the GG plane to spin faster. Do you have a picture of your rail mount? Thanks.

Quyen

HD test in a min...compressing it now

Quyen, keep in mind that you will be dealing with LOTS of HD cameras soon, every glass element you have in your unit will have some results on teh final image, I know your unit is not that much money, but put the best glass in it you can afford, we will all see the results in HD ;)

Actually I think it looks way too soft. To the point where shots look out of focus.

Quyen Le, could you post a clip shot with the lens stopped down, so the DOF wouldn't be so shallow? Then we can have a better idea of the sharpness of the adapter. As shown in this video, it basicaly not usable for my applications. If you project that, it will look like it's all out of focus. Just not sharp enough.

http:////dv3productions.com/HD_dvx/Q_adapter-1.wmv

anyone have comments?

dvx100a Reel Stream output 1280x720 downsize from teh raw HD frames in aftereffects, basic color work in after effects, shot on a 85mm Nikon Nikkor at f1.4 using 4 AA cells to power the Q adapter and the micro35 achromat, mounted to the Micro35 Rail system with a wood mount to hold the front of the Q adapter on the rails so it's stable

Cannot download your footage, any password?

Obin,
What strength macro are you using there?

I cant download your footage, you URL looks odd?

Thanks,
Wayne

Obin, so far this is the best Lestus35 footage I have seen. It may be because it's HD rez, or because you are using the Micro35 achromat lens, which would indicate the Letus35 macro is of lower quality. But even though, it's nothing extraordinary. I think your footage with the realstream and the micro35 DIY looked sharper. Could you post some footage shot outside, maybe some trees, with wide shots and close ups?

Ok,
The URL had //// instead of // downloaded now. Footage looks great, nice and sharp. What strength macro are you using with the dvx100a?

Thanks,
Wayne.

I forgot, it had 6db of gain, that mames HD really grainy..I think outside footage will be really nice as you have so much light to work with


I can also tell you that the micro35 Achromat is MUCH MUCH better quality then the standard one that ships with this unit, I could not shoot HD with the standard Achromat.

Somehow all the footage I have seen from the Letus35 has been the most soft of all adapters. I have a real issue with sharpness. In my opinion, the sharpest of all these home built adapters, was the one made by the guy who converted the FX-1 to exchangeable lens. I think he was an Italian guy. The clips he posted were INCREDIBLY sharp. Neither the Micro35 or the G35 and certainly not the Letus35 produce nicer or sharper images. But I don't think he's selling them. I wonder what he got right.

I can tell you why it was sharp, he removed the stock lens!! that is the ticket, and what I will do soon on our dvx.

It's a SOFT lens, trust me.

Yeah, he had some other lens in there. What was it?
Do you think that lens was better quality and made the difference? The thing is he shot with a FX-1, which is HD, and his adapter held up great. You said the Letus35 doesn't. So the FX-1 guy did something different. Was really just the removal of the stock lens making the whole difference? If so, one could get similar results with a XL2 or HD100, which are exchangeable lenses.
I wonder how he got that lens to work with the whole system. It wasn't a zoom. I wonder what focal length etc.


You lost me here.

Michael,

Obin means the original lens on the DVX is soft. Hope this helps.

Quyen

can you shoot me a link to the guy that has the lens off the Fx cam? I want to talk with him about his relay setup for that system

[QUOTE=Michael Maier]Somehow all the footage I have seen from the Letus35 has been the most soft of all adapters. I have a real issue with sharpness. In my opinion, the sharpest of all these home built adapters, was the one made by the guy who converted the FX-1 to exchangeable lens. I think he was an Italian guy. The clips he posted were INCREDIBLY sharp. Neither the Micro35 or the G35 and certainly not the Letus35 produce nicer or sharper images.

The production G35's will be shipping with a bayonet mount for those cameras without a fixed lens, (XL2, HD100..) and threaded (obviously) for those cameras with a fixed lens.
As an XL2 owner I'm hoping this will help increase sharpness as I don't have to worry about "stacking' glass.
the Letus35 does produce great depth of field but does run short in the area of sharpness. No matter how much I try I am unable to produce a sharp picture with my camera and lenses.
But, this is a first run production. Perhaps Quyen will go to a different achromat eventually?
In the meantime I am patiently awaiting the G35.
But, yes, that FX-1 footage was indeed sharp! HD seems to love these adapters.

Obin, did you see Sean Porter's problem that cropped up when he replaced the stock DVX lens on his camera? What do you think the problem was with Sean's design?
http://www.dvinfo.net/conf/showthread.php?t=39420

He never posted a response so I'm wondering whether he resolved the issue.




Are you sure? Maybe Jonathan will verify and clarify...

Obin: http://www.eidomedia.com/hdve/ziess_fuji.htm and:
http://www.eidomedia.com/hdve/index.php for contact info

Cheers,
Steven

Wow, thanks Steven for the links.
So what's exactly involved in this conversion? Do you know?

The links still have some pics up in the gallery but not all. The conversion consisted of removing the stock lens, grinding off a couple of little plastic bits that were in the way, machining and installing a metal adapter plate, and mounting the new lens.

it's amazing the image quality of the new lens, and that's an SD lens?

shot a professional 30sec tv spot today with teh Letus35, really really nice footage from it, I will post some when I start to edit.

I read it at the source. It's one of the newer posts. Hopefully I'm not mistaken but I 'm positive bayonet mounts are indeed available.

One of the reasons I have not bought the redrockmicro.

Here's the thread:

http://www.guerilla35.com/talk/viewtopic.php?t=106

Eric, I read the entire thread again and I think you are misunderstanding Jonathan, or I am misunderstanding you, LOL

I got the impression you meant that the G35 would allow you to omit the original XL-2 lens and mount the G35 directly to the camcorder without a lens on the camcorder. If this is what you meant then I think you are mistaken.

Obin,

Are you refering to Matteo's lens or the lens you used with the LETUS 35 for your TV spot?