L extreme setup

PaPa

PaPa

Major Contributor
FOR A1 USERS

I just purchased some cinevate rails to balance out this massive unit thats holding itself at the front of my camera lol. But my question was more related to zoom and focus.

For canon XH A1 owners, what is your zoom and focus setup?

Right now i am using zoom 80 and focus 4.9 feet ( have a uv filter on the camera as well )

This seems to give me a sharp image with nikon mount and nikon lenses. I know the adapter loses about .5 stops, but with the additional light lost due to the A1 zooming in and closing itself down to F2.6, you lose an additional stop and a half.

Would i need to zoom in significantly less if i removed the UV filter? Should i?

but wow, this thing is very well put together,. mega impressed.
 
I used Z71 or Z72ish focused also at 4.9 feet. I don't know how much the UV filter affects zooming, but I imagine it will change your focus point. Try it out and let us know.
 
i tried 72 as it looked good on the lcd screen, but as i knew the lcd shows and underscanned image, i zoomed in a little more than, i think it was 68, then brought it to 72. I then plugged it in my computer and opened a capture window where i noticed there was quite a bit of vignetting going on, so i found that around zoom 80 it went away, at the sacrifice of stopping the cameras lens down to 2.6

regardless, at 72 i believe it is the same, if not 2.4 so very small difference.
 
I saw some vignetting as well around 68. Is there any offset in yours? Mine hung right a little bit as seen here: http://www.dvxuser.com/V6/showthread.php?t=115242

I just loosened the 3 screws near the achromat, positioned the LEX so the ground glass was closer to center, and tightened the screws. No more vignetting past Z70, though I suppose it could be different with certain lenses.
 
Why aren't you guys zooming into a proper 35mm frame size, not just "what looks good"?

That's the whole point of a 35mm adapter...to emulate 35mm film camera frame size....or so I thought.
 
Firstly, how do you know what is the proper 35mm frame size when using an adaptor? And secondly, how do you calibrate it to do away with vignetting once you've found that?
 
trudd said:
I saw some vignetting as well around 68. Is there any offset in yours? Mine hung right a little bit as seen here: http://www.dvxuser.com/V6/showthread.php?t=115242

I just loosened the 3 screws near the achromat, positioned the LEX so the ground glass was closer to center, and tightened the screws. No more vignetting past Z70, though I suppose it could be different with certain lenses.
Click to expand...

i have the same issue, it does hang slightly to the right but i don't know how to fix it, how exactly are you repositioning it? im too nervous to move things around, i dont want to screw with such a tank.
 
Find the 3 hex screws that hold the threads to the achromat. Loosen them while the Lex is attached, position it so the GG is level and just move it until the GG is more centered. Tighten screws.

Hm...just had a thought. Would this create softness on one side, since teh achromat may or may not be square to the lens?
 
thats the kind of thing im worried about and dont wanna screw around with.
Also, i believe to get more relative to 35mm frame size, that you need to zoom in more than the vignetting shows for, so i think zooming to 80 is pretty safe.

does anyone have the exact numbers?
 
I quickly calibrate my adapters to roughly a 35mm frame size by taping a 8.5 x 11 inch piece of paper on the wall and then set my camera up 2 feet away from it. With a 50mm lens focused in to 2 feet, I zoom in just enough to crop off the edges of the paper. At this setting, I don't have any vignetting with the LEX and a 50mm lens wide open at f1.8.
 
what camera are you using leo? and if its the A1, do you mind sharing your zoom setting?
 
Currently, I have it set up with a Canon HV20; the zoom setting is around the 50% mark (no numbering on the HV).
 
hmm, no doubt the two cameras have very different zooms so it will be impossible to compare really.

so you are suggesting to have my lens focus placed at 2 feet, space the camera apart from a wall which has a letter sized sheet so that the 2 foot focus mark is nice and sharp, and then zoom in to match to border of the sheet?

Should i do this wit hthe cameras underscanned lcd image? Or should i plug the camera into a computer to view the whole overscanned image? Because they will both offer very different results.
?
 
You guys need to read the Letus FE review that Barry posted a while back. It tells you how to calibrate the FE for 35 frame size. It's the same for the EX.
 
so i just gave it a try, and it seems like zoom 80 on the A1 was the magic number. Either Barry or Stephen, care to put in their own two cents?
 
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