Did someone say easy?

do you think there will be some vignetting if I were to use 58mm achromat instead of a 72mm. I noticed that Century optics doesn't make a 72mm +7 lense. It only goes up to +3 I believe.

I tried using a search but couldn't find any info on this.
 
I'm gonna say no. Vignetting doesn't necessarily have to anything
with the diamater of the achromat. I've heard the smaller the better
because less light to pass through? Something like that.
 
it's been a while since i annoyed anyone, so here i go. i just got all the parts in now, but when i put the d screen in the retainer ring, it sort of bends its shape as if forming from a circle to an oval. with this happening, i cannot put the ring/screen in the tube. did you take the screws off of the d screen and somewhat take it apart? please let me know.
 
Faceless,

The Dscreen fit snug just as it was when I received it. I just glued the four sides and it fit perfectly. I wonder if you have a different type of Dscreen. There are several I hear out there floating around.
 
mungk said:
do you think there will be some vignetting if I were to use 58mm achromat instead of a 72mm. I noticed that Century optics doesn't make a 72mm +7 lense. It only goes up to +3 I believe.

I tried using a search but couldn't find any info on this.
Click to expand...

I'm using a 58mm CO+7 with no vignetting. The key is to have the right distance from the diopter to the GG, if it's too short then you won't be able to get focus without vignetting. The 58mm size has nothing to do with it.
 
marlenedegrood said:
I'm using a 58mm CO+7 with no vignetting. The key is to have the right distance from the diopter to the GG, if it's too short then you won't be able to get focus without vignetting. The 58mm size has nothing to do with it.
Click to expand...

What's your (approximate) distance, marlene?
 
ok...i got the screen in. adapter is ready to go.
i'm having one heck of a time getting the thing focused. isn't there a certain way i should leave the dvx with the zoom and focus? any suggestions other than trial and error (with no luck so far, ha ha)
 
after messing around with it a while, i found a pretty decent sweet spot. i'll mess around a little more and put up some test footage soon. thanks guys!
 
The best thing to do is get your focusing screen (or GG) aligned at the correct distance from your 35mm lens. The way to do this is set the lens to focus at infinity and then adjust the distance between the lens and your focusing screen. Once that is in focus at infinity then you're good. Leave it focused at infinity, mount the adapter on your DVX, then zoom in the DVX and focus on your focusing screen. Once that is all set and you have good focus, don't touch the controls on your DVX again. All focusing will be done on the 35mm lens. If you have any questions just ask. Can't wait to see footage.
 
So it seems I have to add another 2 inches to my tube in order to be able to zoom onto the focusing screen all the way without having a black border around my image. Am i doing something wrong?
 
Hey,

I had a question concerning the Canon EF mounts, Ive got a bunch of prime lenses that I use with my 20d, now the aperture on these lenses is controlled electronically, I know the M2 adapter has an optional Canon EF mount for its adapter, does anyone know how Redrock did this.

Also where would you suggest getting these mounts, would it be best if I bought an SLR for parts. It seems everyone is using Nikon screens and mounts, may I ask why, is it cause its cheaper or easier to find, or does it work better.
Coming from a photographic background and recently getting into video production Ive always used Canon and was a big fan of Canon so I would like to stick to their lenses.

Thanks for any info in advance.
 
The M2's EOS mount works with the lenses stuck on wide open aperture. Same as the SGpro's EOS mount. Exposure of the image is controlled via the camcorders iris.
 
i think the reason most people go with the nikon lenses is it's cheaper and easier to come by with the ef you have to trick the aperature to stay open. check the canon FD? i think?
 
Sorry may be a weird quesetion.....

Sorry may be a weird quesetion.....

if we are trying so hard to get this light from the lens to focus on a GG....what not figure out the math which i know can be done and set the lens and the right distance such that the lens focuses the light onto to the imager aka the CMOS or CCD chip(s) in the camera. I have heard of some one removing the lens of their FX1 and replaceing it with a 35mm lens....could this be done without removing the lens? Ultimate goal o know but hey i think it should be a focusing point...
 
and voiding their warranty????? too risky unless you've got money and a fool proof set up aftewards so peple won't start braking their cam's left and right.
 
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