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-   -   Looking to upgrade condenser - any suggestions? (https://www.dvinfo.net/forum/alternative-imaging-methods/72038-looking-upgrade-condenser-any-suggestions.html)

David Delaney July 22nd, 2006 10:48 AM

Looking to upgrade condenser - any suggestions?
 
My condenser is pretty good, but I am getting some softness along the edges and some barrel-distortion. IT is concave and not the cemented one (I can't remember what that is called). That is why I am getting softness, I believe. So in the market for a better one, a strong one. Any suggestions?

Wayne Kinney July 22nd, 2006 11:04 AM

David,

Are you using it against the GG to eliminate vignetting, or close to the camcorder as a close up lens? I have 3 brand new, unopened 50mm PCX lenses no longer needed.

David Delaney July 22nd, 2006 11:06 AM

I am using it to combat vignetting. I have it right against my DV camera lens right now (the condenser). Interestingly enough, it seems to work best against the camera lens...

Wayne Kinney July 22nd, 2006 11:10 AM

David,

To eliminate vignetting, it needs to be close to the GG, not the DV lens. This will give you massive softness. What is the spec of the lens your using?

David Delaney July 22nd, 2006 11:21 AM

Well, with the Letus35A, it already has a rectangular achromat next to the GG - and as I had heard before from other (including myself now) - there is still vignetting. Putting the condenser right beside the DV camera lens really really helps and completely eliminates the vignetting, but of course, now the softness comes in.

Wayne Kinney July 22nd, 2006 11:25 AM

David,

I simply dont understand. The closer the PCX is moved towards the camcorder, the more the vignetting should increase, not the other way around.

David Delaney July 22nd, 2006 11:27 AM

It looks like this :

DV>condenser>Letus Macro>Rectangular achromat>GG> SLR

Without the said condenser, lots of vignetting.

Wayne Kinney July 22nd, 2006 11:33 AM

David,

OK, this makes more sense now. I think you should contact Quyen Le. Best way to eliminate the vignetting is a stronger PCX (to replace the rectangular one) or to increase distance between GG and cam.

David Delaney July 22nd, 2006 11:42 AM

Thanks Wayne.


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