Looking to upgrade condenser

David Delaney · July 22nd, 2006, 10:48 AM

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.

July 22nd, 2006, 10:48 AM	#1
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	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?

July 22nd, 2006, 11:04 AM	#2
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	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. __________________ Thanks, Wayne.

July 22nd, 2006, 11:10 AM	#4
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	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? __________________ Thanks, Wayne.

July 22nd, 2006, 11:25 AM	#6
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	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. __________________ Thanks, Wayne.

July 22nd, 2006, 11:33 AM	#8
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	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. __________________ Thanks, Wayne.

July 22nd, 2006, 11:06 AM	#3
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	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...

July 22nd, 2006, 11:21 AM	#5
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	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.

July 22nd, 2006, 11:27 AM	#7
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	It looks like this : DV>condenser>Letus Macro>Rectangular achromat>GG> SLR Without the said condenser, lots of vignetting.

July 22nd, 2006, 11:42 AM	#9
David Delaney Trustee Join Date: Feb 2006 Location: Niagara Ontario Canada Posts: 1,121	Thanks Wayne.