Infinity not in focus. at DVinfo.net

Matt Buys · July 3rd, 2008, 08:41 PM

I've tried to get infinity into focus on my letus and my hv20 with no success despite using every nikon lens I have from 35mm on up to 105mm. Focus works great from anywhere inside sixty feet. Any suggestions or comments would be helpful.

Dennis Wood · July 21st, 2008, 11:14 PM

This is a collimation issue meaning your nikon lens mount is not the correct distance from the imaging plane. We call this feature "micro-collimation" and have a video on the subject on our site. It's a different adapter but the same principles apply. Hope that helps.

Dennis Wood
www.cinevate.com

Chris Barcellos · July 22nd, 2008, 12:18 AM

Matt: You have to get the flange( backend ) of Nikon Lens about 46.5mm from the ground glass. In my old Letus 35a, I have to do it by manually adjusting the screen on the suspension posts.

I think the new Letus rigs have adjusting screws.

When you can't reach infinity, it means you will have to move the screen a bit closer to the lens. If you focus through infinity, you have to increase the distance.

Bob Hart · July 22nd, 2008, 06:08 AM

Matt.

Could you advise which model Letus you have?

John Lewis · May 21st, 2009, 06:36 AM

This is useful info. I'm having a similar backfocus issue with my version of the Daniel Schweinert adaptor. My footage is coming out a little soft at infinity.

July 3rd, 2008, 08:41 PM	#1
Matt Buys Major Player Join Date: Aug 2006 Location: Asheville NC Posts: 426	Infinity not in focus. I've tried to get infinity into focus on my letus and my hv20 with no success despite using every nikon lens I have from 35mm on up to 105mm. Focus works great from anywhere inside sixty feet. Any suggestions or comments would be helpful.

July 22nd, 2008, 12:18 AM	#3
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	Matt: You have to get the flange( backend ) of Nikon Lens about 46.5mm from the ground glass. In my old Letus 35a, I have to do it by manually adjusting the screen on the suspension posts. I think the new Letus rigs have adjusting screws. When you can't reach infinity, it means you will have to move the screen a bit closer to the lens. If you focus through infinity, you have to increase the distance. __________________ Chris J. Barcellos

July 21st, 2008, 11:14 PM	#2
Dennis Wood Major Player Join Date: Mar 2005 Location: Ontario, Canada Posts: 916	This is a collimation issue meaning your nikon lens mount is not the correct distance from the imaging plane. We call this feature "micro-collimation" and have a video on the subject on our site. It's a different adapter but the same principles apply. Hope that helps. Dennis Wood www.cinevate.com

July 22nd, 2008, 06:08 AM	#4
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Matt. Could you advise which model Letus you have?

May 21st, 2009, 06:36 AM	#5
John Lewis Regular Crew Join Date: Oct 2004 Location: London UK Posts: 36	This is useful info. I'm having a similar backfocus issue with my version of the Daniel Schweinert adaptor. My footage is coming out a little soft at infinity.