Half Inch Lens Adapters at DVinfo.net

Alister Chapman · May 8th, 2006, 02:38 AM

If you buy a 2/3 to 1/2 inch lens adapter ensure that it has a glass element. Some of the cheaper adapters don't have any glass in them, they simply place the lens at the correct distance from the focal plane so that it will focus correctly.

The glass isn't a lens, it's just an optically flat piece of glass but it is needed to compensate for the different prisms. Without it there will be a small registration error between the R, G and B channels which will show up as slight fringing or image softening.

David Mintzer · May 12th, 2006, 11:25 AM

Quote:

Originally Posted by Alister Chapman

If you buy a 2/3 to 1/2 inch lens adapter ensure that it has a glass element. Some of the cheaper adapters don't have any glass in them, they simply place the lens at the correct distance from the focal plane so that it will focus correctly.

The glass isn't a lens, it's just an optically flat piece of glass but it is needed to compensate for the different prisms. Without it there will be a small registration error between the R, G and B channels which will show up as slight fringing or image softening.

Alister, I assume you have a glass one---what have you found the quality of images shooting 2/3 lens on the camera?

Chris Hurd · May 13th, 2006, 01:25 PM

May I assume the reverse is true as well... when going from a 1/2" mount on the F330 and F350 up to a 2/3" lens?

Alister Chapman · May 15th, 2006, 08:14 PM

Have not tried any decent 2/3 inch lenses yet. As soon as I do I'll let you know.

Chris Hurd · May 15th, 2006, 08:54 PM

For our Texas HD Shooutout we had to resort to a 2/3rd-inch adapter on an F350 that Scott Cantrell brought up from Houston (this was after Mike Devlin had to head home with his F350). Here's a pic. Thought I had a pic of the adapter by itself but I can't seem to locate it right now. Nor can I recall if this adapter had an optical element, but I can easily find that out.

Simon Wyndham · May 16th, 2006, 02:33 AM

The adaptor doesn't have an optical element. The focal length of the lens also multiplies by 1.37 with the adaptor attached.

Despite this magnification I would recommend using it with 2/3" lenses over getting 1/2" ones simply because 2/3" lenses will last you longer and allow you to 'upgrade' to a 2/3" HD camera later.

David Mintzer · May 16th, 2006, 06:15 AM

Quote:

Originally Posted by Simon Wyndham

The adaptor doesn't have an optical element. The focal length of the lens also multiplies by 1.37 with the adaptor attached.

Despite this magnification I would recommend using it with 2/3" lenses over getting 1/2" ones simply because 2/3" lenses will last you longer and allow you to 'upgrade' to a 2/3" HD camera later.

Which 2/3 inch lens do you like? Chris, which 2/3 lens did you use during the shootout?

Greg Boston · May 16th, 2006, 06:20 AM

Quote:

Originally Posted by Chris Hurd

For our Texas HD Shooutout we had to resort to a 2/3rd-inch adapter on an F350 that Scott Cantrell brought up from Houston (this was after Mike Devlin had to head home with his F350). Here's a pic. Thought I had a pic of the adapter by itself but I can't seem to locate it right now. Nor can I recall if this adapter had an optical element, but I can easily find that out.

There was no glass in the adapter, Chris. I was the one who dismantled the camera at the end of the shoot (remember me asking you where the adapter's cover was).

-gb-

David Mintzer · May 16th, 2006, 02:30 PM

Quote:

Originally Posted by Greg Boston

There was no glass in the adapter, Chris. I was the one who dismantled the camera at the end of the shoot (remember me asking you where the adapter's cover was).

-gb-

So guys, how did the XDCAM HD do in the shootout?

Chris Hurd · May 17th, 2006, 11:55 PM

I'm leaving that one for Adam Wilt to answer in his article for DV Magazine. Plenty of other folks who were present for this might have their own input though.

Thierry Humeau · May 18th, 2006, 06:12 AM

Quote:

Originally Posted by Greg Boston

There was no glass in the adapter, Chris. I was the one who dismantled the camera at the end of the shoot (remember me asking you where the adapter's cover was).

-gb-

I only know of two adaptor. One made by century optics (schneider) and one by Canon. The adaptor shown on the picture looks exactly like the one sold by Sony (actually made by Canon) which I have. It does have glass. If you are serious about making the f330/350 your prime camera, I would invest in 1/2" CCD lenses (the nice ones wiht doubler). I found the adaptor to be a less than satisfactory solution for the reasons bellow:

- to much loss in angle of view
- to much loss in light sensitivity (at least 1/2 step)
- makes the camera forward heavy because it pushes the lens further forward.

Thierry.

May 8th, 2006, 02:38 AM	#1
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	Half Inch Lens Adapters If you buy a 2/3 to 1/2 inch lens adapter ensure that it has a glass element. Some of the cheaper adapters don't have any glass in them, they simply place the lens at the correct distance from the focal plane so that it will focus correctly. The glass isn't a lens, it's just an optically flat piece of glass but it is needed to compensate for the different prisms. Without it there will be a small registration error between the R, G and B channels which will show up as slight fringing or image softening. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

May 13th, 2006, 01:25 PM	#3
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,369 Images: 513	May I assume the reverse is true as well... when going from a 1/2" mount on the F330 and F350 up to a 2/3" lens? __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

May 15th, 2006, 08:14 PM	#4
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	Have not tried any decent 2/3 inch lenses yet. As soon as I do I'll let you know. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

May 15th, 2006, 08:54 PM	#5
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,369 Images: 513	For our Texas HD Shooutout we had to resort to a 2/3rd-inch adapter on an F350 that Scott Cantrell brought up from Houston (this was after Mike Devlin had to head home with his F350). Here's a pic. Thought I had a pic of the adapter by itself but I can't seem to locate it right now. Nor can I recall if this adapter had an optical element, but I can easily find that out. Attached Thumbnails __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

May 17th, 2006, 11:55 PM	#10
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,369 Images: 513	I'm leaving that one for Adam Wilt to answer in his article for DV Magazine. Plenty of other folks who were present for this might have their own input though. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

May 16th, 2006, 02:33 AM	#6
Simon Wyndham Trustee Join Date: Dec 2003 Location: Malvern UK Posts: 1,931	The adaptor doesn't have an optical element. The focal length of the lens also multiplies by 1.37 with the adaptor attached. Despite this magnification I would recommend using it with 2/3" lenses over getting 1/2" ones simply because 2/3" lenses will last you longer and allow you to 'upgrade' to a 2/3" HD camera later.