EX-1 Camera Zoom used in tandem w/ 35mm Adapter? at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Sony XDCAM EX Pro Handhelds
Sony PMW-300, PXW-X200, PXW-X180 (back to EX3 & EX1) recording to SxS flash memory.


Reply
 
Thread Tools Search this Thread
Old October 21st, 2009, 03:46 PM   #1
New Boot
 
Join Date: Jan 2009
Location: West Orange, New Jersey
Posts: 17
EX-1 Camera Zoom used in tandem w/ 35mm Adapter?

When I mount my 35mm adapter to the front element of my EX-1 lens, I need to calibrate focus first, and then adjust the CAMERA's zoom so that the image fills the frame. If I don't adjust the Camera's zoom, I run the risk of vignetting.

My question is, once I've found the sweet spot and mark the zoom barrel, can I zoom in further if I wish--in effect using the camera's zoom as a tele-extender--and if so, to what extent. Will I have image degradation if I do? Or should I just leave it on the sweet spot, and treat it as a fixed focal length lens.

For example, when I have a 50mm prime mounted on the adapter, the EX-1's zoom is set to about 40mm to fill the frame. If the zoom is set wider, I get vignetting. Zoom tighter--to say 80m--and I am in effect changing the mounted lens' focal length, making it longer. I wonder if there is perceptible image degradation.

I am new to video, so judging whether or not there is degradation, is not easy for my eye to see but I wonder what others think and have observed.

Thanks in advance for your help.

Cheers,

-Emile
Emile Wamsteker is offline   Reply With Quote
Old October 21st, 2009, 06:21 PM   #2
Major Player
 
Join Date: Jul 2007
Location: Richmond, VA
Posts: 229
No degradation that I've ever observed or could imagine in theory. It can be very useful to zoom farther in than the minimum to prevent vignetting. You can't really zoom within a shot and maintain focus, but I don't think that's what you're talking about.
Rob Collins is offline   Reply With Quote
Old October 21st, 2009, 10:56 PM   #3
New Boot
 
Join Date: Jan 2009
Location: Minneapolis, MN
Posts: 18
35mm adapter zoom

yes, it is possible if you need to do it. you don't get much zoom, but you get a little.
Jeremy Wilker is offline   Reply With Quote
Old October 21st, 2009, 11:06 PM   #4
Trustee
 
Join Date: Feb 2006
Location: USA
Posts: 1,684
You certainly can zoom in somewhat without quality loss on some adapters - (Letus Extreme, Ultimate or SG Blade) , but there are no hard and fast rules about it, and every camera/adapter combination is different. Some will suffer very badly from zooming in.
You simply need to figure out what looks good to you and good monitoring is very helpful.
Don't assume that your video cameras focus will remain sharp as you zoom in on the Gr glass screen. Double check it at every focal length.

A very good idea is to find something flat and sharp as a reference and experiment. I blew up a lens resolution chart to various sizes & mounted them on foam core. The first problem you may see is that your corners may start to go out of focus as you zoom in.

Usually not a good idea to go zoom in too far as you are increasing the grain size in the screen and compromising the optics of both the adapter achromat and the 35mm lens.
Leonard Levy is offline   Reply With Quote
Old October 28th, 2009, 08:32 AM   #5
New Boot
 
Join Date: Jan 2009
Location: West Orange, New Jersey
Posts: 17
Thanks for the feedback. I posted the same query to another forum and received the same feedback. No lone dissenters suggesting otherwise.

I've since run some tests, and don't see any degradation in quality. Then again, my eye is still not quite trained for video, so there may be some things there that I'm just not seeing.

Nevertheless, in the meantime, I will use this technique with confidence, as long as I don't "push to far" as suggested.

Thanks again for your comments.

Cheers,

-Emile
Emile Wamsteker is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony XDCAM EX Pro Handhelds

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 08:43 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network