EX-1 Camera Zoom used in tandem w/ 35mm Adapter?

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EmileW

New member
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
 
Hey, I have no answers to your question, but I figured I'd bump it 'cause I´m very interested in the answer. Ideas anyone?
 
Shure you can zoom in on the groundglass, but the picture will look soft to softer depending on your zoom. You can also use autofocus on the groundglass with the EX3 you know.
 
The more you zoom, the more you are magnifying imperfection in both the achromat and the lens you are using. I've found there is some latitude, however, and the better the lens you are using and the better the adapter the more there is latitude.
 
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