Larry Truex
23rd December 2009, 10:15 AM
I must address this to Mr. Tapes...I have been in contact with a rep from Zeiss lens to address a focus problem...the captured image doesn't reflect the focus that was set in the view finder. The rep suggest setup and focus in live view on an enlarged screen not the camera lcd...this eliminates all focus screen associated issues. Their view is Zeiss do not have focus issues and it must be the camera or associated focus system, but when I focused an image using using my 15in. laptop with BreezeSys remote. the captured image after being critical focused in live view was not sharp and crisp (digital defies what seems impossible) and I need advise to setup further test to illustrate precisely the finding using the LAPro system. I do have the means to create the embossed look, but need advise to set up the critical lighting and adjustment to render the highest image quality from the LensAlign System. I have the LAsys setup shot and a comparison against my Canon 100mm macro lens (no focus issue with that lens). Need advise Larry
MichaelT
24th December 2009, 08:59 AM
...the captured image doesn't reflect the focus that was set in the view finder.
This would tend to indicate a problem with the MF system in the camera.
...when I focused an image using using my 15in. laptop with BreezeSys remote, the captured image after being critical focused in live view was not sharp and crisp (digital defies what seems impossible) and I need advise to setup further test to illustrate precisely the finding using the LAPro system.
As you point out, if the image is critically focused using Live View on an external monitor, the captured image should be as sharp as it can be. The issue you have to be careful of is that there are 2 things going on here. The first is to ensure that the lens is focused precisely on the subject of interest directly on the image sensor, Live View manual focus should assure that. However, the other issue of concern, is how sharp is the actual capture.
In other words the focus can be perfectly correct, but the lens (with the development that you have done) is not as sharp as you want it to be.
The best way to test this situation is to use LensAlign, but rather than focus on the focus target, use Live View to focus directly on the "0" line of the Ruler Display. In this way we ensure that that the focus position on the sensor (via live view) is correct. What we should see in the captured photo is the "0" line in at the most sharp in the shot, and the focus falling off from there. That would mean that the focus is correct. You can then subjectively evaluation of "visually sharp" the captured image looks. I would also suggest focusing wide open, but then without changing focus, take a few shots with each stopping down the aperture so that you can see how much the sharpness increases based on stopping down the lens.
Also remember that ALL digital captures are softened by the camera's AA filter and must be sharpened in the end.
Hope this helps...
best...
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