Datacolor User to User Support Group.

I happen to own cork backed stainless steel rules in 18 and 24 inch lengths; they work just fine this way. Since the rule is centered on the LensCal unit, which is mounted on a tripod, there are no structural or stability issues. 

C. D. Tobie
Global Product Technology Mngr.
Digital Imaging & Home Theater
Datacolor.com
CDTobie@...

On Oct 17, 2010, at 9:27 PM, "bwinkjet" <bwinkjet@...> wrote:

> To check close focus adjustment the tool works very well provided a tripod is used for camera and the lens cal tool is stationary and relatively parallel to the camera sensor.  The problem I have encountered is that using Canon's and other's recomendations that the distance be 50 times the focal length of the lens is the entire ruler is pretty much in focus at this distance especially with f4 or smaller aperatures.  What stability is there with the steel ruler and how long is the one you use?  Perhaps Spyder could come up with an accessory ruler to allow calibration at the recommended 50 times focal length?  I have used the device to focus close, set the micro-adjust setting, and then picked more distant objects to see if correct focus persists when focused further away.  So far this has worked on a Canon 24-105 f4L fairly well.
> Paul
> 
> --- In datacolor_group@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
>> 
>> Not sure the rule would be your limiting factor, but I've used rubber bands to put a longer steel ruler onto the LensCal rule in cases where I wanted to determine in a single pass just where the "zone" was...
>> 
>> C. D. Tobie
>> Global Product Technology Mngr.
>> Digital Imaging & Home Theater
>> Datacolor.com
>> CDTobie@...
>> 
>> On Oct 17, 2010, at 3:11 PM, "Lloyd O'Daniel" <lhodaniel@...> wrote:
>> 
>>> 
>>> 
>>> I need to buy one of these devices. I certainly like the price and simplicity of the SpyderLensCal over the LensAlign. The lens that I need to calibrate most is a Nikon 80-400VR with my new D700. Calibrating @ 400 @ 25 to 50 times fl would be in the 33 to 65 ft range. That, coupled with a f/5.6 max aperture, makes me wonder if depth-of-field would render SpyderLensCal useless under these conditions. LensAlign sells a long ruler kit for this situation. Would I be able to use the standard ruler of the SpyderLensCal satisfactorily for this lens?
>>> 
>>> 
>>> 
>>> 
>> 
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