Re: [APML] Orion Mosaic (finally done)

[john laborde <jlaborde@ix.netcom.com>]

Wade,

The rear lens on the FSQ-106 is around 72 mm so I don't think adding a 
72 mm filter makes much difference in the vignetting characteristics. 
The optics with or without the filter does have a noticeable vignetting 
pattern on 6x7 format. One of the first processing steps I take with all 
my 6x7 shots is to flat field the image.

John

Thomas W. Earle wrote:

>John,
>
>Thanks for the detailed response.  
>
>I have two more questions.  First, do you have vignetting in the
>corners due to the 72 mm filter?  The diagonal of 6x7 film is
>approximately 90 mm so logic would suggest you would have it.  If
>so, how much?
>
>Thanks,
>
>Wade
>
>
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