Re: [APML] 130EDT ?

[Chris1011@aol.com]

In a message dated 9/3/2001 4:19:10 PM Pacific Daylight Time, 
mirtle.j@home.com writes:


> Also, can anyone comment on vignetting at f8 on 35mm


Vignetting is a function of the camera adapter that you have. Measure the 
smallest opening with T-ring installed. If this opening is smaller than 50mm, 
you will have some vignetting, although it will be very slight. At 42mm 
opening you will begin to see darkening in the corners on fast films, and 
when you do contrast stretching. At 38mm, the corners will start to get dark. 
Below that you will have a circle on the film. 

The 130F8 lens has no inherent limit to the coverage -  with the proper field 
flattener, it could theoretically cover a 4" or larger circle, if there was 
no obstruction between the lens and the film plane. It is always the 
obstructions near the film plane that cause vignetting. For 35mm photography, 
you probably don't need a field flattener for good results with that lens.

Roland Christen