Re: 140/155 4” Field Flatteners


Yep, the 67 flatteners that came with my 155 f/7 and 180 f/7 create a lovely 100mm image circle with minimum vignetting and great sharpness across the entire circle.  
A large array for that full coverage will be quite expensive, not to mention the cost of narrowband filters.   Smaller arrays work just fine for mosaics at a fraction of the cost.  Just say'n.   Oh and don't forget the PC requirements to handle stacks and stacks of 150 mp files.  

- jg

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