Pixel Perfect wrote:
The larger glass will certainly help minimise vignetting wide open, it's collecting more light from highly skew rays.
I would never use a filter on this sort of lens however, so the cost of such large filters never worries me. I'd prefer a rear mounted one like in the superteles.
---------------------------------------------
EB-1 wrote:
The minimum front element size would be about 95 mm to achive f/6.3 at 600 mm. That does not mean a 600 mm lens with 105 mm front glass has an aperture of less than f/6.3.
For example, the first 80-200/2.8 Nikkor had a 95 mm filter.
