|
Re: Basic question on lenses
Yes, partly the mechanics of the lens but even more because of the internal optics that you'd need to eliminate aberrations and edge focusing issues at 18mm f/1.8. Most lenses - especially the less expensive ones - don't perform at their best until stopped down one or two stops from maximum aperture, so wider apertures, even if possible in terms of iris diameter, would give very poor results.
|