Quote:
Originally Posted by anj026
For professional achromats 100-150 years ago it is traditional for them to be f15 or thereabouts. I think there is a benefit in the long focal ratios in terms of depth of focus. For a more detailed analysis please have a look at this link to Neil English's article.
http://www.cloudynights.com/page/art...-fiction-r2452 |
The Neil English article resolves many questions re: Classic Achro's. Great thread, great article. Cheers