[LRFlex] Re: [LRFlex]Doug's Close-up pages.

David -

My info and experience has shown that, in the main, tubes definitely are not better.

Supplementary close-up lenses (in the preferred achromatic doublet form) basically re-route the rays from a nearby object so as to make them parallel (at a certain distance) so that your prime lens exhibits the level of aberration correction it normally shows for objects at infinity - much better than tubes in the large majority of cases.

Bob Palmieri




On Mar 23, 2005, at 10:34 AM, Douglas Herr wrote:

David Young <dnr@xxxxxxxxxxxxx> wrote:

I cannot tell the difference between a shot taken
with a good multi-element close-up lens and one taken with extension
tubes.... even though I "know" that the tubes are better.

Ain't nessesarily so... the 90 'cron shows a LOT of field curvature with extension tubes, does MUCH better with an ELPRO.


Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com
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