On 14 Aug 2004 at 11:45, David Nelson wrote: > G'day all, > More of a 'technical' PAW than enything else, but an interesting image > (IMO) captured with a rather different technique. > > http://davidavid.whatsbeef.net/eyes.jpg
> The obvious deficiency of the photo is the extremely limited DOF. I > believe that this is unavoidable at this sort of magnification (at least > with this primitive setup). I also noticed that stopping down the 50mm > more resulted in funny rainbow-like starbursts in OOF highlights. > Diffraction? Interesting set-up, I've oly ever reversed lenses years back, I found it all a little too cobbled to be a usable set-up for me. It seems you did get in a fair way though. Is the image a 1:1 crop or a crop and reduction? > I had a quick go at taking several slices with the intention to stitch > them for a big DOF, but ran into some difficulties (allignment, getting > the right bit in focus, moving the whole setup). No good results, but > it's promising. After looking again at Hans's Crab spider image I decided I'd do a little experimenting on a subject you know too well :-) I shot the image at four planes at only f5.6 and whilst it wasn't very high mag and the background was plain I can appreciate the advantages the technique can provide, it took very little time too (it was a Q&D attempt however). I did however adjust focus on the lens and even over the very small distance there was an appreciable magnification difference between the near and far images. Macro rails are really the only realistic way to make the technique work effectively. http://members.ozemail.com.au/~audiob/temp/_igp5695m.jpg Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
