I would think that a macro lens closed down to f45 would create a lot of
diffraction effects.
Aydin
snailstales.blogspot.com
On Tue, 25 Nov 2008 10:05:28 -0500, Paul Callomon <[log in to unmask]> wrote:
>My ten cents:
>
>I have been able to get fairly good photographs by using a Wild
>microscope (either an M5 or an M6) with the optional diaphragm section.
>The latter can be bought separately, and adds a diaphragm to the column
>(both sides). If you focus with it open and then shut it down to about
>2.5, you get the same depth of field as a macro lens at f32. The camera
>is a Nikon digital SLR (6.1 MPx), attached to one of the eyepieces using
>an adaptor purchased from Edmund Optical in New Jersey. This compensates
>for eyepiece magnification, and has a standard Leica screw mount that
>can be customized for any camera using adaptor rings.
>Lighting can be by ringlight, light pipes or by a regular strobe on one
>side of the microscope with a handheld mirror on the other to vary
>shadowing.
>The only problem with this setup, apart from the cost of the eyepiece
>adaptor, is a certain amount of purple/yellow halation on edges; this is
>partly because the light path is going through a prism, and partly
>because each pixel is approaching the size of the optical Circle of
>Interference. A finer CCD, like a 10 MPx or so, might improve things. On
>the other hand, if you already own or have access to an M5 or M6, this
>is a relatively cheap way to get good micro pictures.
>
>I recently obtained a rare Mk1 Medi-nikkor lens from about 1975 - 3 x
>macro, built-in strobe and a diaphragm that goes to f45! It's fabulous,
>and gives great color pictures of things down to about 0.5 mm diameter.
>I've been using it for protoconch and periostracum pictures, with good
>results.
>
>Regards,
>
>
>
>Paul Callomon
>Collections Manager
>Malacology, Invertebrate Paleontology and General Invertebrates
>Department of Malacology
>Academy of Natural Sciences
>1900 Parkway, Philadelphia PA 19103-1195, USA
>Tel 215-405-5096
>Fax 215-299-1170
>Secretary, American Malacological Society
>On the web at www.malacological.org
>
>>>> Marcus Coltro <[log in to unmask]> 11/25/2008 7:42 AM >>>
>No, it is not for sale here, only in USA, UK and Japan... and it is
>"kinda" heavy to carry around,
>63 kilos! (140 pounds)
>
>Anyway, I would like to hear if these others produce good quality
>pictures. It is hard to get decent
>depth of field using regular microscopes - even with the software as
>there is not much space for
>take different levels of focus
>
>Marcus
>
>________________________________________
>De: Conchologists List [mailto:[log in to unmask]] Em nome de
>Wiggers
>Enviada em: terça-feira, 25 de novembro de 2008 10:08
>Para: [log in to unmask]
>Assunto: Re: [CONCH-L] Digital Microscope
>
>Uau! I liked those "toys"! Unfortunately it is not possible to find
>those here in Brazil (is it
>Marcus???).
>Hope Santa brings me one for Christmas this year... :)
>
>Regards
>Fabio W.
>
>
>--- Em seg, 24/11/08, Eddy WILMET <[log in to unmask]> escreveu:
>De: Eddy WILMET <[log in to unmask]>
>Assunto: Re: [CONCH-L] Digital Microscope
>Para: [log in to unmask]
>Data: Segunda-feira, 24 de Novembro de 2008, 22:54
>Hi Bill in fact this is the one I was talking about (paste this
>commandline):
>
>http://www.virtuavia.eu/shop/index.php?
>target=products&product_id=29887&sl=EN
>
>Regards,
>
>Eddy
> WILMET
>www.euromurex.be
>
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