For the web, any macro lens should do. Better yet, digicam. What size are the diamonds? say, X inches. So it should be 10*X inches on the screen. A typical screen has circa 75 dpi, which means the diamond should be 750*X pixels. A 1:4 macro will be 0.25*X on the film, and scan with 3000dpi will give exactly 0.25*X * 3000 = 750*X pixels. However, it'd probably be better to keep away from scanner resolution limits, so 1:2 or 1:1 macro lens should be a safe bet.
Mishka >Can anyone help this customer: > ><<Hi, > >I have been on the internet for hours and I have no hair left!! I want to >phoograph diamonds for a web site. They need to appear on the site abot 10 times >real size. I bought a 3+ filter but this was a waste of time and money. I got >myself a camera book (I am a photo novice) and it would appear the only way I >am going to get quality macro images is with a macro lense. I have a Pentax >MZ30 and can not afford anything like ё500 for a new Pentax Macro Lens. Being a >novice the auto features of any lense are important. From the book I read. >Taking Macro images of a diamond will require maximum depth of field so I need an >apeture priority compatible lens (does this make sense?). > >Any help you can give would be wonderful and restore my faith in the internet. > >Thanks > >Hayley>> > >Post your replies here and I will forward to her (?). Since I know nothing >about file sizes for the web. > >Kind regards > >Peter
