Re: "affordable" makro lens
(1) Be patient and buy the book before you do anything else. When the book arrives -- you'll probably have to buy from a seller in the US -- read it. Haste makes waste.
(2) When you write "1:5-1:10" do you mean that the image on film will be 1/5 to 1/10 the size of the stone?
(3) How big (length, width, depth) are the stones?
Re: "affordable" makro lens
0-book ordered Dan,thanks!
1-i am patient..:)
2-yes,thats what i ment..that the stone is 1/5 to 1/10 the size of the film(dunno if i sad it right..)
3-lets say:3cm lenght,2cm width,and 2 cm depth.
Thanks Dan!
Re: "affordable" makro lens
Quote:
Originally Posted by
cheezus
2-yes,thats what i ment..that the stone is 1/5 to 1/10 the size of the film(dunno if i sad it right..)
3-lets say:3cm lenght,2cm width,and 2 cm depth.
Oh, dear.
If the image on film is 5 to 10 times as large as the stone then magnification will be 5:1 to 10:1. At these magnifications the effective f/ number -- Lefkowitz explains how to calculate it -- will be 6 to 11 times the f/ number set. In other words, if you shoot at 5:1 at, say, f/16 the effective aperture will be f/96. This has two implications. You'll need bright lights or long exposure. And the diffraction limited resolution at the center of the frame will be ~ 15 lp/mm; it will be lower off axis. You won't be able to capture fine detail. And, yes, depth of field will be very small.
Since your subjects can't move you should look into using digital capture, not film, with focus stacking as Bob Salomon suggested.
Re: "affordable" makro lens
Thanks Dan!
im going to read more,make more experiments,and ask less..
thanks for your time,advice,Dan,and Everyone!
have a nice day!
Re: "affordable" makro lens
Quote:
Originally Posted by
cheezus
Thanks Dan!
im going to read more,make more experiments,and ask less..
thanks for your time,advice,Dan,and Everyone!
have a nice day!
Bear in mind, the depth of field runs from in front of the focus point to behind it. So if you want the greatest depth of field at the aperture you are using in the macro range you need to focus about half way into the area that you want sharp. Otherwise the depth of field in front of the subject isn't doing anything for you.
Re: "affordable" makro lens
Thanks a Lot Bob!
really helpful thought,not gonna forget it!
AlltheBest!
Re: "affordable" makro lens
On a low budget you might look at using a Compon enlarger lens, at one time Schneider sold them mounted in a shutter as Macro lenses. A 135mm Componon will fit a #0 shutter.
Ian
Re: "affordable" makro lens
Got Lester's book today. Very comprehensive and covers macro anything, way easier to read this book than scan the Internet for this info.