Anyone knows Rikenon P Zoom Lens?
in [35mm]
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From: Steven Woody on 5 May 2007 00:45 it was marked as Ricoh Rikenon P Zoom 1:3.4-4.5 35-70mm MACRO. how to use it's macro feature? it gets a green 'macro' mark on the focus scale, and a 'P' stop on the most left end of aperture scale. i don't know what these mean. thanks. - woody
From: Pudentame on 5 May 2007 05:06 Steven Woody wrote: > it was marked as Ricoh Rikenon P Zoom 1:3.4-4.5 35-70mm MACRO. how to > use it's macro feature? it gets a green 'macro' mark on the focus > scale, and a 'P' stop on the most left end of aperture scale. i don't > know what these mean. > > thanks. > > - > woody > It's macro when it's at it's closest focus. The 'P' at the left of the aperture scale is for "program" mode cameras. Since, IIRC, Ricoh used the Pentax K-bayonet, it's similar to the 'A' setting on Pentax lenses. With the lens in the 'P' (or 'A') position, the camera selects the aperture.
From: Steven Woody on 5 May 2007 07:49 On 5ÔÂ5ÈÕ, ÏÂÎç5ʱ06·Ö, Pudentame <no....(a)no.were.invalid> wrote: > Steven Woody wrote: > > it was marked as Ricoh Rikenon P Zoom 1:3.4-4.5 35-70mm MACRO. how to > > use it's macro feature? it gets a green 'macro' mark on the focus > > scale, and a 'P' stop on the most left end of aperture scale. i don't > > know what these mean. > > > thanks. > > > - > > woody > > It's macro when it's at it's closest focus. but closet distance is merely 0.35m, can this distance be regarded as macro? > > The 'P' at the left of the aperture scale is for "program" mode cameras. > Since, IIRC, Ricoh used the Pentax K-bayonet, it's similar to the 'A' > setting on Pentax lenses. With the lens in the 'P' (or 'A') position, > the camera selects the aperture. thank you. i understand. - woody
From: Alan Browne on 5 May 2007 10:44 Steven Woody wrote: > On 5��5��, ����5ʱ06��, Pudentame <no....(a)no.were.invalid> wrote: > >>It's macro when it's at it's closest focus. > > > but closet distance is merely 0.35m, can this distance be regarded as > macro? What defines "macro" is not closest focus but image size on the film/sensor. If the reproduction size on film is 1:1 it is the "common" definition of macro. At 1:1, a 4mm long grain of rice will form an image 4mm long on the film (or sensor). From there, if you make an 8X enlargement, then the rice grain will be 32mm long on the print. (an 8x enlargement would be about 11.3 inches wide). I differ from Pudentame's reply in that you do not _have_ to be at closest focus for a macro image, but that is of course the largest reproduction-image on film you will get. In photographing small objects, some focus range is required unless you have an awful lot of time available to move your tripod in and out to achieve 1:1 all of the time. Some macro lenses like the Minolta 1-3x and Canon 1-5x go beyond 1:1 to 3:1 and 5:1 respectively. You could call these "micro's", albeit limited. 1:2 is usually "accepted" as macro for 35mm. Up to 1:4 is accepted for MF and other larger format films (eg: the 4mm long grain of rice makes a 1mm image on the film. Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch.
From: Alan Browne on 5 May 2007 10:47 Alan Browne wrote: > reproduction-image on film you will get. In photographing small > objects, some focus range is required unless you have an awful lot of > time available to move your tripod in and out to achieve 1:1 all of the > time. I should have added to the above, that there are tripod heads that allow the lens to be left focused at 1:1 (or whatever FP is desired) and the whole camera is moved in or out relative to the subject to achieve focus. If you do a lot of macro then this is a recommended investment. -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: Remove FreeLunch.
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