2011/1/13 P. J. Alling <[email protected]>: > Actually the diagonal AOV of an 80mm lens on 6cm x 6cm sensor is more or > less the equivalent of the 43mm lens on 35mm film actually a little shorter. > If you look at most fixed lens cameras that rule holds, the lens. unless > you're looking at a specialized camera with a fixed wide angle or telephoto, > you'll find that the focal length of the lens is equal to the diagonal of > the film used to capture the image. > The only major class of cameras that consistently ignores that the standard > is 35mm where the traditional normal lens is slightly telephoto.
Thanks for pointing this out. I know about normal lens being diagonal of the format but I didn't even think about doing the math. So I never noticed that indeed, 24x36 is the only format being slightly tele. I thought it was more a guide line like diagonal plus or minus 10mm or something. > If there;s a special presence I think it's from the size of the view finder. > "Quantity has it's own quality", I think applies in this case. > > On 1/11/2011 3:18 PM, Thibouille wrote: >> >> Interesting thoughts Boris. >> But I never saw that effect with a 50mm on 'FF' or 30-35mm on APS-C. >> Viewfinder/lens may very well be the 'culprit'. Or lack of 31/43 Limited >> :) :) >> I really don't think this is a DOF issue. After all, my FA50/1.4 has >> less [email protected] than the 80/2.8 on 6x6. >> >> The problem is the following, my (very basic) enlarger is 24x36 only. >> No 6x6 prints at home. No way to check until I can afford a proper >> enlarger (which ideally would do up to 4"x5") which won't be tomorrow >> or the day after :( >> >> >> 2011/1/11 Boris Liberman<[email protected]>: >>> >>> On 1/7/2011 3:54 PM, Thibouille wrote: >>>> >>>> ...with some lenses (Pentax of course). >>>> I know this has been debated quite much and that it is somewhat weird >>>> to talk about 3D in a photograph but... >>>> man, my C330 does throw at me exactly that in its waist level finder >>>> and 80mm/2.8 lens. >>>> >>>> Is that the lens? The finder? Medium format DOF ? >>>> I'm surprised and... impressed ! >>>> >>> I think that 3D look has to do with specifics of how we psychologically >>> perceive images. My understanding is that on 6x6 camera 80 mm lens has >>> approximately the same angle of view as 50 mm lens on 35 mm camera - >>> normal. >>> It also occurs to me that may be MF viewfinders are just right in a sense >>> of >>> how large/small they are. I remember distinctly the same feeling of >>> surprise >>> looking through Jostein's Pentax 645 camera - the striking sense of >>> presence, as if being inside the scene. Another thing to consider is >>> tonality and OOF. If there is a smooth transition between dark and light >>> and >>> sharp and not sharp, it probably looks more real. It is because the eye >>> would adjust itself according to the specific small area in the scene at >>> which it is staring and it would basically feel "normal". Smaller cameras >>> and hence wider lenses (for purpose of similar angle of view) would have >>> this "everything is sharp" kind of perception, although its degree would >>> differ from camera to camera and from lens to lens. >>> >>> I would be curious to know if the 3D feel is retained in the prints that >>> you >>> evidently make, Thibs. >>> >>> Hope I make minimal sense. >>> >>> Boris >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >>> >> >> > > > -- > Where's the Kaboom? There was supposed to be an Earth-shattering Kaboom! > > --Marvin the Martian. > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- Thibault Massart aka Thibouille/Thibs ---------------------- Photo: K-7, Sigma 28/1.8 macro, FA50/1.4, DA40Ltd, K30/2.8, DA16-45, DA50-135, DA50-200, 360FGZ ... Laptop: Macbook 13" Unibody SnowLeo/Win7 Programing: Delphi 2009 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
