selective focus with the mamiya rf's

[Pherdinand]

I have a question:

Knowing the rather limited speed in the medium format lenses (f/3.5+ for the mamiya 6 and 7's) combined with the wide(ish) angle like 50 to 80 mm and the fact you can't really focus close with these systems - i wonder if you really cvan have selective focus with a mamiya 6 or 7 system. Meaning thin enough DOF.
I'm not talking about using the 150mm lens, but more the wide to normal ones.

Examples would be welcome too. :)
thanks

[Todd.Hanz]

I do allright at f4:

Mamiya 7II, 80/4
http://my-expressions.com/up_media/1108/pblog/7438/1172032521.jpg

http://farm1.static.flickr.com/154/354503662_11a3ae1946_o.jpg

http://farm1.static.flickr.com/128/357582128_9ed513d54a_o.jpg

Todd

[rogue_designer]

because of the larger negative size, that f3.5 or f4, really acts like f2-ish on a 35mm camera from a DOF perspective

DOF calculator
http://www.dofmaster.com/dofjs.html

[Todd.Hanz]

because of the larger negative size, that f3.5 or f4, really acts like f2-ish on a 35mm camera from a DOF perspective

DOF calculator
http://www.dofmaster.com/dofjs.html


...and the closer you get, the shallower the DOF.

Todd

[Finder]

because of the larger negative size, that f3.5 or f4, really acts like f2-ish on a 35mm camera from a DOF perspective

DOF calculator
http://www.dofmaster.com/dofjs.html

Maybe it is the longer focal lengths?

[Pherdinand]

yes but that's the point, with these lenses you can't get very close, unlike with many MF SLR lenses e.g..

Also, the bigger neg means smaller magnification too, that compensates a bit for the reduced DOF, i mean the same blurry things seem less blurry at a lower magnification of a 6x6 neg...

thanks

[Finder]

yes but that's the point, with these lenses you can't get very close, unlike with many MF SLR lenses e.g..

Also, the bigger neg means smaller magnification too, that compensates a bit for the reduced DOF, i mean the same blurry things seem less blurry at a lower magnification of a 6x6 neg...

thanks

Magnification does not change with format. With a given FOV and aperture, the larger the format, the shallower the DOF.

[Mackinaw]

Well, my old Mamiya 6 folder hardly qualifies as new (this is the early 1950's variety) but it still takes good pics. Here's a pic I took a few days back from the deck of the Queen Mary which is currently moored at a dock in Long Beach, California. Taken on Ilford Delta 100 film in Rodinal, F4.0 @ 1/50th or so. Shows the shallow depth-of-field rather well I should say.

Jim Bielecki

[Pherdinand]

Magnification does not change with format.

What i was meaning, a 30x30 cm print is magnified only less than 6x from a nominal 6x6 negative, while if you use 35mm film (2.4x2.4) it is over 11x magnified.

[iml]

Narrow DOF is certainly no problem with my 3.5 Rollei, I use it that way almost exclusively. DOF is narrower at all apertures than with 35mm, IME.

http://www.adweb.co.uk/ian/photography/Hastings7/Images/img721.jpg

http://www.adweb.co.uk/ian/photography/Hastings7/Images/img723.jpg

Ian