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Old 16-11-2008, 21:34   #1 (permalink)
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A couple of classic questions from a newbee

Hi there!

I'm new to this community but I'm sure that you can help me with these long time unanswered questions. It's again about 35mm format lens with APS size sensors...

Namely, given a certain focal lenght:-

1) Does its typical DOF vary from one format to the other?

2) Beside the cropping effect, what about its typical perspective? (i.e. a 50mm lens becomes a true "portrait" lens, with the flattening effect in line with the "increased" focal length?)

Thanks to you all in advance.
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Old 16-11-2008, 23:10   #2 (permalink)
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Re: A couple of classic questions from a newbee

These are clever questions for someone who calls themselves a noob

1) Yes, typically 35mm gives a shallower (and more sought after!) DOF (more or less)
2) The angle of view changes, so yes a little bit but unless the crop factor is huge (think four thirds), it's not going to be that different, what you will notice is the focal length change (obviously)

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Old 21-11-2008, 21:50   #3 (permalink)
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Re: A couple of classic questions from a newbee

Thanks I am interested in portrait photography and needed a support to understand if it's worth to save my bucks for the new Nikon 50mm f/1.4.

Actually I have 50, 60, 85 and 105 mm lens but still have not found the best to suite the APS size sensor of my digital reflex. They are too short or too long and the bokeh is poor compared to the results with 35mm film.
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Old 21-11-2008, 22:22   #4 (permalink)
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Re: A couple of classic questions from a newbee

Maybe your problems lie more with your studio set up rather than your lenses. Home studios will usually be tight on space - particularly behind the model.

You might be better trying a different set up rather than just throwing cash at new gear.

I've always thought that the ideal focal length for portraits is between 75-105 in 35mm - so digital 60-80 is in that zone.

I've seen on TV pro studio shoots where they use 200/300mm f2.8 lenses - but their studios are the size of warehouses and the set is probably at least 6 metres in front of the background.
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Old 21-11-2008, 22:59   #5 (permalink)
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Re: A couple of classic questions from a newbee

Near enough Graham.In the old days of 35mm SLR single prime lens for portraiture favoured 85mm
or 135mm .The 135 was especially nice for the perspective and small depth of field

Last edited by brian wright22; 22-11-2008 at 09:53.
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Old 22-11-2008, 16:38   #6 (permalink)
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Re: A couple of classic questions from a newbee

Hello & Thanks to You all.

I guess some clarifications are due.
I said I'm interested in portaraiture but I like nearly candid shots rather than posed takes.
My home set (after some duelling with single and multiple strobe lights) is limited to natural dining room window light and the widest lens aperture - f/2.8, f/1.8 - to mitigate the obvious distractions of a standard living area.

I know that in the 35mm format, lenses with focal lengths 85 up to 135mm are recognised as "portrait" lenses and this would lead to 50-60mm to 85mm lenses for APS sensors with multiplying factors 1.5/1.6. However, my feeling is that 50-60mm lenses still maintain a noticeable disotortion in a typical "head & shoulder" portratit where longer focal lengths - 85mm or more - add too much "telephoto effect" i.e. grabbed image.

At the end I am trying to understand if it's either just my feeling or the true optics law (which I know very little).

Maybe APS sensors are not suited for portaraits at all.
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Old 22-11-2008, 19:24   #7 (permalink)
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Re: A couple of classic questions from a newbee

Quote:
Originally Posted by Stefano_TT View Post
Hello & Thanks to You all.

Maybe APS sensors are not suited for portaraits at all.

Yes I think so.All of my APS only lens produce more distortion than any of my 35mm ones. That is ovet 28mm.

My best portrait shots have been with a 70-300mm digital only aps lens.Setting this to about 200mm gave great shots with minimum distortion.
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