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Author Topic : 5 Simple pictures that show why 100m focal length is best 
filmphoto

Thread Starter / Photographer
City: Cheltenham
Country: United Kingdom
Member Since: Apr 30, 2005
Posts: 2030
Views : 1715  Feb 4, 2015 4:47am



This shot is taken with a 105mm Focal Length.  everything is in correct proportion.   The model looks perfect.   Now look what happens as we zoom out and get shorter and shorter focal lengths.



70mm is just about OK, but we’re starting to see some distortion creeping in.


50mm is NOT OKAY.  The figure is getting more and more distorted – and we are starting to get more of the edges of background appear.



And when we get to 24mm you can see the whole thing has really gone to pot.  This is not a normal, well proportion woman any more.



Compare them side by side – the 105mm is on the left, the 50mm is on the right.   See the difference, she’s squashed in all sorts of weird ways!

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 NoNoizePhotography



Photographer
City: Croydon
Country: United Kingdom
Member Since: Aug 19, 2006
Posts: 1109

Good post, I sometimes use 100MM for portraits depending on the models face shape, but 100MM for single length shots are bang on

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gwentman

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City: Caerphilly
Country: United Kingdom
Member Since: Oct 16, 2006
Posts: 400

Is it only now that you've realised this?
It's been known and written about in text books for years and years and is basic photographic practise.
Emphasising breasts in porno pics is one use of this distortion (erm so I'm told 8-D).

Mike.

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Woods_Photography

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City: London
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Member Since: Nov 25, 2011
Posts: 251

Thank you filmphoto for your series on photography, very helpful.

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 NickG



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City: Ealing
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Member Since: Aug 16, 2004
Posts: 2600

I'll give that a PhotoJoe

+1

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DMGPhotography

Photographer
City: Croydon
Country: United Kingdom
Member Since: Apr 13, 2004
Posts: 1012

It's why the 90mm and 105mm lenses are, or were, known as portrait lenses. Coincidentally, someone posted on one of the photography groups on Facebook today, asking if a 35mm was a great lens for portraits. Hopefully, I put them straight.

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 Ace



Photographer
City: Reading
Country: United Kingdom
Member Since: Apr 12, 2006
Posts: 6203

Thanks for this Filmphoto and please keep them coming. Your mini tutorials are great for newcomers and good revision for old campaigners.

As constructive critique, the side by side comparison images were easier to compare and worked better for me. If the images of the model were edited so that she was the same height, I wonder if the distortion would be even easier to compare? An overlay image would be interesting.

I look forward to seeing more in this series.



Ace, Ace baby! on www.acestudios.co.uk

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gwentman

Photographer
City: Caerphilly
Country: United Kingdom
Member Since: Oct 16, 2006
Posts: 400



Re: Red Baron

It's quiet everywhere sunshine and quoting a 100metre focal length doesn't help his argument.
You may think I'm being negative but read the thread on PP and see how he fares on there as to camera height and comparisons.
Else carry on with the "good" work.

Mike.

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Top  IP: Logged | Edited by gwentman at 02-05-2015 11:42 AM Report Post Reply Reply w/Quote
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