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Old Feb 8, 2011, 4:20 PM   #1
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Default Depth of Field & Zoom in use

G'day all

There are other postings on the Forum regarding DoF and how-do-I-get-it? type of questions

With our fixed-lens zoom cameras, we do not have the small f-numbers that the dSLR people have on their cameras.
To overcome this as best I can, I use the zoom lens and camera location-to-the-subject as best as I can

So here's how I do it - Hope it helps you too

Images 1- & 2-
Each shot at 1x zoom AND the subject is so close to the camera I can touch it. To get this type of image, I am lying on the ground
In image 1- the stones in the water are about 14cm [6 inches] from the camera and in about 5cm [2 inches] of water.
In image 2- the stone in the front-right was about the size of a matchbox and was about 7-10cm [3-4 inches] in front of the camera




Images 3- & 4-
Each was shot at about 10x-12x zoom.
Camera to subject distance was 4-6 metres so I had to back away from the subject but I knew that the long zoom in use would make the background go fuzzy



Hope this helps
Regards, Phil
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Old Feb 8, 2011, 4:42 PM   #2
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Very nicely done. Thanks for sharing.
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Old Feb 9, 2011, 8:33 AM   #3
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Can you explain this to me again ? I don't get it...

You mean to say you achieved those results with a P&S ?
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Old Feb 9, 2011, 3:55 PM   #4
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G'day Marawder

Can you give me a bit more to work with so that I can give you the best answer - and perhaps some images of how it's done

Regards, Phil
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Old Feb 10, 2011, 1:08 PM   #5
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Quote:
Originally Posted by Ozzie_Traveller View Post
G'day Marawder

Can you give me a bit more to work with so that I can give you the best answer -
Regards, Phil
Well, Phil...I have a Sony WX5, no manual settings at all !

I tried taking a photo, similar to nr. 4, but the DOF just isn't as shallow as it is in your shot !
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Old Feb 10, 2011, 1:57 PM   #6
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G'day again Marawder

Thank you for a) trying and b) telling me what camera/lens system you have got

I am using a Panny FZ35 - and while is has a 'big' zoom, I see that your Sony has a 5x zoom lens

Over the weekend I will set the Panny to 5x zoom and see what I can create: I will then post the results with details so that you can do it yourself

Regards, Phil
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Old Feb 10, 2011, 3:01 PM   #7
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Quote:
Originally Posted by Ozzie_Traveller View Post
Over the weekend I will set the Panny to 5x zoom and see what I can create: I will then post the results with details so that you can do it yourself

Regards, Phil
Thanks !
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Old Feb 13, 2011, 1:57 PM   #8
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This is the one beef I have with camera makers is removing Manual from the menu...the lack there of is One Reason I will Not buy a camera.
When shooting anything in macro mode, or whatever they call it, keeping the F-stop or aperture to 2.8 or so will tend to keep the background blurred. the higher the number, say 8.0 aperture, the greater depth of field.
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Old Feb 13, 2011, 8:34 PM   #9
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Your pix are beautiful.
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Old Feb 17, 2011, 2:35 PM   #10
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G'day all

G'day Marawder - back again

I have had some fun trying [or should I say some 'trying fun' ] to reproduce my results into a 5x zoom system - with varying results. The small P&S camera I used is very basic compared with my Panny FZ35

I have been playing with using the canon P&S camera lens at 5x zoom then using 2x in-camera digital zoom to bring it up to 10x - and thus compare it with the FZ35 images on 10x zoom. At least that's the theory !!

Attached are various images that may help you

1- the little canon shows its in-camera digital zoom this way...


2- Some foliage (in the rain) from the FZ35 -
distance to foliage = 1,2metres, distance to background = 15m


3- same foliage using the P&S ... note the different background appearance


4- another view of different foliage from the FZ35
distance to foliage = 1metre, distance to background = 8m


5- A similar view via the P&S


Conclusions-
The little canon P&S when zoomed to 5x and then has 2x to 3x digital zoom added can produce some images with a blurry background when everything else can me made to stack up ~ but it's a lot easier with the FZ35 with its longer zoom lens

Hope all this helps in some way
Regards, Phil
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