Olympus UK E-System User Group
Olympus UK E-System User Group

Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


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Looking for improvement This is the e-group critique board. If you post a picture here it will be assumed that you are looking for comprehensive technical feedback - both good and bad, but always respectful. Only post pictures here if you can deal with potentially negative constructive criticism. Anyone is qualified to comment and post feedback, and everyone is encouraged to do so. NB: "Looking for Improvement" is the place to post any pictures you would like advice on improving, no matter how bad you might think they are.

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  #16  
Old 6th December 2011
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StephenL StephenL is offline
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Re: Stacked macro photos of wasp’s head

Seriously complicated sums! Makes my little brain hurt just thinking about it!

As an aside, I presume that even if one were to try focus-stacking on a more conventional, non-macro subject, it would be difficult using focus-by-wire lenses, and this is where legacy or pure mechanical lenses come into their own.
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  #17  
Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

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Originally Posted by StephenL View Post
As an aside, I presume that even if one were to try focus-stacking on a more conventional, non-macro subject, it would be difficult using focus-by-wire lenses, and this is where legacy or pure mechanical lenses come into their own.
Interesting question Stephen, and one I don’t really know the answer to.

I am very new to stacking and there seems to quite a bit of high spec – high tech kit being developed and used by others to take absolutely stunning images. See http://www.cognisys-inc.com/HowTo/fo...ack_how_to.php and http://www.heliconsoft.com/focus_articles.html

My reasoning behind the use of the OM 50mm lens was only that it fitted into the auto bellows. I don’t know if there is a modern equivalent of the auto bellows which would let the camera body control the focussing and aperture of a digital lens.

Presumably if you were to use focus-by-wire lenses, provided that you managed to get your stack of images to capture the area you needed to be in focus, then the software would assemble the stacked image.

Throwing the question open to forum … any thoughts
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  #18  
Old 6th December 2011
Jim Ford Jim Ford is offline
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Re: Stacked macro photos of wasp’s head

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Jim, I am very interested to see your setup – sounds very good. Any thoughts on which software you will use for stacking?
With the prototype I made I used CombineZM which seemed to work OK:

http://hadleyweb.pwp.blueyonder.co.uk/CZM/News.htm

Jim
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  #19  
Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

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Originally Posted by StephenL View Post
As an aside, I presume that even if one were to try focus-stacking on a more conventional, non-macro subject, it would be difficult using focus-by-wire lenses, and this is where legacy or pure mechanical lenses come into their own.
There's no problem with the digital Zuikos. I just use the camera in manual focus and focus on the front of the image using LV. The first step is 1/2 the DOF, because the DOF extends either side of the plane on which the lens is focussed. The rail then automatically steps and takes shots until it gets to the furthest point of the object.

This is a good site for close-up and macro photography:

http://savazzi.freehostia.com/photog...hotography.htm

I used the DOF formulae on this page, which also has a useful DOF table.:

http://savazzi.freehostia.com/photography/macrodof.htm

This is a particularly interesting (and surprising) quote from the page:

"While the focal length does have have an effect on DOF at very low magnifications, its effect steadily decreases as magnification increases, and DOF becomes the same, regardless of focal length, at 1x."

Enrico Savazzi seems pretty 'clued up' on macro photography. If you want to buy his book, it's £99.30 (paperback)!

Jim
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Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

Terrific image - congratulations.

I've just bought an old Cosina focussing rack off ebay to have a go at this technique, but reading this makes me wonder if it's possible to rack manually to get sufficient accuracy - anyone else had any experience of this?

Interestingly I read an article somewhere recently reporting that research had shown that wasps all have different faces and that the members of a particular colony have the ability to recognise those faces and attack any that they don't recognise. Amazing.

Martin
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Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

That needs to be considered for the Oly book...taking late entries Ian?
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Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

It's a terrific shot that started this really interesting thread. Must work out how I can have a go too. Looks like lots of time in the garage is called for
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  #23  
Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

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Terrific image - congratulations

I've just bought an old Cosina focussing rack off ebay to have a go at this technique, but reading this makes me wonder if it's possible to rack manually to get sufficient accuracy - anyone else had any experience of this?
Thanks Martin.

There is no reason why you should not be able to manually move the rack – I move mine manually, the digital scale is just for convenience and was something I had spare in my workshop.

Assuming you knew how far the rack travels for one rotation of the positioning knob you can rig up a Heath Robinson indicator using a protractor.

For example, using the Olympus Auto Bellows, the travel per rotation is 1 inch (25.4mm). Using a protractor as a scale:

1 degree of rotation (1 inch / 360°) would equate to a travel of just 0.0027 inches (0.07mm), or about the thickness of a piece of paper.

In theory, 0.0027 inches of travel would mean you could produce stacks at a Magnification of about 8.65

For the photo of my wasps face the Magnification of was about 1.82.

Give it a go
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  #24  
Old 6th December 2011
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Re: Stacked macro photos of wasp’s head

I just find this whole thing fascinating

Steve
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  #25  
Old 7th December 2011
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Re: Stacked macro photos of wasp’s head

Impressive image!

That reminds me, I have a Pentacon Bellows unit (M42)....
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  #26  
Old 7th December 2011
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Re: Stacked macro photos of wasp’s head

Quote:
Originally Posted by Swordfish View Post
I've just bought an old Cosina focussing rack off ebay to have a go at this technique, but reading this makes me wonder if it's possible to rack manually to get sufficient accuracy - anyone else had any experience of this?
A lot of people have good results from doing it manually and taking care.

Jim
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  #27  
Old 20th December 2011
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Re: Stacked macro photos of wasp’s head

This is absolutley fascinating. A stunning image using a technique which I find myself rather excited about ( sad old buzzard that I am ). Got to look into this.

Many thanks for posting what I can honestly say is an inspirational shot.

cheers

Hec
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