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General photography questions and answers: Discuss Macro photograpy math...In the macro Gallery I posted a few Pics. of a 5$ bill I took. My question is this. I ...
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Old 11-02-2011, 11:49   #1 (permalink)
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Question Macro photograpy math

In the macro Gallery I posted a few Pics. of a 5$ bill I took. My question is this. I was wondering what the magnifacation would be with the following numbers. I know there's a formula out there but don't know it. This is going to be a hard one. I know one of you macro photographers out there can figure this out.I used a 300mm lense with 68mm of extenion tube and a raynox 2.5x magnafier at a focal distance of 6” on a D-90 nikon with a 1.5x crop facter. How many times magnifacation does it end up at? Just curious. P.S. If you could post the formula that would be really cool. Thanks
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Old 11-02-2011, 15:43   #2 (permalink)
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Re: Macro photograpy math

Wow Stevedias,

really heavy for a Friday afternoon. Let me drink my Chardonny and think awhile, once i've had three or four, I shall attempt to answer this.

Mims
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Old 11-02-2011, 16:54   #3 (permalink)
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Re: Macro photograpy math

IIRC, the tubes and lens input is tubes/focal length: (1 + 68/300) which works out just under 1.23

so 1.23 x 2.5 x 1.6 = 4.92

So my guess is approx 5x
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Old 11-02-2011, 18:00   #4 (permalink)
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Re: Macro photograpy math

Thank you Markulous: I wrote that formula down for future ref. I'm dot quite sure where the (1) came from though. It's not a 1:1 macro lense. It's a 70-300 zoomed all the way out , but 5 times sounds really good. Being a beginer at macro photography is that a good magnifacation or not? I can't wait till spring, when all the little bugs come out.
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Old 11-02-2011, 21:13   #5 (permalink)
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Re: Macro photograpy math

5x is pretty good - I've a lens, the MP-e 65mm that will only do macro and that is 1-5x.

You'll find the DOF is very shallow at those magnifications - good candidates for focus stacking
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Old 13-02-2011, 09:53   #6 (permalink)
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Re: Macro photograpy math

This chap has a very useful spreadsheet for you to download, which provides more information than I can imagine wanting: Macro lens calculations
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Old 14-02-2011, 13:25   #7 (permalink)
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Re: Macro photograpy math

Thank you for that link Sejanus: Thats alot of crazy math I'll have to digest , and I'm a toolmaker that deals with triganomitry and algabra all the time. I'll have to explore that site and its links and study up. I knew people here could help me. Thanks again.

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Old 14-02-2011, 13:30   #8 (permalink)
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Re: Macro photograpy math

I've just heard about focus stacking reasently, and started to check out a few sites dealing with that. I'm very intreged. sounds like alot of work, but I've seen alot of amazing pictures.
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Old 14-02-2011, 15:12   #9 (permalink)
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Re: Macro photograpy math

Just the thread I wanted to see.. now I am about to start macro... and bought the Nikkor 105 EDvr recently, posted some test shots in the macro thread. I know its a difficult sub.... I would appreciate some general help to begin with. One thing I came across is the difficulty to focus on the sub.. I have expected the paradox between the DOF and the light but not this....
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Old 23-02-2011, 18:46   #10 (permalink)
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Re: Macro photograpy math

How about taking a picture of a ruler
Would that be of use.
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Old 24-02-2011, 16:08   #11 (permalink)
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Re: Macro photograpy math

The best possible way to understand depth of field, Richard. Photograph the ruler at as close to 45 degrees as you can manage and some simple arithmetic will give you the exact depth of field. Use a second ruler to measure from the "film" plane to the focus point and you have everything you need.
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Old 24-02-2011, 17:21   #12 (permalink)
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Re: Macro photograpy math

Quote:
Originally Posted by Markulous View Post
5x is pretty good - I've a lens, the MP-e 65mm that will only do macro and that is 1-5x.

You'll find the DOF is very shallow at those magnifications - good candidates for focus stacking
Which Nikon would do something like this
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Old 25-02-2011, 06:30   #13 (permalink)
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Re: Macro photograpy math

Quote:
Originally Posted by simpbow View Post
Which Nikon would do something like this
Not too sure if Nikon have the equivalent - think you'd have to use tubes/bellows
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Old 05-03-2011, 18:30   #14 (permalink)
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Re: Macro photograpy math

Easier way than doing loads of heavy maths is to photograph the ruler at closest focal point with the ruler completely parallel to the sensor plane so that it is all fully sharp and the measurement scale is accurate (it won't be if you angle it!)

When you have taken the shot, work out the size of one centimetre relative to the width of the photograph and then relate that to the size of your sensor. If it is measuring more than one centimetre then you have true 1:1 plus macro. If it is less than a centimetre then it is less than life-sized and not true macro. If your one centimetre measures 2 centimetres then you have 2:1 which is double life-sized macro etc.

To make it clear, if you look at the 1 cm and it is over a quarter of the total width of the picture then that would be life-sized on a full-frame sensor which is 36mm wide as a quarter of that would be 9mm.

I'll leave you to do the maths as trigonometry and algebra were never my strong point LOL.

Cheers,
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