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Al G

US
116 posts

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Al G Registered since 17th Nov 2012
Wed 02-Jan-13 11:22 AM

I had seen somewhere a comparison between various macro lenses. I have a Tamrom 90mm but the downside is the barrel extension near 1:1 reduces the front of lens to subject while reducing the aperture from 2.8 to 5.6. The Tamron depth of field is about about 2 mm or so.

What I wanted to see is a net distance from front of lens at 1:1 combined with final aperture with more depth of field to see if there is a better option. The Nikon site just shows the focal plane to subject and does not mention final aperture.

I was sure there was a chart that compared the parameters (final aperture, lens from to subject, depth of field) but cannot find it now.

Al

elec164

US
2252 posts

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#1. "RE: Macro lens comparison" | In response to Reply # 0

elec164 Silver Member Nikonian since 15th Jan 2009
Wed 02-Jan-13 03:09 PM | edited Wed 02-Jan-13 03:14 PM by elec164

There's a link in the pinned 'Macro Photography Tips and Tricks' that has a chart of working distances of most macro lenses. Perhaps that is what you were referring to?

Pete

Edited to add:
As to DOF: with macro distances the standard DOF charts and calculators are not totally accurate and DOF is generally a bit greater than they show. Also with macro the magnification factor determines DOF which makes DOF focal length independent at that point. Or to put it another way, I believe at 1:1 the DOF will be the same whether you use a 50mm or 200mm focal length. The difference being the working distance is greater with the 200mm lens.

Pete

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Snapshott

Richmond, US
416 posts

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#2. "RE: Macro lens comparison" | In response to Reply # 0

Snapshott Silver Member Nikonian since 01st Sep 2007
Wed 02-Jan-13 07:02 PM

Below is a link explaining the decrease in aperture on macro lenses. When reviewing the chart in the link Pete provided keep in mind that the working distance is from the front of the lens. Your Tamron 90mm has a deep recessed front element that I never feel the need to use a lens hood with. For the rest of my macro lenses the front element is not recessed and I always use a lens hood (which decreases working distance by the depth of the hood).


http://www.nikonians.org/forums/dcboard.php?az=show_topic&forum=146&topic_id=13313&mesg_id=13313&page=

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Al G

US
116 posts

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#3. "RE: Macro lens comparison" | In response to Reply # 1

Al G Registered since 17th Nov 2012
Wed 02-Jan-13 09:11 PM

>There's a
>link
>in the pinned 'Macro Photography Tips and Tricks' that has a
>chart of working distances of most macro lenses. Perhaps that
>is what you were referring to?

Thanks. That was the chart I had in mind.

Al

RWCooper

Winnipeg, CA
984 posts

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#4. "RE: Macro lens comparison" | In response to Reply # 0

RWCooper Silver Member Nikonian since 04th Jul 2004
Thu 03-Jan-13 01:49 PM

Hi,

If you want more working room you need a longer focal length. For Example a 200mm macro has more woking distance than a 150mm macro which has more working distance than a 90mm macro. There's nothing you can do about the DOF as that's a function of the magnification assuming a fixed aperture.

Enjoy!

Randy

Tony_Jeffree

Manchester, UK
2016 posts

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#5. "RE: Macro lens comparison" | In response to Reply # 4

Tony_Jeffree Registered since 13th Oct 2004
Fri 25-Jan-13 09:43 AM

>Hi,
>
>If you want more working room you need a longer focal length.
>For Example a 200mm macro has more woking distance than a
>150mm macro which has more working distance than a 90mm macro.
>There's nothing you can do about the DOF as that's a function
>of the magnification assuming a fixed aperture.

Not an infallible rule, as there are examples where going to a shorter FL gives a greater WD...for example, the Tamron 60mm has more WD at 1:1 than the Tamron 90mm...Problem is that there are many variables; some front elements are deeply recessed, others are not, some lenses use internal focusing (focusing by reducing the effective FL of the lens), others focus by extension...etc. All contribute to the differences in the resultant WD that is available.

Regards,
Tony

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G