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Archive 2012 · Flat Field Macro Lens
  
 
Pete Klinger
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p.1 #1 · p.1 #1 · Flat Field Macro Lens


This probably seems like a contradiction, because more often, objects are 3D. I'm trying to get up close to pages and images, in books and make a full frame (with APS-C sensor) image of what would be an 1/8th page or 1/6th page ad.

The larger pages and full page aren't as much of a problem.

I need to get close and in focus, flat field and not distorted.

I tried my 100mm Macro, it's 14" away. Wondering if there's something shorter that someone can suggest that will focus closer, on a small portable copy stand. The 28-135 "macro" is also unsuitable and doesn't get close enough. Canon cameras.

Extension tubes? Close up adapters? Is there a 28mm flat field Macro lens?



Nov 02, 2012 at 04:29 PM
LordV
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p.1 #2 · p.1 #2 · Flat Field Macro Lens


Think the widest common lens I've seen is this Tokina AT X M35 Pro DX Macro lens.
Most macro lenses should have a flat field but not sure how good this one is.
Brian v.



Nov 03, 2012 at 07:28 AM
e6filmuser
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p.1 #3 · p.1 #3 · Flat Field Macro Lens


I don't understand why you think you need to get close.

In general, the longer the focal lens, the less distortion you will get. That is why portrait lenses are longer than standard. As you don't want much DOF you would be even better of with a moderate telephoto.

A potential problem is that modern consumer lenses have some distortion uncorrected in the knowledge that the camera will correct them. Such a lens would have to be used with a suitable camera.

My starting point wouild be a Tamron SP 90mm macro, which covers a field 10cm wide x 7.5cm high at a distance of about 50cm (m4/3 x2 crop factor).

Close working distance options:

The SP 17mm, with 7mm extension will cover 5cm wide with 5cm working distance. It is a rectilinear lens.

http://www.adaptall-2.org/lenses/51B.html

The Olympus OM 24mm 2.8, with 7mm extension, will cover about 4.5cm to 7 wide with 5 to 7cm working distance. It looks very sharp, with the meerest hint of barrel distortion at the very edges of the frame.

All of the above are manual focus film lenses.

I hope some of this helps.

Harold



Nov 03, 2012 at 09:20 AM
aabbabc
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p.1 #4 · p.1 #4 · Flat Field Macro Lens


These photo are taken by Tokina AT X M35 Pro DX



100% crop


100% crop right bottom corner


hope these help



Nov 05, 2012 at 07:53 AM
 

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Pete Klinger
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p.1 #5 · p.1 #5 · Flat Field Macro Lens


Thanks for the tips. Part of the reason for close, is the size of the copy stand arm. These are antique book illustrations, so absolutely flat, I don't need to worry about depth of field.

I have a 100mm Canon macro lens, but I'm not sure I can get back far enough. It's kind of "too good". 28-135 isn't the best for this either. Scanner picks up the texture of the paper.

This one was done with an S-90

Velociped

Time to look for the 35mm DX Tokina. I appreciate the advise.



Nov 14, 2012 at 04:29 PM
Michael Gordon
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p.1 #6 · p.1 #6 · Flat Field Macro Lens


The Oly 50/3.5 macro is generally rather perfect for a copy stand as far as working distance, flat field, sharp corner to corner. The bokeh can be harsh but that doesn't matter in this situation. It is rather inexpensive. Again it is fully manual lens to be used on an adapter.


Nov 15, 2012 at 11:42 PM
e6filmuser
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p.1 #7 · p.1 #7 · Flat Field Macro Lens


Michael Gordon wrote:
Again it is fully manual lens to be used on an adapter.

Fully manual on an adapter but auto diaphragm in the OM system.

Harold



Nov 16, 2012 at 07:34 AM





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