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05-28-2011, 12:49 AM   #1
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reproductions with 645D what macro lens in mid range

I have the Macro 120 A what I find awesome but for many purposes an large paintings on location it is too long. What is a comparable alternative in the mid range (60-80mm) with minimum distortion, CA, flat field. I would not mind using an adapter and use a Pentax 67, Hasselblad or Pentcon Six lens for this purpose.

Thank you for advice and experience - Gerhard

05-28-2011, 01:21 AM   #2
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I would recommend stitching several photographs together for such critical work. For example:Photograph the left half of the painting, then the right half and combine the images in Photoshop. For this method I would place the the painting on a flat plane that allows for horizontal movement, moving the camera could introduce keystoning errors.

I have used a similar technique for copying art using 4X5 format camera making use of the shift movement - then scanning the images in and combing them in photoshop.
05-28-2011, 06:42 AM   #3
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thanks Digitalis,
this is what I did once in a while shooting with 35 digital full frame using the TS 90 to get a 40 MB file. But it is not efficient for reproduce lots of paintings. I'm more interested in the one shot approach.
I will have to wait until my A 75 and the SA 45-85 arrive, to see wether they give good enough results in that regard.
05-28-2011, 07:36 AM   #4
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I am interested in a mid-range macro solution as well.

I found this on Flickr but am not quite sure what it means. although, I would like to find out:

IMGP5626 | Flickr - Photo Sharing!

05-28-2011, 07:40 AM   #5
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Why do you need a macro if you want to shoot something big?
05-28-2011, 07:46 AM   #6
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QuoteOriginally posted by gkb Quote
But it is not efficient for reproduce lots of paintings. I'm more interested in the one shot approach.
then be prepared to make compromises in image quality, personally I wouldn't. Many of the Artists I know have extremely exacting standards with how their work is photographed, and I have found the stitching technique to be a suitable solution.

I am a firm believer in the K.I.S.S principle, and the more complicated a solution you use the greater the probability that things will go wrong. There are many things that can go wrong like Distortion correction( some lenses have a wavy distortion characteristic) astigmatism, and problems with uneven corner/centre resolution from wider lenses. I think you are better off sticking to the 120mm macro.

Last edited by Digitalis; 05-28-2011 at 05:09 PM.
05-28-2011, 10:13 AM   #7
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I do reproductions for museums and archives. Have you tried the 55mm DFA or 75mm FA? They will give you good results for your artists.
05-29-2011, 03:26 PM   #8
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55mm and 75mm are not distortion free at all and they are not calculated for a flat field.
I came across the adaption of a Leica Elmar 3,5/65. This is a macro lens that could be also useful for my needed 1-10 meter distance. ALso the angle of view would be just perfect matching my so far used macro 50mm on a full frame 35mm camera. I will look closer into it.

05-29-2011, 03:44 PM   #9
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that Leica Visioflex 65mm f/3.5 Elmar is a 35mm lens - it can't be used on a medium format camera.

"55mm and 75mm are not distortion free at all and they are not calculated for a flat field."

They can be used for flat work if you stop them down far enough, and just about every lens ever made has some degree of distortion.The 645 D-FA55mm and FA/A 75mm f/2.8 lenses should be fine.

Last edited by Digitalis; 05-29-2011 at 03:49 PM.
05-30-2011, 01:12 AM   #10
gkb
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https://www.pentaxforums.com/forums/1420293-post1.html
sergiolov says it works and the 645D chip is fully covered.
05-30-2011, 01:37 AM   #11
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I stand corrected, however there aren't any Manual focusing screens designed for the Pentax 645D, and secondly you will have to find the Visioflex adapter as well as the lenses - not easy thing since those lenses are very very old. I think you would do better, and work quicker with just the D-FA 55mm f/2.8
05-30-2011, 07:58 AM   #12
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the D-FA 55mm f/2.8 is fine to shoot wide open, nice and sharp. But has bad distortion. Now I tested the 2.8 75 A version and found it pretty good regaring distortion (not straight like the macro 120 though), and CA is ok too. Sharpness is also nice at f11. Best would be to have such a Leica Elmar 3,5/65 somewhere already adapted and make a comparison test...
05-30-2011, 09:35 AM   #13
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There is a lens profile in ACR that corrects the 55mm distortion.
05-30-2011, 10:58 AM   #14
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For flat field reproduction work I find that most enlarging lenses fitted to bellows work best for sharpness and distortion free. The catch is you need to line up the work such that it is parallel to the image plane in the camera.

I used 80 or 105mm Apo Rodagon on bellows with the 645's
05-30-2011, 02:26 PM   #15
gkb
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I have the 80 Apo Rodagon and held it in front of the camera. I'm shure that this his a highly perfekt optical solution in all regards. There is very little distance. Does a 645 bellows work? Another solution or succestion? Zoerkendoerfer maybe?
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