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Scanner Nikkor 40 mm (ED) tested

 
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enricosavazzi



Joined: 21 Nov 2009
Posts: 854
Location: Stockholm, Sweden

PostPosted: Sun Dec 10, 2017 8:25 am    Post subject: Scanner Nikkor 40 mm (ED) tested Reply with quote

http://savazzi.net/photography/scanner_nikkor_40mm.html
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typestar



Joined: 12 Dec 2009
Posts: 124
Location: Austria

PostPosted: Sun Dec 10, 2017 10:12 am    Post subject: Re: Scanner Nikkor 40 mm (ED) tested Reply with quote

enricosavazzi wrote:
http://savazzi.net/photography/scanner_nikkor_40mm.html


Dear Enrico,

thankyou for your detailed and excellent test of the little Nikon ED Scanner lens (the lens you got from me) --

Great to know, what your test confirms and what some had supposed:
we have a really very usefull & little Nikkor without any CA problems in a tiny setup!
So, perhaps we can see soon some of your nature closeup pictures taken with this lens ... ;-)

Thankyou and good luck for your further tests,

Christian


Last edited by typestar on Sun Dec 10, 2017 10:16 am; edited 1 time in total
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18244
Location: Richland, Washington State, USA

PostPosted: Sun Dec 10, 2017 10:15 am    Post subject: Reply with quote

Thanks for the report. I notice that this lens has significant curvature of field. I've often wondered if scanner lenses have some curvature specifically included in the design in order to partially correct for typical curvature of film when used in glass-free mounts. Do you have any idea whether that's the case here, or how the curvature of this lens compares to the curvature of other scanner lenses?

--Rik
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enricosavazzi



Joined: 21 Nov 2009
Posts: 854
Location: Stockholm, Sweden

PostPosted: Sun Dec 10, 2017 11:25 pm    Post subject: Reply with quote

Hi Rik,

at 1.4x and higher, there seems to be no significant curvature of field. There is instead a significant curvature of field at 1x and below, but at these magnifications the lens is outside its apparent optimal magnification. I have no way to know whether field curvature at 1x is by design, but considering that the lens magnification in the scanner is 1.33x, this does not seem likely.

Reversing the lens did not make things any better in my test. It is possible that one of the problems at low magnification is also spherical aberration caused by a sensor filter stack that does not match the lens design specifications (some 5 mm for Micro 4/3, less than 0.5 mm on the scanner sensor). The lens could already be fast enough to be sensitive to this type of problem, especially at low magnification.
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enricosavazzi



Joined: 21 Nov 2009
Posts: 854
Location: Stockholm, Sweden

PostPosted: Sun Dec 10, 2017 11:33 pm    Post subject: Re: Scanner Nikkor 40 mm (ED) tested Reply with quote

typestar wrote:
enricosavazzi wrote:
http://savazzi.net/photography/scanner_nikkor_40mm.html


Dear Enrico,

thankyou for your detailed and excellent test of the little Nikon ED Scanner lens (the lens you got from me) --

Great to know, what your test confirms and what some had supposed:
we have a really very usefull & little Nikkor without any CA problems in a tiny setup!
So, perhaps we can see soon some of your nature closeup pictures taken with this lens ... ;-)

Thankyou and good luck for your further tests,

Christian

And thank you for providing this lens. There won't be much chance for field nature shots this time of the year in Sweden, but spring is only 1/3 of the year away :-)

I would rate this lens as better (especially for stacking) than Zeiss Luminars and Leitz Photars at 1.3x-3x, primarily for the lack of chromatic aberration.



And a really small test pattern at 3.3x, 1:1 pixel crop on 20 Mpixel Micro 4/3, just for the fun of it.
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 1076
Location: Santa Clara, CA, USA

PostPosted: Mon Dec 11, 2017 8:50 am    Post subject: Reply with quote

enricosavazzi wrote:
Hi Rik,

at 1.4x and higher, there seems to be no significant curvature of field. There is instead a significant curvature of field at 1x and below, but at these magnifications the lens is outside its apparent optimal magnification. I have no way to know whether field curvature at 1x is by design, but considering that the lens magnification in the scanner is 1.33x, this does not seem likely.

Reversing the lens did not make things any better in my test. It is possible that one of the problems at low magnification is also spherical aberration caused by a sensor filter stack that does not match the lens design specifications (some 5 mm for Micro 4/3, less than 0.5 mm on the scanner sensor). The lens could already be fast enough to be sensitive to this type of problem, especially at low magnification.


Thanks, this answers a question I was going to ask. I was hoping the lens would be reversible, so that it would be useful at ~0.7x for imaging 19mm US Cents, but it seems the field curvature at lower mags is still a problem.
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mawyatt



Joined: 22 Aug 2013
Posts: 983

PostPosted: Mon Dec 11, 2017 8:55 am    Post subject: Reply with quote

ray_parkhurst wrote:
enricosavazzi wrote:
Hi Rik,

at 1.4x and higher, there seems to be no significant curvature of field. There is instead a significant curvature of field at 1x and below, but at these magnifications the lens is outside its apparent optimal magnification. I have no way to know whether field curvature at 1x is by design, but considering that the lens magnification in the scanner is 1.33x, this does not seem likely.

Reversing the lens did not make things any better in my test. It is possible that one of the problems at low magnification is also spherical aberration caused by a sensor filter stack that does not match the lens design specifications (some 5 mm for Micro 4/3, less than 0.5 mm on the scanner sensor). The lens could already be fast enough to be sensitive to this type of problem, especially at low magnification.


Thanks, this answers a question I was going to ask. I was hoping the lens would be reversible, so that it would be useful at ~0.7x for imaging 19mm US Cents, but it seems the field curvature at lower mags is still a problem.


Ray,

Around 0.7X wouldn't a standard macro lens like the Nikon 105mm f2.8 or Canon/Sigma/Tamron equivalent be good enough?

Best,

Mike
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ray_parkhurst



Joined: 20 Nov 2010
Posts: 1076
Location: Santa Clara, CA, USA

PostPosted: Mon Dec 11, 2017 9:11 am    Post subject: Reply with quote

mawyatt wrote:
ray_parkhurst wrote:
enricosavazzi wrote:
Hi Rik,

at 1.4x and higher, there seems to be no significant curvature of field. There is instead a significant curvature of field at 1x and below, but at these magnifications the lens is outside its apparent optimal magnification. I have no way to know whether field curvature at 1x is by design, but considering that the lens magnification in the scanner is 1.33x, this does not seem likely.

Reversing the lens did not make things any better in my test. It is possible that one of the problems at low magnification is also spherical aberration caused by a sensor filter stack that does not match the lens design specifications (some 5 mm for Micro 4/3, less than 0.5 mm on the scanner sensor). The lens could already be fast enough to be sensitive to this type of problem, especially at low magnification.


Thanks, this answers a question I was going to ask. I was hoping the lens would be reversible, so that it would be useful at ~0.7x for imaging 19mm US Cents, but it seems the field curvature at lower mags is still a problem.


Ray,

Around 0.7X wouldn't a standard macro lens like the Nikon 105mm f2.8 or Canon/Sigma/Tamron equivalent be good enough?

Best,

Mike


Well, if that were the case, then my last 8 years of effort would be a waste Wink

There are several reasons the standard macros don't do well for imaging small coins. In fact my purchase of a 105mm VR Micro Nikkor back in 2009 is what set me on the path I am still on. The 105VR is still in my stable of lenses, but only gets used occasionally for flowers and such.

A lot of coin photographers use the longer standard macros (the Sigma 150mm is especially popular) with good results, but I've never wanted to deal with the very large systems these require.
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