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01-26-2014, 12:15 PM   #1
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Resolving for film ????

Resolving for film ????

This looks right ????

Dave

================================================== ========

T-Max 100
200 lp/mm



35mm film

PX CALC Logo - Get to know your screen
Enter the specs of your screen
Resolution

Horizontal Pixels 5000 x 7000
by
Vertical Pixels
Diagonal Size

Inches (4.3cm)
Design in life size. Design for life.™

When you zoom to 100% in programs like Photoshop or Illustrator you're not actually seeing true print size, but if you know your monitor's DPI (dots per inch), also known as PPI (pixels per inch), you can work around this.

Your screen’s info
DPI: 5081.11
Dot Pitch: 0.005mm
Size: 0.98" × 1.38" (2.5cm × 3.5cm)
Aspect Ratio: 5 × 7 (0.71:1)
Pixel Count: 35,000,000

Megapixels: 35MP


================================================== =======



For 4 x 5

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Horizontal Pixels 10160 x by 1270 Vertical Pixels
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Resolution

Horizontal Pixels x
by
Vertical Pixels
Diagonal Size

Inches (16.26cm)
Design in life size. Design for life.™

When you zoom to 100% in programs like Photoshop or Illustrator you're not actually seeing true print size, but if you know your monitor's DPI (dots per inch), also known as PPI (pixels per inch), you can work around this.

Your screen’s info
DPI: 5080.1
Dot Pitch: 0.005mm
Size: 4" × 5" (10.16cm × 12.7cm)
Aspect Ratio: 4 × 5 (0.8:1)
Pixel Count: 516,128,000
Megapixels: 516.13MP



================================================== =======
Minolta-16 13 × 17

PX CALC Logo - Get to know your screen
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Horizontal Pixels 2600 x 3400 by Vertical Pixels
Diagonal Size Inches (2.06cm)


When you zoom to 100% in programs like Photoshop or Illustrator you're not actually seeing true print size, but if you know your monitor's DPI (dots per inch), also known as PPI (pixels per inch), you can work around this.

Your screen’s info
DPI: 5277.67
Dot Pitch: 0.0048mm
Size: 0.49" × 0.64" (1.25cm × 1.64cm)
Aspect Ratio: 13 × 17 (0.76:1)
Pixel Count: 8,840,000
Megapixels: 8.84MP


01-26-2014, 12:57 PM   #2
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Kodak's MTF chart for 100TMX shows around 150 lp/mm at 30% contrast. Where are you getting 200 lp/mm from? And how may 4x5 lenses resolve over 80 lp/mm, I wonder. And then there the many variables like flim flatness, etc.
01-26-2014, 05:25 PM   #3
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From Kodak book 200 lp/mm I think was print 1970's or 1980's

Dave

QuoteOriginally posted by tuco Quote
Kodak's MTF chart for 100TMX shows around 150 lp/mm at 30% contrast. Where are you getting 200 lp/mm from? And how may 4x5 lenses resolve over 80 lp/mm, I wonder. And then there the many variables like flim flatness, etc.
01-26-2014, 05:31 PM   #4
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QuoteOriginally posted by smithdoor Quote
From Kodak book 200 lp/mm I think was print 1970's or 1980's

Dave
Kodak has all their film data sheets online. 100TMX today is a different formulation than 20 years ago, for instance. Can't say what effect that has on the film's resolving power.

http://www.kodak.com/global/en/professional/support/techPubs/f4016/f4016.pdf


Last edited by tuco; 01-26-2014 at 05:37 PM.
01-26-2014, 05:41 PM   #5
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On page 13 from Kodak
KODAK
PROFESSIONAL
Film
Resolving Power* Diffuse rms

T-MAX 100
63 lines/mm (TOC 1.6:1) Granularity† 8
200 lines/mm (TOC 1000:1)
====================================================
T-MAX 400
50 lines/mm (TOC 1.6:1) Granularity† 11
125 lines/mm(TOC 1000:1)

Dave


QuoteOriginally posted by tuco Quote
Kodak has all their film data sheets online. 100TMX today is a different formulation than 20 years ago, for instance. Can't say what effect that has on the film's resolving power.

http://www.kodak.com/global/en/professional/support/techPubs/f4016/f4016.pdf

Last edited by smithdoor; 01-26-2014 at 07:11 PM.
01-27-2014, 04:49 AM   #6
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QuoteOriginally posted by smithdoor Quote
T-Max 100
200 lp/mm
Quick question:
Acuity defined this way (lines per mm) anyone know what is the acuity of a 20/20 normal human eye at say about 1.5-2.0 feet under "normal" lighting?
01-27-2014, 06:07 AM   #7
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QuoteOriginally posted by wildman Quote
Quick question:
Acuity defined this way (lines per mm) anyone know what is the acuity of a 20/20 normal human eye at say about 1.5-2.0 feet under "normal" lighting?
Some can go down to 0.005 after than you need
As photos go closer to 0.010 most news print 80 line per inch metric is 3.15 lp/mm screen or 0.0125" and metric is .3175mm this also works for digital cameras
for printing in to Digital take a lot of pix to change the colors.

I started researching this because 40 years ago I was enlarging 35mm to 16x20 prints using TRI X and PAN X film I also made enlargement on the wall around 30 to 1 and work too.
Try to do this with digital and found enlarging to size did not work. Also tried to enlarge just part of digital photo did not work will.
So was trying find how many pixels will take to do the same photo in digital find number between film type/ASA and digital pixe
l

Dave

Dave


Last edited by smithdoor; 01-27-2014 at 07:44 AM. Reason: add
01-27-2014, 08:03 AM   #8
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Thread moved. General Talk is for non photographic related topics only.

Last edited by Tom S.; 01-27-2014 at 08:13 AM.
02-25-2014, 01:37 PM   #9
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QuoteOriginally posted by smithdoor Quote
I started researching this because 40 years ago I was enlarging 35mm to 16x20 prints using TRI X and PAN X film
Dave
I guess my EL-Nikkor enlarger lens must be worse than I thought. Because enlarging 35mm Tri-X to 16x20 produced really grainy images and poor tonal scale (strecthing the grain apart ) compared to my 120 roll film, 4x5 sheet and 36MP digital camera.
02-25-2014, 05:06 PM   #10
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Panatomic X was terrific. Sure wish we still had it to use today...

Chris
02-25-2014, 07:47 PM   #11
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QuoteOriginally posted by ChrisPlatt Quote
Panatomic X was terrific. Sure wish we still had it to use today...

Chris
I still have about 150 feet of bulk roll of it in my freezer.
02-26-2014, 12:30 PM   #12
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QuoteOriginally posted by ChrisPlatt Quote
Panatomic X was terrific. Sure wish we still had it to use today...

Chris
You and me both. T-MAX 100 is great, but Pan-X has a certain look to it.

QuoteOriginally posted by tuco Quote
I still have about 150 feet of bulk roll of it in my freezer.
Hoarder...


Steve
02-27-2014, 02:43 PM   #13
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Besides TMax 100 what are folks using for slow, fine-grained film nowadays?
My one attempt using still-available Ilford Pan F years ago came out real muddy...

Chris
02-27-2014, 02:56 PM   #14
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QuoteOriginally posted by ChrisPlatt Quote
Besides TMax 100 what are folks using for slow, fine-grained film nowadays?
My one attempt using still-available Ilford Pan F years ago came out real muddy...

Chris
I shoot 100TMX and 100ACR at EI 12 and get super fine grain.
02-28-2014, 07:40 PM   #15
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QuoteOriginally posted by ChrisPlatt Quote
Besides TMax 100 what are folks using for slow, fine-grained film nowadays?
My one attempt using still-available Ilford Pan F years ago came out real muddy...

Chris
Fuji Neopan Acros 100 is nice and has incredible reciprocity characteristics for long exposure. Fuji claims that its spectral response is orthopanchromatic meaning that sensitivity is biased to the blue end of things.

Other options include:
  • Adox CMS 20 II (Ultra fine grain, requires special developer)
  • Adox Silvermax 100 (non-tabular, fine grain, silver rich)
  • Rollei Retro 80s (very fine grain, extended red sensitivity)
  • Rollei ATP (think Technical Pan for today's shooters)


---------- Post added 02-28-14 at 06:51 PM ----------

QuoteOriginally posted by tuco Quote
And how may 4x5 lenses resolve over 80 lp/mm, I wonder.
And there is the key (or at least one of them). Media resolution is not the same as system resolution and even the best 4x5 scanning digital back is only as good as the lens mounted in front of it and many large format lenses are not really that good by 35mm and APS-C standards.

Summary? It is probably best to not be attempting to compare apples and oranges based on the reflective index of their skins.


Steve
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