Upgrade the memory of your 2019 iMac up to 128GB
Handpicked deals...
$346 $346
SAVE $0

$699 $549
SAVE $150

$4499 $2649
SAVE $1850

$1699 $1199
SAVE $500

$5999 $5499
SAVE $500

$181 $110
SAVE $71

$7699 $7199
SAVE $500

$4499 $2649
SAVE $1850

$400 $330
SAVE $70

$4499 $2649
SAVE $1850

$4999 $4599
SAVE $400

$2350 $1950
SAVE $400

$1699 $1299
SAVE $400

$799 $699
SAVE $100

$200 $157
SAVE $43

$1997 $897
SAVE $1100

$250 $110
SAVE $140

$1398 $898
SAVE $500

$1199 $1099
SAVE $100

$3999 $2499
SAVE $1500

$200 $170
SAVE $30

$3999 $2499
SAVE $1500

$1498 $1398
SAVE $100

$2497 $1897
SAVE $600

$748 $598
SAVE $150

$899 $699
SAVE $200

$1300 $1100
SAVE $200

MTF for Hartblei 80mm f/2.8

This is a technical page. Skip it unless you understand MTF. Or see Making Sharp Images.

Most MTF charts plot contrast (MTF) at a distance from optical center, graphing 10/20/40 line pairs per millimeter, not so here.

These charts graph MTF from zero to 200 line pairs/mm, and there is one graph for each distance from the optical center. A distance of 21.3mm is the corner of a 35mm frame; a distance of 30.4mm is the corner of a 56mm X 24mm frame, which is what you get fully shifted 10mm in the long direction.

Note that Canon and Nikon MTF charts only go to 30 line pairs/mm. Zeiss supplies 10/20/40 line pairs/mm for most of its optics. So the charts on this page should be read out to the “40” mark only, to be (somewhat) comparable to the standard Zeiss MTF graphs.

The graphs were supplied by Hartblei, and used with permission.

Red is tangential, blue is sagittal

Hartblei 80mm f/2.8

The Zeiss datasheet shows Zeiss’s official technical data.

At center, resolving power is very high, reaching out to 100 line pairs per millimeter. Some astigmatism develops away from the center, but resolving power remains solid out to the edges of the 35mm frame.

Hartblei 80: MTF from 0 to 100 line pairs/mm at center
Hartblei 80: MTF from 0 to 100 line pairs/mm at 5mm offset
Hartblei 80: MTF from 0 to 100 line pairs/mm at 10mm offset
Hartblei 80: MTF from 0 to 100 line pairs/mm at 15mm offset
Hartblei 80: MTF from 0 to 100 line pairs/mm at 20mm offset

Conclusions

MTF performance examined near the edges and corners of the 35mm frame is a little disappointing. Possible explanations include field curvature, and field shots show very nice performance on “3D” images, so one can safely ignore these issues and instead be content with the superlative bokeh and color rendition.


MacPerformanceGuide.com

View all handpicked deals...

Dell P3418HW 34" 21:9 IPS Curved Monitor
$699 $549
SAVE $150

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.