Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$2299 $1799
SAVE $500

$1597 $1297
SAVE $300

$80 $33
SAVE $46

$2299 $1799
SAVE $500

$1898 $1498
SAVE $400

$2799 $2299
SAVE $500

$2299 $1799
SAVE $500

$600 $400
SAVE $200

$240 $175
SAVE $65

$699 $499
SAVE $200

$400 $300
SAVE $100

$1599 $1398
SAVE $201

$2042 $1597
SAVE $445

$1699 $999
SAVE $700

$180 $100
SAVE $80

$1199 $1099
SAVE $100

$1199 $1099
SAVE $100

$999 $949
SAVE $50

$1849 $1199
SAVE $650

$400 $300
SAVE $100

$1699 $999
SAVE $700

OWC Envoy Pro Elektron

Ultra-high performance across entire capacity, outperforms the competition.

Tiny, bus-powered, rugged, compact!


√ No more slow and noisy hard drives!

Resolution and Diffraction

Here we examine the progression in image sharpness and contrast from f/4 through f/22 on the Hartblei 120/4. Lens design has subtle interactions with diffraction, and some lenses do hold up slightly better than others; the Hartblei 120/4 holds up exceptionally well when stopped down.

This subject, the power-coated metal surface of a storage rack, was chosen because of its “fractal” nature and its contrast. The 24.4MP Nikon D3x was used for this test.

Aperture series

The subtle graying of detail is visible even by f/8, as is expected with any top-quality lens (lesser lenses start out crappy and improve by stopping down to f/8 or f/11).

By f/11 the graying of black and white is obvious, along with the loss of contrast in fine detail, most easily seen by noting the loss of the fine bright speckles.

Wide open at f/4, contrast is very good, but slightly low; this is expected of virtually every lens.


f/4

Contrast peaks quickly at f/5.6 (below).


f/5.6

Aperture f/8 (below) is a very strong choice, but whites are a little less white and blacks are a little less black than aperture f/5.6 above.


f/8

Observe that even f/8 (above) has gone slightly gray, but that f/11 (below) shows near black areas going gray, bright speckles disappearing, etc. This is diffraction at work, and no lens can avoid it at f/11.


f/11

Aperture f/16 is still acceptable, but contrast is low; there are no blacks or whites anymore. The effects of diffraction are at work here.


f/16

Aperture f/22 has held up well, but compare to the f/5.6 result, shown again below it, to see just how much as been lost in terms of contrast and biting detail. There are those that maintain that such detail can be recovered, but that is difficult without also losing subtle tonal values and in this case, looks impossible.


f/22

Compare f/22 above to f/5.6 below.


f/5.6

Conclusions

The Hartblei 120/4 maintains high image quality under the duress of diffraction, but by f/22 it succumbs as all lenses do to the contrast and sharpness-robbing effects of diffraction.

There is no magic to be had, but you’re unlikely to find a lens that behaves better than the Hartblei 120/4 does when stopped down.

Thunderbolt 4 Dock

Thunderbolt 4 hub and ports!

Any Mac with Thunderbolt 3.


OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!

Best Deals, Updated Weekly

View all handpicked deals...

LG BXPUA 55" Class HDR 4K UHD Smart OLED TV
$1597 $1297
SAVE $300

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.