877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$2798 $2198
SAVE $600

$348 $278
SAVE $70

$389 $299
SAVE $90

$322 $322
SAVE $click

$2098 $1298
SAVE $800

$1499 $1129
SAVE $370

$322 $242
SAVE $80

$1499 $1129
SAVE $370

$1299 $949
SAVE $350

$330 $330
SAVE $click

$498 $398
SAVE $100

$180 $140
SAVE $40

$1299 $949
SAVE $350

$500 $275
SAVE $225

$180 $136
SAVE $44

$130 $110
SAVE $20

$2997 $2497
SAVE $500

$3498 $2998
SAVE $500

$370 $280
SAVE $90

$4899 $4499
SAVE $400

$1000 $1000
SAVE $click

$1699 $1149
SAVE $550

$280 $230
SAVE $50

$1899 $1499
SAVE $400

$4499 $3499
SAVE $1000

$2198 $1998
SAVE $200

$3998 $3498
SAVE $500

$1799 $1699
SAVE $100

$18599 $16599
SAVE $2000

$1149 $799
SAVE $350

$650 $450
SAVE $200

$199 $119
SAVE $80

$280 $200
SAVE $80

$1399 $1049
SAVE $350

$1199 $779
SAVE $420

$250 $200
SAVE $50

$1699 $1149
SAVE $550

$1499 $999
SAVE $500

$200 $130
SAVE $70

$76 $46
SAVE $30

$120 $30
SAVE $90

$189 $159
SAVE $30

$3899 $1499
SAVE $2400

$2999 $1999
SAVE $1000

$1699 $849
SAVE $850

$1698 $1198
SAVE $500

$1149 $799
SAVE $350

$1399 $1049
SAVE $350

$1498 $998
SAVE $500

$2797 $2497
SAVE $300

$280 $230
SAVE $50

$899 $549
SAVE $350

$1699 $1149
SAVE $550

Upgrade the memory of your 2018 Mac mini up to 64GB
OWC Black Friday Deals

Upgrades, sound, iPad/iPhone, computing, storage, more!
B&H Photo Black Friday Deals

Photo, video, television, far more!.

Optical Performance

Coastal Optics 60mm f/4 UV-VIS-IR APO MACRO

Full review of the Coastal Optics 60mm f/4 UV-VIS-IR APO MACRO is found in DAP.

This page discusses overall optical performance.

MTF (modulation transfer function)

The Coastal 60/4 is diffraction-limited by f/8 across the UV-VIS-IR spectral band, except at infinity, where aberrations requires f/8 to sharpen the edges and corners.

A few exotic lenses approach this level of performance, such as the Leica 300mm f/4 APO or the 90/2 APO Summicron-R or the 180/2.8 APO-Elmarit-R, but none of them can do so outside the visible light range.

Update May 2012: the Coastal 60/4 shows some weakness until f/8. This is easily observed on cameras like the Nikon D3x or Nikon D800. This is unfortunate because f/5.6 is already limiting peak performance on the 36-megapixel Nikon D800.

The coma and oblique spherical disappear quickly on stopping down, which is why performance in the extreme corner suddenly gets great at f/8. If the problem were truly field curvature then the improvement would be much more gradual.

OWC ROVER PRO wheels for Mac Pro

No tools or hassle… just place your Mac Pro’s factory feet into the Rover Pro’s polished stainless-steel housings and secure with a few hand twists.

When you’re done moving your Mac Pro around, the Rover Pro makes it just as quick and easy to convert back to the factory feet for stationary use.

MTF at infinity, visible light (400 - 700nm), f/4, f/5.6, f/8

Wide open at f/4, MTF is excellent, indeed outstanding in the center, dropping off gracefully into the extreme corners. Conventional lenses stopped down 2-3 stops might show somewhat better performance in the corners in most of the visible light range, but most will also show chromatic errors that are not seen with the Coastal 60/4. One stop down at f/5.6 the 60/4 offers world-class performance; stopping down just 1/3 or 2/3 stop from f/4 yields most of this improvement. HOWEVER, shooting at infinity focus shows field curvature that demands f/8 for sharpness to the extreme corners. The MTF graph doesn’t show this, and my sample was hand-tuned by Coastal.

More important for many subjects will be depth of field, which makes f/8 the optimal aperture for overall results in practice. While a graph for f/11 is not available, diffraction can be expected to reduce performance noticeably.

MTF at infinity, visible light

MTF at infinity for UV & IR, at 1:2 for visible light

Performance in the UV band is simply outstanding, and still outstanding in the infrared band, though slightly lower due to diffraction, which degrades performance with longer wavelengths.

MTF at infinity for UV & IR, 1:2 for visible light

Chromatic aberrations and distortion

This level of chromatic correction is extremely difficult to achieve, which explains why the Coastal 60/4 uses so many fluorite elements, which are expensive (and even the supply of calcium fluoride glass is limited).

Distortion is extremely well controlled for a 60mm lens.

Distortion (left) and chromatic aberrations (right)

Relative illumination and spectral transmission

See the Spectral Transmission page for more on spectral graphs. Vignetting is minimal, an excellent performance by f/5.6, the optimal aperture.

Distortion (left) and chromatic aberrations (right)

 

Holiday Deals on Camera Gear


Sony, Nikon, Canon, Fujifilm, more!
OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ 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!
OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!

Our trusted photo rental store

View all handpicked deals...

Sony WH-1000XM4 Wireless Noise-Canceling Over-Ear Headphones (Black)
$348 $278
SAVE $70

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.