Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2018 Mac mini up to 64GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$399 $199
SAVE $200

$1699 $1199
SAVE $500

$2797 $2497
SAVE $300

$1398 $998
SAVE $400

$1499 $999
SAVE $500

$549 $499
SAVE $50

$799 $549
SAVE $250

$1699 $949
SAVE $750

$3899 $1499
SAVE $2400

$1398 $998
SAVE $400

$240 $175
SAVE $65

$240 $175
SAVE $65

$1399 $799
SAVE $600

$1997 $1797
SAVE $200

$3399 $2699
SAVE $700

$400 $300
SAVE $100

$1647 $1445
SAVE $202

$2090 $1690
SAVE $400

$1699 $949
SAVE $750

$1199 $1099
SAVE $100

$1199 $1099
SAVE $100

$999 $949
SAVE $50

$1699 $949
SAVE $750

Table of f-stops: Full Stops, 1/2 Stops, 1/3 Stops (Depth of Field)

Sometimes I need to refer to these aperture scales when preparing material. And sometimes lenses are just off a little bit (or a lot). Also, cameras round f-stops and exposure values, and this leads to inconsistent exposure values with some cameras.

For example, when a camera displays f/5.6, is it f/5.6 or f/5.657 (the actual one-stop difference from f/4)? And is f/1.2 actually f/1.19 or f/1.122?

Of course, in the latter case of a bright aperture (f/1.2), the T-stop matters a whole lot more. It’s not much of a difference but video shooters doing precision work presumably care. Further complicating matters, the distribution of light across the frame can change even in the center even at the same exposure value (EV), so all sorts of differences can accrue to some confusion in total. It’s a regular headache when preparing aperture series for presentation.

One also has to wonder whether 1/13 second is twice 1/25 second: is it really 1/13 second, or actually 2/25 second and displayed as 1/13?

I see minor variations all the time with aperture series when there ought to be none, so I suspect that cameras by and large either are doing it wrong (rounding the actual exposure not just rounding for display), or else have errors for aperture or shutter speed, or both.

f = √(2^AV) where AV is the aperture value.

Note that depth of field for any aperture number is relative to the format size.

This table of f-stops / apertures shows half stop aperture series, 1/3 (third) stop aperture series and whole stop aperture series. Aperture / f-stop rounding is common and especially at wider apertures the rounding is less important than the T-stop. Moreoever it cannot be assumed that the lens diaphragm delivers precisely the value one expected: some lens diaphragms are not perfectly symmetrical and there is the precise diameter as well.

f-stop aperture series: whole stops, 1/2 stops, 1/3 stops
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

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2021 diglloyd Inc, all rights reserved.