Photo by: Derek Doar
Nottingham & Notts Photographic Society

Technical Information



In this article, we will discuss how to join an instant meeting through an email invite, an instant messaging invite, from the browser, from the Zoom desktop and mobile application, from a landline or mobile phone, and with a H.323 or SIP device.

Before joining a Zoom meeting on a computer or mobile device, you can download the Zoom app from our Download Center. Otherwise, you will be prompted to download and install Zoom when you click a join link.

You can also join a test meeting to familiarize yourself with Zoom.

How to use a virtual background in a Zoom meeting


The Virtual Background feature allows you to display an image or video as your background during a Zoom Meeting. This feature works best with a physical green screen and uniform lighting to allow Zoom to detect the difference between you and your background. You can upload your own images or videos as a virtual background. You can also use Virtual Background in a Zoom Room.


In this video tutorial, Dusty Porter will show you everything you need to know about Zoom video conferencing. How to join, host, and so much more.


If you’ve ever shot infrared photography, you’ve probably run into hotspots before, and they probably ruined more than a few of your shots. If you haven’t seen them, a hotspot is a bright spot that forms in the center of the image.

In general, some lenses form hotspots, while some do not. Hotspots will get more intense at smaller apertures, and are usually not present at wider apertures. On some lenses the hotspot is very aggressive and the lens is not usable at any apertures, on some the hotspot is mild and is only present at borderline apertures.

There has been a lot of community efforts to share which lenses work well and which do not. We compiled a comprehensive list of feedback on lens performance, but there is a lot of conflicting reports because even at any given aperture, hotspots only appear in some conditions. So while there was a lot of mixed reports, one thing that seemed clear was that hotspots were a lens specific issue.

How to Calibrate Monitor For Photography with
X-Rite i1 Display Pro

In this video you'll discover how to calibrate your computer monitor for Photography and Videography using the X-rite i1 Display Pro and X-rite i1 Profiler software.

In order to produce accurate color and to have proper shadow and highlight detail in your images you'll need to calibrate your monitor display that you use for your photo retouching.

Color Spaces Explained

Have you ever exported a photo, uploaded it to the Web, and then noticed that the colors looked off on your monitor? The reason is likely the color space of your photo. Here’s a helpful 15-minute video by PHLEARN that provides a crash course on color spaces and how to use them

Improve Your Astrophotography with a Bahtinov Mask

Neutral Density Filter, Exposure Calculation Chart
(for using the 10x or 6x Neutral Density Filter)
(Click on the PDF logo to get the Exposure Calculation chart as a .pdf file.)

A Neutral Density (ND) filter like this B&W 110 ND is often needed if you want to experiment with long exposures, reducing the amount of light that passes through the lens to the sensor and allowing you to use slower shutter speeds in your shots. This slowing down of the shutter lets you capture the motion of flowing water, windswept grasses or clouds etc. as a blur, which can result in very creative images.

Using the B+W 110 N is quite an art – You have to compose and focus shots before adding the filter, as once it is on you can barely see anything through the viewfinder (With some cameras it can be left on if you use with Live View). If you fancy experimenting with really long exposures it's a fabulous tool, allowing you to use slow shutter speeds even in full daylight conditions. Very specific, but good fun!

Click for review and how to use

In contrast to the regular Neutral density grads where the graduation transition is from the top of the filter, the reverse grad offers the transition from dark to light from the middle of the filter (ie in reverse).

This is a benefit when shooting bright horizons to enable more control over the exposure and balance the foreground image.

The filters are available in 3 densities 0.3, 0.6, 0.9.

Adobe RGB (1998) vs ProPhoto RGB
By Derek Doar

For some years now, since the Digital Photography revolution began, photographers have been recommended to use Adobe RGB (1998) as their working color space.

Photographic technology has moved forward at an alarming rate and given us better cameras, monitors, printers and software.

Is it now the time to change to ProPhoto RGB?

Click to view article

An article on Color Space Conversion
on the Cambridge in Colour Website

An article on the Basics of Digital Camera Pixels
on the Cambridge in Colour Website

Adobe Camera Raw 6.1 User Guide
by Francesco Marzoli

This article was offered free by
Author of the first Camera Raw User’s Manual, winner of the Adobe YouGC Contest, Francesco works as
Photoshop consultant and teacher in courses, workshops and seminars. Francesco Marzoli became an Adobe Certified Expert in Photoshop and Beta Tester for X-Rite products.

Click to view article

This website contains some excellent technical tutorials.

Click on the image
to view the Website

RAW Update Compatibility Chart
Having trouble getting the RAW files from your camera to open in Photoshop or Elements?

Then check out this free PDF guide!

Load it up, find your camera make and model, then read across to see which version of Adobe Camera Raw you need and follow the tips on downloading and installing.

You’ll be up and running in no time!

(To download the compatibility chart as a .pdf file, click on the PDF logo)

Webinar Archive:
Beyond Monitor Calibration - Get Prints That Match Your Display!
One of the most frustrating things that can happen to any photographer is getting prints that don't look like the image that we saw on our monitor. Dark images, color shifts or just plain bad color are common results back from both desktop printers and labs when you don't have a Color Workflow for your system

Watch this FREE Webinar to see for yourself how to easily have your printed images match your display - every time!

Click on the image
to view the Webinar

NEW Video | X-Rite i1Display Pro
The X-Rite i1Display Pro is an exciting newly designed colorimeter making it the most advanced monitor and projector profiling hardware available.