Thinking about it, I think it is over fifty years since I studied optics.

It was at a level of a simple lens depicted as a vertical line in the centre of a sheet of paper. A horizontal line all across the middle. At the right, a short vertical line going up from the horizontal line, the short vertical line having an arrow head at its upper end and was designated as the object. Then there was a dot on the line a distance away to the left from the lens.

Suppose please for our discussion here, at least to start, until something else is needed, that the object is the painting at The National Gallery in London discussed in the following article and that our experimental set up is located such that a fish eye lens is needed to get the side edges of the painting into the photograph, and the centre of our line of sight is the eye of the white horse, even though it is not quite in the centre of the picture.

https://en.wikipedia.org/wiki/The_Battle_of_San_Romano

William

Indeed.

So as the product is only available at all until the middle of December, part of the reason I have ordered one now is to try to maximize my chances of getting one..

With these things I have no idea how many are put out on the shelves at any one time. If there are, say, four, then they could go quckly or sit there for a long time. I suppose it only needs one person to buy one, try it, be impressed and tell friends and there could be a run on them.

Over the years there have been a few things that I could not get until the third order.

For example a Tesco Aura Cereal Bowl Ochre. Alas now discontinued, but eventually I got three.

They were £1.50 or £1.75 or something like that.

Shortly after Tesco cut the four ochre items from the Aura range I searched on the web and saw them being sold elsewhere for over £7.

I have a Tesco Aura Cereal Bowl in each of the four colours. I stand small pots containing houseplants in them, I have never used them as cereal bowls.

For larger pots containing house plants I use Tesco Aura Pasta Bowls.

William

Thank you, Joe.

I have watched this video all the way through.

https://www.youtube.com/watch?v=gboGX89BpNU

21 minutes 9 seconds

The video was made three years ago and the kit reviewed was $26 at that time.

So the Tesco one is £3.50 and not purported to do as much.

However, on the basis of watching the video and learning of how it fits on and gets adjusted I have added one of the £3.50 ones to my next grocery order because I think it is worth that to have some enjoyment experimenting with it and if I can get a picture using it then I can email it to myself from the camera and then there is the opportunity to put it into a PDF document using Affinity Designer software and get a digital print from Viking Virtual Print House.

I found the best bit of the video was about the telephoto lens. The Blue Sky kit does not have one of those.

However, I note that it has a macro lens.

I did not know what that was about, but I found this article.

https://www.imaginated.com/blog/what-is-macro-lens/

I did once try to take a close up picture of something with my very basic mobile phone and it was a very blurry image.

There is some information about how to use the Blue Sky kit on the Tesco website.

The picture on the Tesco website just shows the front of the pack. There might well be printed information on the back of the pack.

William

YouTube is running the My Mix play list.

It paused, then went through the second one fine.

It then paused a little.

Then did a five second advert.

Then started another video, stopped after a few seconds, then, while I am typing this, keeps singing a bit, then pauses the starts again.

How long will it take until it gets to the strangers looking out of the window? :-)

William

Thank you, Alfred.

William

Thank you.

William