Yesterday (3/27/2010) I wondered what a 15-to-1 zoom would look like. Wait. I
can go 40-to-1 if I change lenses. What would 40-to-1 look like? I decided this
would take several passes so my first cut was in the living room here. I
started zoomed in all the way because that is the best way to get an object to
follow through various focal lengths. I chose the temperature dial on the
fireplace smoke stack pipe.
I put the tripod in the dining room, about 20 feet away. I shot at 400mm, 300mm,
200mm and 100mm. Then I changed lenses and shot again at 100mm, then 80mm, 50mm
and 28mm. I changed lenses again and made two more shots: 28mm and 17mm. And
one more lens change and two more shots: 22mm and 10mm.
For the web I didn't use 3 of the 12 photos.
First 40-to-1 zoom pictures
What I learned from this was two things. The first image wasn't sharply focused
on the dial markings and the last zoom jump, 10mm and 17mm, was too much.
The next day, today, I planned to do this outdoors in two locations. The pump
house and greenway near the entrance to Kachina Village and somewhere near Lake
Mary. I also decided to try an animated GIF to step thru the zoom-images
In the end I didn't do a 40-to-1 zoom at Lake Mary but I did a lot of
Depth-of-Field work. I did make an animated GIF only to discover the GIF file format
has very limited colors, like 244, not the thousands of a JPG file.
I experimented and chose web-dithered colors.
I also put the most zoomed-in and the most zoomed-out together in one image.
And there is a web page of the 10 pump-house images too.
2nd 40-to-1 zoom pictures
10mm, 15mm, 22mm, 28mm, 47mm, 70mm, 100mm, 200mm, 300mm and 400mm. Note my Canon
40D camera has a 1.6x crop factor so multiple each focal length by 1.6 to get
the actual focal length.