Exposure guesses
August 15th, 2005| Deadman’s Estimated Exposures (for 400 ASA b/w film) | |
| f/22 @ 1/1000s | Only encountered on the surface of the sun: the photographers equivalent of "the one that got away" in fishing. |
| f/22 @ 1/500s | Extreme bright frontal midday sun in highly reflective environment such as beach or desert. Rarely encountered. Shadows will be completely black. |
| f/22 @ 1/250 | Extremely bright frontal midday sun. Most shadows will be rendered as black. |
| f/16@ 1/250 | Frontal midday sun: no important parts of the subject in shadow. |
| f/11 @ 1/250 | Glancing midday sun: subject mostly in sun but some shadows with important detail. Also very bright open shade or bright hazy light. |
| f/8 @ 1/250 | Open shade or backlit subject where subject does not fill frame. Midday cloud. |
| f/5.6 @ 1/250 | Darker shade, or frame-filling backlit subject. Also darker cloud, fading afternoon light. |
| f/4 @ 1/250 | Dark shade or rainclouds. |
| f/2.8 @ 1/250 | Very dark shade, eg under portico or bus-stop. Dark storm clouds. Failing light. |
| f/2.8 @ 1/125 | 15 minutes after sundown. |
| f/2.8 @ 1/60 | Streetlights coming on. Bright interior of store or fast food joint. Bright store windows at night. |
| f/2 @ 1/60 | Regular store interior. London Underground trains. |
| f/2 @ 1/30 | Darker (but still lit) store interior. Bright London Underground. Brightly lit street at night. |
| f/1.4 @ 1/30 | Well-lit street at night (store windows will be overexposed). Normal house interior at night. |
| f/1.4 @ 1/15 | Dark house interior at night. Cathedral interior. |
| f/1 @ 1/15 | Candlelight. |
| Source: Pink Head Bug exposure guide | |
Bradford Wool Exchange windows
August 13th, 2005
The Bradford Wool Exchange completed in 1851 is apparently an example of ‘Venetian Gothic’. It now houses a Waterstones branch with a Starbucks upstairs.
The upper gallery has lanterns or ‘dormer windows’ set in the roof to provide extra light. These windows have an unusual pattern of panes – a modified triangle contains a circle of 7 circles, and then a Star of David . The 3-7-6 ratio formed here is unusual as the 7 and 6 don’t fit well together.
The sketch above does not show the proportions of the outer frame as I remember them (guess who didn’t think to take a photo). In the sketch, I have taken the radius of the arcs as the length of the side of the equalateral triangle that circumscribes the central circle. This radius not constrained by the pattern. The ring of circles and the Star of David are as they have to be to fit into the large circle – they are mathematically determined so my fallible memory is not stressed too much – all I have to recall is the fact that the 7 outer circles were radially determined and that the central circle was filled with the Star of David.
You see the star of David in quite a lot of Victorian buildings, not all associated with Jewish organisations, the symbol was widely used before the state of Israel came into being.
Read the rest of this entry »Right Hand, Left Hand
August 13th, 2005
Right Hand, Left Hand is a book by Chris McManus about handedness and lateral organisation in human beings. The book is packed with facts and figures but is also easy to read and connects with what McManus refers to as ‘real Biology’ and psychology.
The book is supported by a Web site from which you can download a further 200 plus pages of extended footnotes and historical material as well as full referencing. The Web site also contains tests and questionnaires for handedness research and raises the possibility of intriguing activities for students.
Web design note: John Hewson’s 2002 design for the Web site maximises search engine visability by providing all 200+ pages of the ‘hypernotes’ in HTML format as well as PDF format for those who want to print the material. The site is table-based with nested tables in the early pages. Deeper pages use raw conversion formats.
Seawatch
August 12th, 2005- The Sea Watch Foundation Surveys provide an opportunity to watch whales and dolphins and contribute to research
- The experimental design is a little informal but I guess provided the tours are repeated on the same course with the same number of observers the results will provide information over time
Churches and castles
August 10th, 2005
This Norman font has really quite scary figures on each cardinal point.
Read the rest of this entry »A sensible to do list
August 9th, 2005
- From The Not Insane To-Do List
- The three items will need to be serious items – background stuff like teaching already planned lessons and (soon) enrollment goes on anyway
- I like the PDF ready to print onto 5 by 3 inch cards
- Tom Peters has something similar in mind
- I found the sane to-do list on a blog called 43 folders . Has useful stuff but quite selling/advertising oriented.