weird zoom factors

[anonymous]

the zoom factors when zooming in currently follow the scheme:

100% 120% 144% 173% 207% 249% 299% 358%

Please excuse me if I call these factors "weird". There is roughly a factor of 2 after 4 iterations so I would have expected the sequence of zoom factors to either follow

- a strictly mathematical scheme with a factor of sqrt(sqrt(2))=1.1892... giving 2.00000 after 4 steps

- or a rounded scheme of the above, which is something like

1.00 1.20 1.50 1.80 2.20 2.70 3.30 3.90 4.70 5.60 6.80 8.20 There is a similar problem for the technical guys when selecting electrical resistors. This has been solved by dividing a decade in 12 steps and some rounding. (Search for "E12 resistor" on your favourite search machine.) E24 (dividing a decade into 24 steps) would give: 1.00 1.10 1.20 1.30 1.50 1.60 1.80 2.00 2.20 2.40 2.70 3.00 3.30 3.60 3.90 4.30 4.70 5.10 5.60 6.20 6.80 7.50 8.20 9.10

- or a scheme like 1.0 1.25 1.5 2 2.5 3 4 5 6 8

which divides the decade into 10 steps with some "intuitive" rounding. 1.2589...=10^0.1

The current scheme does not follow one of the above _and_ falls short of being "intuitive", which is why I took the freedom to call it "weird".

Maybe there are other factors commonly used in DTP (I would not know). They probably would take precedence over the above mentioned zoom factors.

Greetings, Frieder