Re: [Phys-l] moon illusion measurement

[Bernard Cleyet <bernardcleyet@redshift.com>]

Good point -- depending on the lens, how much focusing changes  
magnification.

bc has noticed some extreme cases, e.g. inexpensive e-microscope.



On 2009, Nov 05, , at 07:24, Ken Fox wrote:

> In one picture they are 3.0 mm
> apart on the other they are 2.8 mm apart. Other distances are  
> similarly
> altered.
>
> I am wondering if when you are focusing on the rising moon the  
> camera has a
> lot of terrestrial objects to confuse its focus (the heart of the  
> illusion)
> and when over head it sees only the moon and adjusts its focus to
> accommodate.