not imported 'tot_psf' in psfmodels.__init__

[ZhenhongDu]

• psfmodels version: latest version
• Python version: 3.8
• Operating System: Windows 10

Description

Recently, I installed PSFmodels on a new computer, and I found that the function 'tot_psf' were not imported in the psfmodels.__init__function, so when I used 'psf.tot_psf function', there was a mistake. I added it by myself. Did you forget it?

not imported in psfmodels.init

[ZhenhongDu]

By the way, I want to ask that the NA value used in ex_lens = {**air_lens, 'NA': 0.01} is the illumination objective NA in tot_psf mode? In general, the illumination objective NA of our system does not fill the whole back focal plane. Should I use the reduced NA?

[tlambert03]

sorry about that, I removed it from the top level since I'm not sure how robust it is. I can add it back (but definitely use with some degree of caution and double check the source). You can still import it at

from psfmodels._core import tot_psf

In general, the illumination objective NA of our system does not fill the whole back focal plane. Should I use the reduced NA?

yep, any NA entered into a field here should be assumed to be the "effective" NA. If you use an iris or otherwise don't fill the BFP, your effective NA is lower than the nominal NA on the objective.

[ZhenhongDu]

Ok, thank you for your reply！