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You want to check the FWHM of the PSF of your telescope? Ah, no, you 
write for confocal imaging. Then I really wonder what you plan to do 
with them.

Cucurbita (pumpkin, squash, zucchini) pollen is said to be ~170-180 µm 
diameter, apparently the largest pollen known. If they are as 
fluorescent as others, they might do the trick, depending on what you 
want to do with them. Certainly would come cheaper than the latex spheres.

Steffen

Am 20.04.2016 um 06:36 schrieb Jacqui Ross:
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> To join, leave or search the confocal microscopy listserv, go to:
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>
> Dear All,
>
> Does anyone know of a company who can supply fluorescent spheres in this size range suitable for confocal imaging? I know people are usually looking for standards at the other end of the scale!
>
> I've had a look at Bangs Laboratories and Spherotech but they don't seem to have anything large enough...
>
> Kind regards,
>
> Jacqui
>
> Jacqueline Ross
> Biomedical Imaging Microscopist
> Biomedical Imaging Research Unit
> School of Medical Sciences
> Faculty of Medical & Health Sciences
> The University of Auckland
> Private Bag 92019
> Auckland 1142, NEW ZEALAND
>
> Tel: 64 9 923 7438
> Fax: 64 9 373 7484
>
> http://www.fmhs.auckland.ac.nz/sms/biru/
>
>
> -- 
> ------------------------------------------------------------
> Steffen Dietzel, PD Dr. rer. nat
> Ludwig-Maximilians-Universität München
> Biomedical Center (BMC)
> Head of the Core Facility Bioimaging
>
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