From: Wolfgang Heinemann-Reiff <wreiff1@t-online.de>

Date: May 21, 2015 1:27:42 PM MDT

To: <Astro_IIDC@yahoogroups.com>

Subject: Re: [Astro_IIDC] IR Cut Filter Necessary?

Hi Kevin,

recently I bought a Grasshopper 3 monochrome USB 3 Camera GS3-U3-23S6M-C.

I think that’s the one you are considering. This is imho a good decision.

This camera does not need an extra IR-Cut filter. The technical data (which you probably have studied) are excellent concerning QE and noise.

What it needs though is a fast computer with USB 3 ports and fast (SSD) Harddisk in order to cope with the 162 Frames per second the camera will deliver.

However, I’m attaching a quick and dirty first trial image in order to let you see what to expect.

Best regards

Wolfgang

Am 21.05.15 18:36 schrieb "fsm79734@gmail.com [Astro_IIDC]" unter <Astro_IIDC@yahoogroups.com>:

I do only solar imaging, and I'm about to purchase a PGR USB3 camera to use with my Lunt 60mm H-Alpha pressure-tuned solar telescope.  I have a few questions for those of you in the group who do this type of imaging.

First, is an IR-cut filter necessary?  Doesn't the filter in the Lunt already do this?  In my past discussions with vendors, they have recommend them - possibly with the intent of selling me a $73 filter - although I've never done a side-by-side comparison.

Secondly, any thoughts on the PGR Flea3/Chameleon3/Blackfly/Grasshopper3 relative advantages/disadvantages for solar imaging?  All of the above cameras I'm considering are the ~2 megapixel, monochrome variants.  In particular, I've never used a CMOS camera for imaging before, only CCD cameras.

Any suggestions are appreciated - thanks!

-Kevin