Posts Made By: Alan Friedman

February 14, 2009 09:27 PM Forum: CCD Imaging and Processing/Solar System

Is it better not to have IR cut filter on planetar

Posted By Alan Friedman

As has been said you can use IR blocked RGB filters for collecting color data or for narrow band imaging. But also a camera that is not blocked for IR (such as the DMK series from the Imaging Source) can image in IR wavelengths with an IR pass filter.

cheers,
Alan

April 23, 2009 02:04 PM Forum: CCD Imaging and Processing/Solar System

Hipparchus & Albategnius

Posted By Alan Friedman

A great image Stefan! I am of the same mind about experimentation when the time for imaging in good conditions is so short. I am very skeptical about there being any advantage to using a blue filter over green given the tdecrease in camera sensitivity and increased atmospheric activity at the blue wavelengths... but go ahead and prove me wrong! 8^)

best wishes,
Alan

April 27, 2009 01:43 AM Forum: CCD Imaging and Processing/Solar System

Saturn with Tethys, shadow and storm in transit

Posted By Alan Friedman

Thanks very much for the nice comments! smile

Alan

April 27, 2009 01:45 AM Forum: CCD Imaging and Processing/Solar System

Venus occultation

Posted By Alan Friedman

A lovely and evocative image - do you have one with Venus separated from the lunar limb?

thanks for posting,
Alan

September 26, 2009 07:19 PM Forum: CCD Imaging and Processing/Solar System

Eventually: NOAA 11026!

Posted By Alan Friedman

It is a rare event to be able to reap the advantage from a large aperture in solar imaging... this is one of those times. A truly remarkable image Luca... and great to see you back imaging again.

best wishes,
Alan

November 10, 2009 04:08 AM Forum: CCD Imaging and Processing/Solar System

Full moon with a Questar 3.5, 11-1-09

Posted By Alan Friedman

Hi Paul,

I think this is a great result from your Questar!!

I opened the image in Photoshop CS3 and ran auto levels on it - then faded the auto adjustment by 10%. This brightens it and removes the greenish hue. See what you think.

cheers,
Alan

November 18, 2009 03:10 AM Forum: CCD Imaging and Processing/Solar System