Archive for category Sun

Solar Spots with SV 90 Raptor and Baader Solar Film

Date: 9/26/2010

Location: San Bruno, California

These pictures were taken with the Baader Solar Film and my DMK black and white camera.

Sun granules and faculae are featured in respectively the first and second pictures

The Stellarvue SV90 (3.5″) is a fine instrument for Sun white light Astrophotography.

It reaches temperature equilibrium quite fast – and with its great optical quality it can get as far as a 3.5″ aperture can possibly go…

In addition I used a Televue x5 Powermate. Since the SV90 has a relatively short focal ratio (f/d 7) the x5  powermate is necessary to get high resolution pictures.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Processing:

– Avistack

– Photoshop CS4

– Astraimage Wavelet filter

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Solar astrophotography

With the home made solar filter I made with the baader solar film  I took some pictures of the sun, with my Orion StarShoot Solar System Imager II and  the Orion 102 premium refractor on the 11/15/208 at 11.15 am PST.

Solar activity is not great these days,  making things more challenging …  I can remember days where giant sunspot complex where visible with the naked eye.

Shooting the Sun with a Solar filter is not an easy task. Dust speckles on the digital camera show up as you can see here on the below picture – at the right of the sun spot.

15112008_sun_speckle3

It is critical to take flat field pictures and use software like Max DSLR to substract the flat field image from the Sun spot pictures to get higher quality images.

After image processing here is the result. Notice the granulae, sun spot, and faculae around the (small)  Sun spot.

15112008_sun21

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