Sun FD in H-Alpha and CaK 3rd of June 2021

[arnedanielsen]

Dear friends,

A short session yesterday to grab FD images in H-Alpha and CaK.

FD image in H-Alpha using the Takahashi Sky-90II with Coronado 90mm/BF15, Coronado 2x CeMax and ASI 1600mm PRO

Sun90FD_113040_Ha_(Coronado_90mm_BF15)_20210603_ZWO ASI1600MM Pro_lapl4_ap7553_Sharpened_Contrast_resize.jpg (446.11 KiB) Viewed 247 times

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FD image in CaK using William Optics ZenithStar 61II, Lunt Cak 1200 module ASI 178mm

Sun60FD_103509_CaK_(3934nm)_20210603_ZWO ASI178MM_lapl4_ap2837_Sharpened_Contrast_resize.jpg (215.31 KiB) Viewed 247 times

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Sun60FD_103509_CaK_(3934nm)_20210603_ZWO ASI178MM_lapl4_ap2837_Sharpened_Contrast_Colorized_resize.jpg (231.94 KiB) Viewed 247 times

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Best regards,
Arne

[marktownley]

Nice shots Arne!

I have the same 60/f6 scope as you, stop it down to 40mm for CaK you will significantly improve the quality of the full disk. This scope full aperture at 393nm has a LOT of spherical aberration.

Mark

[Montana]

Superb full discs Arne I agree with Mark, I have to stop down my TEC140 because of the spherical aberration too

Alexandra

[arnedanielsen]

Thanks and thanks for the tip Mark! I will definitely try this.

Best regards,
Arne

[EGRAY_OBSERVATORY]

Well done on the SPOD Arne and I just love your Cak images.

Thanks for sharing
Terry

[arnedanielsen]

What a wonderful surprise!

Thanks for your kinds words, Terry!

Best regards,
Arne