[Mr Jack Martin]

Following Owens excellent talk last night here are links to a book and app I referred to in Q&A.

https://www.springer.com/gb/book/9783662103920?token=sba20&utm_campaign=3_fjp8312_springer_gbp_shopping_sba20&gclid=EAIaIQobChMIjr2oyefi6gIVRrTtCh26zwn0EAQYAiABEgL1t_D_BwE

https://play.google.com/store/apps/details?id=com.vitotechnology.StarWalk2Free&hl=en_GB

I noted the many references to Spectroscopy !

Clear skies,

Jack

[Mr Jack Martin]

Astroshot,

What do you use the secure the eye bolts, can see something but not in detail ?

Regards,

Jack

[Mr Jack Martin]

Roy,

Thanks for the link, very informative.

Regards,

Jack

[Mr Jack Martin]

Astroshot,

Ingenious ! how long and what thread are the eyebolts ?

Regards,

Jack

[Mr Jack Martin]

Andy,

I don’t mind at all.

I thought Schmit C’s suffered from this, there was an issue with focussing, after winding the focussing knob backwards and forwards a few times (which has to be done regularly), spectra are much sharper, perhaps it was that.

Regards,

Jack 

[Mr Jack Martin]

Xilman,

Thanks for your feedback.

I have an Atik 314 mono attached to the 4 inch refractor, so the filter you recommend would be a good option, as I want to obtain research-quality results.

I have a Canon 400D DSLR, but from your description, the first option seems more straightforward.   

Regards,

Jack

[Mr Jack Martin]

Robin,

Thanks for your efforts.

Regards,

Jack 

[Mr Jack Martin]

David,

These bolts were not supplied with my previously owned C14.

I just have the 2 transport locking bolts 1″ long.

Rother Valley optics cannot obtain these accessories. I will try 365 Astronomy.

Regards,

Jack  

[Mr Jack Martin]

Thank you all for your responses which filter(s) do you recommend and from where ?

Regards,

Jack

[Mr Jack Martin]

Peter and Daryl,

Thanks for your replies.

Jack

[Mr Jack Martin]

Martin,

I looked through his note book at the RAS some years ago, saw the drawing and notes on his discovery of the great white spot on Saturn. A very accomplished amateur astronomer.

Regards,

Jack

[Mr Jack Martin]

Ray,

Its got nothing to do with PC.

Not sure where you get that idea from !

Jack

[Mr Jack Martin]

Nick,

I agree, its important to get the balance right.

Carolin Crawfords input to the program is excellent.

Clear skies,

Jack

[Mr Jack Martin]

Bill,

Good work, well done.

Jack

Essex UK

[Mr Jack Martin]

The scene at 03.57 UT.

Clear skies,

Jack

Essex UK

[Mr Jack Martin]

The state of play this morning in the pre dawn sky 04.21 UT, the 3 planets are starting to align.

 Regards, 

Jack

[Mr Jack Martin]

Thanks for your comments I should have added taken with my Canon PowerShot G7 MK3, F2.8 1/8 sec ISO3200 hand held leaning out of my bedroom window.  

Regards,

Jack

[Mr Jack Martin]

Here’s my effort from Rayleigh Essex, nearly 1 hour before, as Damien asks please let us know if the pics are valid for your experiment.?

Regards,

Jack

[Mr Jack Martin]

Due to dimming, is it changing its spectral type ?

Regards,

Jack

Essex  

[Mr Jack Martin]

Thank you all for your explanations, its now clear and correct as to when this is.

But, I can see why others would disagree.

It also depends on your level of knowledge about the subject, which is after all of Astronomical significance.

Regards,

Jack

Essex UK

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