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Use Borg 100 f4 and f6.4 for visual use?

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#1 nof

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    Sputnik

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Posted 16 July 2019 - 03:01 PM

Hello,

I have a Borg ED f/4 that is convertible to an f/6.4. I used this with a 6x7 film vacuum back for many years for photography and then for a time with a cooled CCD astro-camera. I find the whole digital astrophotography thing a bit cumbersome, too many cables and too much software. But I have my home observatory in a suburban location and thought this refractor might be nice to use for viewing, especially in the f/6.4 640mm configuration (though I need an adapter that I'm looking for to use the f/6.4 configuration with eyepieces, so I posted "Wanted" just now in classifieds). 

 

My question: since this wasn't really designed for visual use, it's a bit clumsy. Would I be better off selling this set-up to someone who might use it for photography and then purchase a decent refractor designed for visual use with the money? If so, what size and focal length should I consider? I have a good mount - an AP Mach 1 - but I need to keep in mind that I'm not going to drag this thing to a dark-site so it will be used only in suburban skies.

Thanks!



#2 SeattleScott

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Posted 16 July 2019 - 03:38 PM

If it actually performs like a true F6.4 ED then it would be tempting. For GoTo operation in a light polluted environment I would sell it and get something bigger though. The appeal of small Apo is something small and light that you can pull out in a moments notice. Putting a 4” Apo on a Mach 1 tends to defeat the purpose of having a 4” Apo, unless you are imaging.

Basically if I’m going to drag out a Mach 1, and do a GoTo alignment, I’m going to put a decent size scope on it. The wide field capabilities of the F4 or F6.4 would be somewhat wasted in the city on a GoTo mount.

Scott
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#3 nof

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Posted 16 July 2019 - 10:38 PM

So what kind of refractor would you recommend for use in suburban skies? When going to dark skies I take my 10” f5 reflector. At home I have a choice of a Meade 8” sct and a 12” goto reflector. What refractor would be a good addition to this combo?
I did enjoy views the other night of M17 and M18 together in the same field even though the sky was not black


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