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flip mirror and newtonians?

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#1 in_the_quiet_wood

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Posted 19 March 2018 - 05:49 PM

I know flip mirrors typically don't work with newtonians because of need for too much backfocus.  Does anyone know if using a barlow will fix this?



#2 junomike

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Posted 19 March 2018 - 06:00 PM

It might (or not).  What's the purpose of it (needed)?



#3 in_the_quiet_wood

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Posted 19 March 2018 - 07:51 PM

I'd like to do planetary photography and I'm having trouble getting the planet in the field of view, using Celestron Neximage5 and barlow.

 

Now don't laugh: I'm using a 12" dob on an equatorial platform, so it's already a challenge getting things precisely aligned (very touchy), but I think I can manage that if I can just find the planet.  I've read other topics where people swear by using a flip mirror, but I assume they're using SCT's.

 

I know people swear you can't do astrophotos on dobs, but I've seen good results. 




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