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FIELD FLATTENER YES OR NO

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8 replies to this topic

#1 DENISANNA

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Posted 19 November 2019 - 01:07 PM

Hi, want to ask the community if I need a field flattener for my recently purchased "WILLIAM OPTICS APO DOUBLET ZENITHSTAR ED81" I plan on just viewing for now and hope I will eventually get into astrophotography, if anyone who knows a thing or two about this situation, I would be grateful to hear from you

THANK YOU



#2 photoracer18

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Posted 19 November 2019 - 01:17 PM

Field flatteners are for astro-imaging not visual. Camera plane is flat but the human eye is not.



#3 petert913

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Posted 19 November 2019 - 01:30 PM

Yes, a flattener is only needed for astro imaging.   Any scope at f/7 of below would benefit from a field flattener (for astrophotography).



#4 Paul Garais

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Posted 19 November 2019 - 01:39 PM

YES

#5 sg6

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Posted 19 November 2019 - 01:44 PM

Yes.

You will want one eventually, or even immediatly.

 

Is there a dedicated WO one having a name like "Flat 81".

Then again that is what they called the dedicated one for the GT81. I know as I have both GT81 and flattener.



#6 Stelios

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Posted 19 November 2019 - 01:48 PM

You don't need (or particularly want) it for visual. You do need it for AP. 


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#7 rk2k2

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Posted 19 November 2019 - 04:09 PM

For me it would be, don't buy it until you KNOW you will be getting into AP (even though I rarely take that advice).  By that, I mean you've tried a few sessions and at least dabbled with some post processing enough to decide you really want to dig in to AP.  After a handful of late night sessions till 3 - 5AM and feeling like crap the rest of the day (these old bones need their rest), I have yet to decide will I really continue digging deeper into AP enough to justify replacing my mediocre equipment?  My brain says absolutely but my 'day after' says so far- Nope!


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#8 Peregrinatum

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Posted 19 November 2019 - 05:35 PM

yes for AP, and it will have it's own back focus distance



#9 nimitz69

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Posted 19 November 2019 - 06:35 PM

Only required for AP - save your money until you decide to get into AP




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