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Old 19-06-2022, 06:21 PM
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chrisp9au (Chris)
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WO Megrez 90mm field flattener question/recommendations

I have a WO Megrez 90mm (FL 621mm - F/6.9) in transit, should be here tomorrow.
Will be using an ASI294MC and am wondering which field flattener to look for?
Thank you
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Old 20-06-2022, 10:47 AM
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Bit of a minefield when it comes to Reducer/Flatteners for William Optics scopes I've found over the years. You may have already googled Megrez flatteners and possibly found a lot written about them on Cloudy Nights, Stargazers Lounge etc. and my overall impression is that is a hit and miss affair. I currently have a Megrez 110mm and bought the WO AFR-IV 0.8x R/F IV which doesn't come to focus (not enough inward travel) but I believe it is suitable for the Megrez 90. I've heard that the TeleVue TRF-2008 RF works so it may be worth researching some more. I also noticed in the Megrez 90 instruction manual that an RF is not shown, see https://williamoptics.com/download/support/megrez90.pdf

Last edited by UniPol; 20-06-2022 at 11:19 AM.
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Old 20-06-2022, 11:12 AM
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chrisp9au (Chris)
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Mmm, I have the WO Megrez 90 manual that just says a field flattener is highly recommended, but no recommendations.
Thank you for responding, I will continue researching!
I might also raise thread on Cloudy Nights.
Cheers
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Old 20-06-2022, 11:23 AM
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I forgot to mention also Chris is that it appears that the focal lengths of some WO scopes including the Megrez 90 are overstated, one example I read somewhere was 570mm instead of 621mm, maybe this is why some RF's don't work?
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Old 20-06-2022, 11:48 AM
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I've read that also, but only on one CN thread.
I'll wait for the scope to arrive and check it out.
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