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The V2 of the flattener was about $250 and the V3 around $280 last I checked.. Which is better? Depends who you ask. T-shirt/plastic bag flats should be taken pointing at a diffuse light source. A white/pale colored wall illuminated by a light should work ok.. A lot of people take them just pointing the scope to the eastern area of sky just on sunset, this provides good light, with minimal gradient due to the sun...
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