APO/ED refractors are great, however they do need a flattener to give you those pinpoint stars, or, even better, a reducer/flattener to also give you faster exposures and wider field at the same time. SomeĀ refractors will have a matched reducers (especially the “slow” ones), but, for those that do not the expensive TeleVue TRF-2008 […]
Refractor Reducers: TeleVue TRF-2008 vs Altair Lightwave 0.8x on SW Evostar 80ED & Equinox 80 ED
January 11, 2017 // by ecuador
Celestron f/6.3 reducer/corrector with DSLR on C9.25
March 31, 2016 // by ecuador
Although I got my C9.25 mainly for planets, the fact that my tiny iOptron ZEQ25 mount seems to handle it for longer exposures made me look into using it for DSOs as well. The problem of course is that it is quite slow at f/10, has a very demanding 2350mm focal length and has quite […]