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On my very amature deepsky photographer point of view Stefan, my collection has been decided apon for three main reasons,
1) Speed, for example, F/4 is very good, as this shortens the Image time , hence reduce noise buildup on the chip, longer focal ratio's means longer exposures, hense lower signal to noise ratio !
2), Focal Length, shorter F/L's for large targets, longer F/L's for smaller targets
3) Last but not Least, Price; Example, Short $ signs for me, Long $$$$ signs Not for me Lol ,,
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