Another mention, a Barlow of decent quality gives you twice the lens. If you have a 20mm lens and Barlow no point in getting a separate 10mm lens but many people will disagree with this logic and I have 20mm, 10mm, 5mm and Barlow so that probably makes me silly. I bought individual lenses before I could get the Vixen 2 times Barlow.
It boils down to how much you can afford to spend.
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