My all-time favorite manual flash for the Leica is the Fujifilm XF-20X but when I want a quick grab and go TTL flash… I was testing the Leica SF24D and the Leica SF26. For the price difference, the 26 will work great and give me what I want. The 24D is a great little flash, but at almost double the price I just can’t justify the cost.
When I need more power but want to stay on camera - the i40 fits the bill.
Equipment I use and love.
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