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I have the Baader one for my Sony A6000. I looked at what was available, and wanted the shortest one possible. If, for example, you grabbed that one from Amazon, you've eaten up a lot of potential room in your back focus that you could later have used for a filter drawer etc. For me, the Baader allowed me to place a ZWO 2" filter drawer quite close to the sensor. Food for thought anyway.
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