39EnFrEsRuJpDeItEMA-1(Optional accessory)Attaching a screw-in type Fieldscope eyepiece to an EDG Fieldscope with theEMA-1.Note: It may be quite hard to screw in because of the retention of the O-ring, soensure that it is screwed in tightly.Take care to do this, because if the EMA-1 is not screwed in tightly enough,it will not be airtight.Correctly mounting EMA-1 andeyepiece.Incorrectly mounted EMA-1(not screwed in sufficiently: O ring is still visible.)