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Originally Posted by janoskiss
The GS 2" 26mm probably has a bigger true field of view that the 30mm 500 (and you probably don't need the 25mm GS either.) But if you can swap one or both of them for different focal lengths, I would go for a 15 and/or 20mm. The 6.5mm will be too short on eye relief to be comfortable and you won't get much use out of it.
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I used to own one of the 26mm GSO's and it was a shocker at f5.
Considering he already has a 12.5mm, the addition of a 15mm plus a good barlow gives two nice planetary magnifications. I dont know why GSO bundles a 9mm with these dobs IMO a 12mm would be much more useful
