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(A really well made pier and adjustable wedge. 780mm high pier plus the wedge obviously :).
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Over the course of one or more training periods your LX90-ACF will minimize guiding corrections during long exposure astrophotography. Image brightness is increased by nearly 15% over standard coatings.
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The effect of the filter is that nebular light reaching the eye is observed visually in dramatically increased detail, while the effects of unwanted city lights are greatly reduced.
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The guide rings are 6".
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A very good quality Off axis guider with built in reducer.
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