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Don Reed | profile | all galleries >> Astrophotography >> DSLR Astrophotography - How It's Done >> Focusing modifications tree view | thumbnails | slideshow

Focusing modifications

The first four images in this gallery show minor adjustments and modifications I have made to my imaging telescope in order to facilitate accurate focusing. The fifth and sixth images concern what I consider to be the single most significant focusing aid available to amateur DSLR and CCD astrophotographers, the Bahtinov mask.
Step 1. Draw-tube tension adjustment
Step 1. Draw-tube tension adjustment		 Step 2. Focus shift adjustment
Step 2. Focus shift adjustment		 Step 3. Fine focus modification
Step 3. Fine focus modification		 Fine focus modification - closeup
Fine focus modification - closeup		 UPDATE! Bahtinov mask!
UPDATE! Bahtinov mask!
Star image seen through the Bahtinov Mask
Star image seen through the Bahtinov Mask		 M15 Again
M15 Again

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