Tuesday, December 9, 2008
Some new eyepieces
The title is true in more ways than one. Since last posting I've had cataract surgery on both eyes, the last being on Dec 5 2008. I specified the multifocal Restor implants against all advice from various astronomer colleagues but am happy with the results so far. My distant vision is about 20/30 without glasses which, for someone who has long been unable to see the big E without glasses, is pretty good. Near vision is good and I can read the fine print on sugar packages. Contrast sensitivity isn't great but not bad and seems to be getting better. Glare isn't a problem either. I had a chance to use my 8" dob over Thanksgiving break back in Missouri and it was pretty good even with just one eye (the right eye hadn't been done yet). I was able to compare vision between the Restor lens and my natural lens. I estimated that the Restor cost me about a half magnitude or so but otherwise was ok. Back in Texas and after completing surgery on the right eye I took out my trusty ETX-70 on a clear night. I wanted to check out my 10 and 25mm Orion eyepieces with the ETX. The 25mm and 3x Barlow require too much refocusing to be of much use with the ETX but the 10mm Orion and 27mm Meade are nearly parfocal and should be good companions. I checked out the starfield around Alnath and then went to M45. I was able to clearly see 8.3 mag SAO76191 with the ETX and didn't notice any appreciable difference between sessions before and after surgery. Only a day after surgery on my right eye I was able to make out individual stars in M45. They weren't quite clear enough to count but it's been a long time since M45 unaided was anything more than a fuzzy blob in the night sky!
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