Author: tejas
Subject: Premier objective lens set ?
Posted: June/15/2014 at 19:41
Subject: Premier objective lens set ?
Posted: June/15/2014 at 19:41
 Gappa wrote:My Tak FSQ106ED is an ultra widefield astrograph which I also use for terrestrial CCD photography. My TOA 130 is what you call a narrow FOV instrument. So your statement is half-correct. Yes a riflescope does need to withstand extreme g forces but still glass to metal interfaces are common. Lenses are still held in with a threaded lock ring just like a camera. And although the designs vary in how the erector tubes are adjusted for targeting, it's still composed of screws and springs whether it's a 5k S&B or a $50 BSA. I am a mechanical engineer. I have a decent grasp on optics, physics, mechanical design, electronic design, chemistry etc. Am I an optical engineer no. Are you? Fair question. |
I used to play around with astrophotography, I used a DSLR and a Meade AR-6 Achromatic Refractor. I'd probably still do it if I owned a Takahashi and a good GEM. I found the experience frustrating. There was "slop" in the GEM i owned, and I had a hard time getting precise focusing through the tiny viewfinder of a DSLR. That was before I had cataract surgery done though. I did get some spectacular pictures of the moon. If i remember right, i used my Nikon D200, 2X tele converter,1200 mm scope. That gives you roughly 60X when you factor in the plus 50% using a Nikon CCD. I know this is off topic.![]()
