I saw both Discovery and the Enterprise being flown into the area- both times out in my car, looked up and there was the Space Shuttle. When I was a kid, saw them fly in the Ford Trimotor. My Brother and I were out flying model planes at the time, we both recognized it immediately.
The V1- It is well behaved, highly corrected for spherical aberration. Some might call that flat. It's nice to have options. I found one design flaw with the V1: The retaining ring for the second group can come loose. It must be tightened below the ridge of the barrel that surrounds it. It you use standard lens spanners with flat tips, it does not go in far enough. I found using extra fine needle-nosed pliers worked well, never had a problem since.
The V1- It is well behaved, highly corrected for spherical aberration. Some might call that flat. It's nice to have options. I found one design flaw with the V1: The retaining ring for the second group can come loose. It must be tightened below the ridge of the barrel that surrounds it. It you use standard lens spanners with flat tips, it does not go in far enough. I found using extra fine needle-nosed pliers worked well, never had a problem since.
