D50: moon shot with blue shadow

[Karmin]

Hello, yesterday I shot the moon (quarter) using long exposure. I was surprised to see their is a prominent blue shadow in every photo taken. The lens is a Sigma 70-300 APO. I shot in manual full zoom (300) at 5 seconds and f5.6. If I remember well, I shot at the moon with the kit lens 18-55 and it didn't do that. Can someone help me with this please. Defective lens or defective photographer?Thanks Germain

[keith1200rs]

It is caused by internal reflections in the lens due to the massive overexposure. The moon is very bright. Try spot metering on it. You should end up with a shutter speed of something like 1/250s or faster! Here is one at 1/500s f5.6.

Keith.

Karmin wrote:

Hello, yesterday I shot the moon (quarter) using long exposure. I was surprised to see their is a prominent blue shadow in every photo taken. The lens is a Sigma 70-300 APO. I shot in manual full zoom (300) at 5 seconds and f5.6. If I remember well, I shot at the moon with the kit lens 18-55 and it didn't do that. Can someone help me with this please. Defective lens or defective photographer?Thanks Germain