Lunar eclipse practice

[rumples riot]

Just practicing for the lunar eclipse. The teleconverter works great except for some fringing I am getting which I have removed. This is an 800 pixel crop of a much larger image. The full size image is giving me too much pin holing. I have to try and find out what the optimum f number is for this new configuration. Quite happy with the image though, just want to get it right before the event.

[Dennis]

That's a very nice image Paul, but what is "pin holing"?

Cheers

Dennis

[rumples riot]

Actually I mean't Pin cushioning. Each zoom lens has an optimum focal length and f stop for its construction. In the 80-400 VR Nikon lens I am using the optimum is f11 at 400mm. Now that I am using a 2x teleconverter I am not sure which way to go. I suspect that the range will be close to f 5.6 at 800mm. The reason I say this is that the lens in its native form tends to get ban pin cushioning at around f22 at 400mm I even found that at f18 last night I was starting to get some.

Thanks Dennis for the comment.

[RB]

It's a nice image Paul, the only thing is that you need to play with the levels to bring out the detail since you're shooting at f/11, it looks a little dark.

[Dennis]

Thanks for the explanation Paul. Good luck with the experiments and perhaps more importantly, clear skies to all of Australia, and NZ of course!

Cheers

Dennis

[Ingo]

All lenses exceed at around F7.1-F18. With the teleconverter you may want to go down to about F11-F15.