Uwa 11-24

[Kayaker72]

I will await test results, but, another thought on the 11-24 f/4, it may be a great starscape lens. If you follow the 500/ focal length rule of thumb, that is a 45 sec exposure before you start seeing star trails. So, a bit less than a 1/2th stop more light than I get with my Rokinon 14 mm f/2.8 (or the Nikon 14-24) or a bit more than a stop of light compared to a 24 mm lens.

[conropl]

...another thought on the 11-24 f/4, it may be a great starscape lens. If you follow the 500/ focal length rule of thumb, that is a 45 sec exposure before you start seeing star trails. So, a bit less than a 1/2th stop more light than I get with my Rokinon 14 mm f/2.8 (or the Nikon 14-24) or a bit more than a stop of light compared to a 24 mm lens.

I do not know if I would go that far. For my 24 mm, the rule of thumb says I should max out at 21 seconds. For stars I would usually shoot 24 mm at 24 seconds, f/2, and ISO 3200.

Assuming the same ISO, your calculated shutter speed is one stop higher, but the two full stops lower in aperture value. I think it is going to be a little dim.

Even with your example, it needs a 1/3 stop more shutter speed than your Rokinon, but has 1 full stop less light getting through the aperture.

If you could make it work, it would be borderline. Having said that, I not implying everyone would want an exposure just like I do it, and lower exposure may very well work for someone else. However, you would leave yourself with very little room for adjustment to changing conditions or light pollution.

Pat