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<blockquote data-quote="Don Kuykendall_RIP" data-source="post: 527535" data-attributes="member: 6277">This was shot with my D7100 using the Tokina 11-16 @16mmISO 3200f.2.815sec exposure15 seconds is about as long a shot as you can do. Anything longer the stars start to move and they will not look as sharp.&nbsp; I played with this a lot and 15 was max. Many people will tell you that they go longer but if you zoom in to their shots you will see lines and not dots for stars. Here is where you will run into problems with the lens you have. The fastest it will go is 3.5 so since you can not use a longer shutter speed because of star movement you would have to increase the ISO to 6400 to make up the difference in the aperture. With your camera that would be very grainy. Getting a much faster lens would be what you would need to do. Using a f1.8 lens would allow you to lower the ISO to 1600 which would be much better.&nbsp; Not telling you that you can't shoot with what you have or to go buy a new lens but instead showing you what the differences in aperture does to your shot.</blockquote>

[QUOTE="Don Kuykendall_RIP, post: 527535, member: 6277"] This was shot with my D7100 using the Tokina 11-16 @16mm ISO 3200 f.2.8 15sec exposure 15 seconds is about as long a shot as you can do. Anything longer the stars start to move and they will not look as sharp. I played with this a lot and 15 was max. Many people will tell you that they go longer but if you zoom in to their shots you will see lines and not dots for stars. Here is where you will run into problems with the lens you have. The fastest it will go is 3.5 so since you can not use a longer shutter speed because of star movement you would have to increase the ISO to 6400 to make up the difference in the aperture. With your camera that would be very grainy. Getting a much faster lens would be what you would need to do. Using a f1.8 lens would allow you to lower the ISO to 1600 which would be much better. Not telling you that you can't shoot with what you have or to go buy a new lens but instead showing you what the differences in aperture does to your shot. [/QUOTE]

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