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<blockquote data-quote="bluenoser" data-source="post: 60297" data-attributes="member: 6351">I'm going to assume for now that you are most likely going to need some extra reach in a lens as I'm guessing you might be a bit far removed from the horse action?&nbsp; As such, the most practical solution would be a telephoto, zoom lens.On that basis, to freeze the action to give you &quot;minimal leg blur&quot;, you need a high shutter speed.&nbsp; If you've got lots of available light then the slower variable aperture lenses can accomplish this freeze action.&nbsp; However when your available light starts to drop, then you need a faster, constant aperture lens (which can be quite expensive - you pay for fast glass).&nbsp; Your D5100 can shoot at higher ISOs which will let you &quot;cheat&quot; a bit more and enable you to climb up the ISO ladder as the light falls off in order to keep your shutter speeds up.&nbsp; Of course with most entry level DSLRs, once you start going too high up the ISO ladder, the more noise you tend to introduce into your image.Bottom line:&nbsp; If you have lots of good available light then your options are wide open in terms of good, economical lens choices.&nbsp; If your lighting is not optimal, then your options narrow and get more expensive.</blockquote>

[QUOTE="bluenoser, post: 60297, member: 6351"] I'm going to assume for now that you are most likely going to need some extra reach in a lens as I'm guessing you might be a bit far removed from the horse action? As such, the most practical solution would be a telephoto, zoom lens. On that basis, to freeze the action to give you "minimal leg blur", you need a high shutter speed. If you've got lots of available light then the slower variable aperture lenses can accomplish this freeze action. However when your available light starts to drop, then you need a faster, constant aperture lens (which can be quite expensive - you pay for fast glass). Your D5100 can shoot at higher ISOs which will let you "cheat" a bit more and enable you to climb up the ISO ladder as the light falls off in order to keep your shutter speeds up. Of course with most entry level DSLRs, once you start going too high up the ISO ladder, the more noise you tend to introduce into your image. Bottom line: If you have lots of good available light then your options are wide open in terms of good, economical lens choices. If your lighting is not optimal, then your options narrow and get more expensive. [/QUOTE]

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