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Why is the Nikon 70-300mm f/4.5-5.6G ED IF AF-S VR twice as costly as Nikon 55-300mm f/4.5-5.6G ED VR AF-S DX?

I'm looking for a telephoto Nikon lens for my D7000 and have it nailed down to either the AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR or AF-S VR Zoom-Nikkor 70-300mm f/4.5-5.6G IF-ED.

The 70-300 is priced close to 50% higher than the 55-300, is this good value for the money as it can be made with less glass due to being DX? Or will I really just get less in terms of optical quality, VR and build quality?

I don't care much about the wider range for this lens, so the difference between 55 and 70 is not relevant. Although I currently have a DX body, having a FX lens would be a plus if the FX bodies come down in price in a few years time.

marked as duplicate by dpollitt, MikeW, fahad.hasan, mattdm, Rowland Shaw Mar 4 '12 at 10:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • The accepted answer on the other question is that one is DX and one is not, which is already in my question. I'd like to understand how big a part the DX/FX difference makes and how much are other factors (and if so, what those other factors are). – SoftMemes Feb 28 '12 at 20:21
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    @Freed, I voted up dpollitt's comment because my response in that thread is a little more informative. If you need more info, I'm happy to update my answer on that question. – Dan Wolfgang Feb 28 '12 at 20:26
  • @Dan, thank you. Ultimately it comes down to "is it worth it" considering that I currently use a DX body. I know it's a question without an objective answer but any additional information would be appreciated. – SoftMemes Feb 28 '12 at 20:30
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    We already have at least a half dozen questions outlining full frame in comparison to other formats such as DX/FX, see this excellent example (photo.stackexchange.com/questions/3986/…). As for the 70-300 and 55-300mm Nikon comparison, the other question is a duplicate. If the existing answers don't give enough detail, then a bounty should be started to encourage new, better answers :) If this thread stays open, it is just going to need to be merged with the duplicate. – dpollitt Feb 28 '12 at 20:32
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    So it sounds like you are more leaning towards the question about the formats. This would be the answer for Nikon - photo.stackexchange.com/questions/840/… and this would be for Canon - photo.stackexchange.com/questions/18891/… This question could probably stay open and you could get specific about each lens "should I get DX or FX" on lens 1&2, 2&3, 3&4, etc - or that same information can be generalized into the existing answers above. – dpollitt Feb 28 '12 at 20:49