safeman wrote:
Nikon 3700 or 5600? Why?
Impossible to answer without knowing your particular needs or budget. There are also plenty of used models to consider. And if you have high quality full frame lenses, are you sure you want to go do DX format?
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Body only or Kit? (Nikkor 18-55 VR, 70-300 4.5-6.3 Zoom)?
See above - just can't answer from the information given. Maybe consider other lenses than the kit ones, depending on what you like to shoot, how much weight you want to carry, budget, etc. There are some great 18-300mm zooms, including Nikon, Tokina, and Sigma, if you want to go with a body and single lens to start with.
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I have three AF lens that work on my N-70 film Camera: Sigma 28-300D Aspherical IF; 60mm Micro Nikkor f2.8D; 20mm Nikkor f2.8D AF. Will these lens work on either or both of the cameras I'm considering?
Yes, they will all work, but you are looking at the difference between a crop sensor and full 35 format - they will all give a field of view equivalet to approximately 1.5 times the focal length you're used to, using them with a film camera. I don't think any of them will autofocus with either of the models you've said you're considering.
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What is the advantage/disadvantage of a low pass filter?
I can't think of any advantages. Disadvantage is worse low light performance with more noise.
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Realizing this is a dangerous, open ended question, what else do I need to know?
Think about what you want to shoot, what other equipment you'll need (flashes, etc.), and your total budget.
My wife and I made the decision and switch about two years ago, and started on a plan and budget, then followed it through. What was right for us is not necessarily right for you, but I do think it's a good idea to make a plan and try to follow it. Changing systems or gears midway when you think you're headed down the wrong path can get very expensive.
Here's a link to our plan and how we achieved it, in full acknowledgement that what was right for us may not be in your wheelhouse at all. Our next upgrades will probably be to D7200 bodies to get rid of the low pass filters, but we'll see what opportunities come along...
http://www.uglyhedgehog.com/t-526467-1.htmlAndy