jethro779 Loc: Tucson, AZ

Bob, the D7100 will focus af lenses, the D5100 does not as far as I know.

yssirk123 Loc: New Jersey

Sorry for your loss.

Of the 3 camera bodies, I think the gem is the D700. Definitely use it before you do anything. The D700 has a great sensor and image quality, and don't let the 12MP hold you back. I've made 20x30 enlargements from a 12MP D3S with no problem.

ClarkJohnson Loc: Fort Myers, FL and Cohasset, MA

You could convert the D5100 to infrared. I have not had the opportunity to do this, but Reed Hoffman (Nikon school) suggests this as a fun thing to do with older bodies.

mas24 Loc: Southern CA

The D7100 has the internal focus motor, the D5100 does not. The D7100 has dual SD memory cards, the D5100 does not. The D700 is the first full frame camera that I saw on display, at a camera shop in late 2008. It had 12.1 megapixels, which was a lot back then. It was unaffordable for me at that time. Although, it only has 12.1 megapixels, as compared to today's cameras. It is still a very good camera. I have heard of photographers saving manual lenses that have fungus inside them, by purchasing a special screwdriver tool kit, and taking the legacy manual lenses apart, and cleaning out the internal fungus. An autofocus lens would be even more difficult to do. You have to really know what you are doing, to take on such a task. Call Nikon about seeing if your lens can be cleaned out. As mentioned earlier, fungus can grow, so keep it away from the other lenses. Humidity, such as in summertime Florida, continuous raining weather, like in North Coastal Washington State, that causes dampness, and later condensation, are the initial causes of fungus. It can also get inside a DSLR as well. Keep your camera gear in a dry area for safekeeping. The best choice for me would be the 24 megapixels D7100. You can use Nikon full frame lenses on a Nikon DX crop sensor DSLR. But some require the tnternal camera focus motor to work completely.

BuckeyeBilly Loc: St. Petersburg, FL

My situation is too long to explain but, if you're able to sell me the D5100, I would take it in a heartbeat. I had one until it got stolen and I'm not a homeowner and had no insurance to file a claim. But the D5100 was my very first DSLR and I loved it! Haven't been able to afford another one. Please Private Message me. Thanks.

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

IMHO, Sell the D5100, and put the 24-70 on ebay with disclaimer that their is mold on interior glass.
The D700 is a full frame camera that will work very well with the 24, 28, and 70-200.
The D7100 (is a cropped sensor camera, smaller sensor than the one on the D700) matches up well with all three of those 24,28, and 70-200 lenses, but the 55-200, and 18-55 will work fine with it, they are both "kit lenses" but will deliver good results.
The three lenses on the D7100 will deliver the following field of view, the 24 becomes a FOV of 36mm, the 28 becomes a FOV of 42mm, and the 70-200 becomes a FOV of 105-300mm. These three lenses are very good and should work very nicely on either camera.

mborn Loc: Massachusetts

I agree also

Delderby Loc: Derby UK

Your brother has left you some great equipment. It is difficult to advise you what to do without knowing your level of photographic expertise or aspirations. I am not a Nikon man, but I have read so much about them I feel I know them. MHO is - keep the D7100 and immediately if not sooner remove the 24-70 F2.8 and do with it as already described by other Hogs in this topic. Keep it away from the rest of your equipment.

camerapapi Loc: Miami, Fl.

He left you a full frame camera and two cropped bodies. In my case I would keep the D700 and D7100. If you decide to use only one and you are not into action or wildlife photography the D700 will serve you well.
The 18-55 and 55-200 are the only lenses you have that can use the full sensor of your D7100 and D5100. The other lenses go better with the D700 not meaning you cannot use them with the two cropped cameras. I do not recommend to use the 18-55 or the 55-200 with the D700.
The 24-70 f2.8 is a professional lens like the 70-200. If mold has not caused severe damage to the coatings it is worth it to repair it. Be prepared for an expensive bill since it could require a complete overhaul. That lens is of excellent optical quality and a favorite of professionals.

The primes you have are all very good lenses too. The 24-70 replaces them all. One big advantage of using a zoom is that exchanging lenses is not necessary within their range of focal lengths which could be a godsend when it comes to not missing an opportunity.

Delderby Loc: Derby UK

Reading what you say, would it be best for the OP to keep the D700 plus the 70-200 plus the 24-70, financing it's repair by selling on some or all of the rest of the equipment?
OR keep the D7100 and 18-55 and 55-200?
Would the primes and the D5100 pay for repairing the 24-70? This would leave the OP with a FF kit and a DSLR kit? He could then take time to decide to keep both or either.

xt2 Loc: British Columbia, Canada

Sell, and purchase a brand new mirrorless and be way ahead of the tech curve.

Cheers!

camerapapi Loc: Miami, Fl.

I cannot take decisions by the OP. I do not know the status of his 24-70 lens. I agree that his D700 and the combination of 24-70 and 70-200 would make a great shooting combo. His D7100 with the kit lenses is not a bad combination either but a combination that will not last long since there is something in us wanting to upgrade to better glass.

We are all different. The final decision on what to do or what to sell is up to him.

dandi Loc: near Seattle, WA

I have experience with two of your cameras. D700 and D5100. I really loved my d5100 and regretted when I sold it. It has a very good 16mp sensor. I wish Nikon would still make DX cameras with 16mp. Fully articulated screen on D5100 could be very helpful. Excellent camera for traveling. I would probably replace your 18-55 and 55-200 for 18-140 or 18-200. I am using now 18-140 - very good lens. Shoot for some time with both cameras (D7100 and D5100) and see what you prefer.
As for mold in the lens. I would do my best trying to fix/clean the lens. Go to your local camera store, some stores offer repairs. If not they will advice you what to do. In a meantime remove any filter from the lens and exposed the lens to sunlight for a few days.
I still use my D700 and have no desire to replace it with newer camera. Do you know what is the shutter count on the camera?
With D700 + 24-70 and 70-200 you are ready for almost everything. Fixing your 24-70 would be the only expense and after that you’ll be all covered.

n3eg Loc: West coast USA

And don't forget the FTZ adapter!