Blair Shaw Jr Loc: Dunnellon,Florida

The D750 is a great camera and if you can use all of your lens on either rig , I'd go for the D750 and use both cameras to cover about any situation you might encounter. They both have about the same amount of M.P.'s but the 750 is better in low light conditions (w/higher ISO) and a slightly larger burst rate for sports.

I shoot both Canon & Nikons and love my FF rig so much that I often have trouble deciding which to carry around as the Cropper is lighter & smaller. Any time you can use existing glass and still upgrade is a PLUS for YOU in the long run. In the end I must admit that having the ability to choose is a Priviledge Indeed.

We are blessed to be in such a rewarding hobby as this one is and I have been in many Rodeos.

cameraf4 Loc: Delaware

I would say that 35mm format (FF) digitals had a big advantage over APS-C (crop-sensor) cameras when FF were first introduced. That gap has largely closed by 2019. I love my FF/FX Nikons but my major reason for buying them was because I already had several 35mm format Nikkor lenses. If you don't, then you can save some coin and "lighten your load" by going with a D500 and keeping your Tamron until you can afford some Nikkors.

Maik723

The Tamron 18/400 will not work on a full-frame camera. However, full-frame should be your next progression. Get it and don't look back (but keep your APC).

jerryc41 Loc: Catskill Mts of NY

The D750 is a great camera. The 28-300mm is my go-to lens for my D750.

DX/FX -
http://www.diyphotography.net/crop-vs-full-frame-sensor-different-cameras-perform-lens/
http://www.nikonusa.com/en/learn-and-explore/article/g588ouey/the-dx-and-fx-formats.html
https://www.borrowlenses.com/blog/new-dslr-owners-what-you-must-know-about-full-frame-vs-crop-frame-sensors-before-choosing-a-lens/
http://www.bhphotovideo.com/explora/photography/features/dx-vs-fx-its-not-debate-its-choice
http://www.lightstalking.com/cameras-sensor-size/
http://neilvn.com/tangents/full-frame-vs-crop-sensor-cameras-comparison-depth-of-field/

SteveG Loc: Norh Carolina

Just this shooter's experience ; I have done the entire route. Every Sony model from crop to full frame. Canon and Nikon. Searching for that image quality that just stands out from the smaller sensor with the full frame. I ended up with an Olympus micro 4/3rds and I couldn't be happier. The quality and amount of glass available, for less money from both Panasonic and Olympus and its incredibly small size makes it so easy to grab and not have a brick hanging around my neck and the image quality, unless you blow up your photos and pixel peep at higher iso settings, hard tell the difference. In body 5 axis stabilization that is unbeatable and keeps your iso low. Up to 2 second hand held shots, if you're steady handed but 1 second, no problem. Can you see the difference between full frame and cropped or M4/3rds? Go to Image Resource Comparometer and you can compare any camera to another. Just be sure you click all cameras. See what you think.
https://www.imaging-resource.com/IMCOMP/COMPS01.HTM
As I started out saying, this is just one guy's experience. I have not regretted going from Sony or Canon full frame for one second. Also, there are a bunch of YouTube videos where you can search out, "Why I don't shoot full frame any more"

ELNikkor

I did that, but am using the 24-120 on the D750. The 28-300 FX would have been my second choice, but the 24-120 came with the package and I love it!

Fotomacher Loc: Toronto

When the equipment is the ONLY THING holding you back from capturing award winning images, THEN it's time to upgrade.

jackm1943 Loc: Omaha, Nebraska

I think it might depend somewhat on what size prints you normally make. If no larger than 11x14, you probably won't notice any improvement provided, of course, that you are using high quality lenses.

Picture Taker Loc: Michigan Thumb

I have a question, why is a full frame an up grade? I have a 7D and a 5D and wanted a full frame also but, got thinking now I use both and think of one a LONG RANGE camera and the other as a WIDE ANGLE camera. Not challenging just realized this as I was reading your blog.

TriX Loc: Raleigh, NC

It’s not big prints, it’s high ISO/low light performance. The pros and cons go like this:

FF advantages:

1) better low light / high ISO performance (typically about 1 stop)
2) thinner DOF for portraits, etc.
3) wide angle without having to go to super wides with the attendant distortion

Crop advantages:

1) lower cost
2) crop factor is useful for long telephoto shots
3) crop lenses are cheaper and lighter

In fairness, regarding number 3, most manufacturer’s premium and specialty lenses (such as T&S) are FF anyway, so no $ and size weight savings if you use them.

Rich1939 Loc: Pike County Penna.

Were I a professional photographer my equipment needs would be based, pretty much, on the practical. As an amateur my needs are very much weighted by the emotional. However when asked for my opinion I try to give good advice but, let's face it most amateurs are also lead by the emotion. If someone they admire uses a certain camera, lens, or accessory, be it a pro or Uncle Ned, that is going to be the direction they lean. Talking them out of it will in the long run fail. Usually they will eventually take the leap because going against their instinct felt wrong. Unless it appears to be a really bad decision talking them out of their choice is a disservice in that it will cost them more in the long run. Particularly if they're leaning towards something that is better than what they have no matter how little bit better it may be, save them the expense of buying twice.

Rich1939 Loc: Pike County Penna.

I don't see #2 on the crop advantages as being factual as you can frame with a FF to create the same subject size and crop in post. In fact at least with Nikon, you can select image area in camera.

ptk Loc: Oregon, USA

I made the switch from a D5300 (crop sensor) to a D750 (FF) about a year ago. You have been getting good general advice here, so I will only cover my specific reasons for the change, and my own observations. Here are the top reasons I changed:

First, the D5300, was not as easy to use with my older film lenses (it was my first DSLR; my research missed this point). I could only use them in manual mode. The D750 will let me tell it the focal length and widest open f-stop to use metering and focus assist.

Second, my old portrait lenses had an awkward field of view on the cropped sensor. Their focal lengths are better suited to the D750 as portrait lenses.

Thirdly, the D750 has much more support for taking a series of bracketed photos.

Only the second one has to do with FF versus DX. I could have gone to a D7200 or similar for the first and third reasons. Image quality is not noticeably different. I can autofocus (or use focus assist) in somewhat lower light with the D750. The D750 is slightly larger and heavier, and of course it was more expensive.

In summary, the D5300 had many more features than I ever used, and the D750 has many, many, many more features than I will ever use. But I got the few features I missed in the D5300.

Good luck with your decision!

cameraf4 Loc: Delaware

Oh, wow! Thanks for the link, Steve. Right up the alley of a nerd like me.

mas24 Loc: Southern CA

A friend has the FX 28-300mm lens on his crop sensor D7100. That lens performs well on his D7100. He also wants to upgrade to full frame, just like you. Wanting a D750, and willing to wait it out, for an even lower discount price, when the D760 comes out. Rumored to be announced around July 1st of this year. I would sell my D5500 and 18-400mm lens. Not do a trade in for it.