| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4424 |
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25mp is widely believed to be the current sweet spot for sensors.
The bigger the pixel the better the quality. It therefore follows that a 25mp FX sensor will be better than a DX 25mp sensor.
However if you go FX, remember you will lose reach but gain wide angle...you may have to think your glass to match your current range.
I wouldn't buy a D500 for portraits....it's forte is wildlife and sports.
I've got a D750...it's sensor is sharper than the D3 I had previously. It also is the best Nikon camera I've had in low light. The handgrip is also the best designed of all nikons. Imho
I haven't used a D810, but the extra pixels on the sensor mean you need to be more careful with technique to capitalise on its detail. This becomes more relevant when you come out of the studio and use it walking about handheld! So you need to consider WHERE you will be using it.
FX sensors have shallower depth of field than DX at same focal length...something to bear in mind when composing your images.
The lenses you have are great...but I wouldn't use them wide open for portraits.
More importantly, what do you think is wrong with your images? In what way do you need to improve them?
You don't mention lighting. Strobes and creative lighting can really make portraits zing. So you may want to consider getting the right equipment around the camera before abandoning the D7100.
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Eric