How to mount a Nikon D4 or D800 with battery grip (for longer operation) exactly in the NPP on the Merlin when shooting a 360Âº VR with a Fisheye ?
In technical specification, they indicate only 30mm space between bracket and vertical axis.
It is 40mm with a straight rail on my Merlin.
Beyond that you have to start modifying the rail and/or the dovetail clamp. and even then there's limit to what can be achieved.
I'm not sure you could mount a D4 or D800 with or even without a battery grip at the NPP with a fisheye lens on the Merlin/Panogear.
You need to look instead at the upcoming T&C Panoneed or the Seitz VRDrive2 to easily mount a D4 or D800 at the NPP.
Why would you need a battery grip when shooting spherical panos with a fisheye lens?
Battery grips are not recommended when using any type of pano head.
AND finally ...why would you want/ need to use a robotic pano head to shoot a spherical pano using a fisheye lens? It would be faster and more convenient to use a manual pano head.
And in the compatibility list, all Nikon PRO DSLR are listed.
I feel that the term 'compatibility' is possibly misleading here. By 'compatible' I think they mean that it's possible to trigger the camera shutter with a cable between the Panogear mount Snap connector and the camera.
But there are virtually no DSLR fullframe lenses with only 60 mm diameter !
And this shown modification of the crown may not be normal operating procedures ?
Most people use robotic pano heads to shoot hi-res partial panos of relatively distant scenes using longer focal length lenses where the number of images required means that there is a real advantage in using a robotic pano head over a manual pano head. There is typically no advantage in using a robotic pano head to shoot spherical panos using fisheye lenses unless you are shooting from a tall mast or a pole.
When shooting hi-res partial panos of relatively distant scenes using longer focal length lenses it's usually not necessary to attempt to mount the camera/lens at the NPP, because there is nothing in the scne very close to the camera.
In fact when using heavy cameras and long lenses with robotic pano heads it's usually more important to mount the camera/lens close to the centre of mass than to attempt to mount it at the NPP. In which case youj would mount the camera./.lens in landscape orientation on the L-bracket plus straight rail with the camera body behind axis of rotation of the vertical arm of the Panogear mount.