Leonard Shepherd

It is difficult to comment in detail. I like your image, despite the camera not been level. The way autofocus is set differs between the D3s and the D4 and it does take some getting used to. Some...

Any fine tune system is very much dependent on the suitability of the AF target (see camera instruction book), the skill of the photographer, and following the system instructions.

Free View NX2 lets you see the focus points if you need the information.

200mm should be close at infinity focus. At closer focus distances it can vary quite a lot, depending on the lens design.

300 plus 1.4x plus 1.7X gives you 300mm, 420mm and 510mm but without the zoom flexibility. When the 300f4 will get an upgrade and how much it will cost is unknown, but it is the only long lenes...

Tungsten lights do not have a constant colour and send out pulses of different coloured light at slightly different times to get somewhere near sunlight constant light colour. The speed of the...

There can be a small number of situations where an AF upgrade is for worse rather than for better. I have not the slightest hesitation in saying overall the D800 AF is an improvemen, as was the D3s...

The background is a slightly better AF subject than the face, and we do not know if AF started behind the subject. If AF started behind the subject, with a 45 degree subject, AF can lock on the...

Tubes work quite well, though Nikon do not make any which support AF or work on G lenses. Probably the best Nikon option is the 300 f4 AF-s because it focuses close for a prime before adding tubes...

There are two single point AF differences to be aware of, neither of which seem specifically mentioned by Nikon. The first is the FX viewfinder points occupy a smaller percentage of the viewfinder...

Try reading page 47 of the instruction book for confirmation LiveVew is slower and also when AF may not focus accurate.

Apart from what has been said the G has better build quality and the price includes a good lens hood. It also costs more.

System resolution is as variable as the length of a piece of string depending on the sensor, the lens the aperture, the ISO, the subject, the lighting conditions and several other factors. The...

The meeting of the D800 is upgraded which takes a little getting used to. The autofocus is also upgraded to use shorter detection lines in single point autofocus. This can also take a little...

You have already started a new thread about your Sigma lens issue. It is well known older independent lenses sometimes do not work properly with the latest DSLR bodies without upgraded chips. You...

Do your Sigma lenses need upgraded chips to AF properly on a D800? Your results imply they do :(

It seems the claim of focus accuracy is consistent for any one lens (as it should be), but fairly variable between lenses of different focal lengths. Quote "I used a focus chart taped to a wall,...

Are you telling the truth? I use phase detect AF with great accuracy for around 90% of my photography. For the other 10%, including macro with a tripod, I prefer manual focus. I avoid using AF with...

You ignore Mr. Shepherds point ;0 My point is that 142 out of 142 seem to have ignored Nikon's guidance and expect AF to be good on 45 degree angle subjects, targets containing subjects at...

The centre AF point is most accurate. If you focus and recompose the distance to where you first focussed increases slightly Whether the change in distance is enough to spoil the photo depends in...