Just for kicks while trying to get a close up of the goalie's helmet I threw a TC1.7 on a rented 400 AFS-II f/2.8. The metadata says it is 950mm while it should only be 710mm. Is the metadata wrong or is the 1.7 for some reason extra powerful at magnification when combined with the 400mm AFS-II f/2.8. I'm not sure if it was actually at 950 or 710 as both are soo zoomed in that I wouldn't be able to tell the difference, whatever it was it was incredibly difficult to get a sharp shot with.

No epert on this myself....
But if I had to guess... this was on your D90 and Not your D700 right?

400 x 1.5 (crop factor) x 1.7 =952

For NX 2, at least, the metadata reads it with the TC factored in. So, you can get a focal length for a lens that technically does not reach a certain length on its own.

That is perfectly normal. Wrong, but normal.

EBH

EB-1 wrote:
That is perfectly normal. Wrong, but normal.

EBH
+1

Okay, just wanted to make sure it wasnt something broken with my gear. Sucks that it reports incorrect metadata And for the other person's question, no it was with my d700, I keep the 70-200 on the d90 at all times and use the 24-70 or whatever I'm renting on my d700

DX crop mode?

That would read 1000mm. 400 X 1.6667(actual 1.7#) X 1.5 = 1000mm

The exact same thing happens on my D700 with my 1.7 & 300mm 2.8. It shows 700mm as the focal length. I am not shooting in crop mode. If there is a reason for this I would be interested in hearing it.

No thoughts from anyone?

EB-1 wrote:
That is perfectly normal. Wrong, but normal.

EBH


Right

Ah, I was getting that it was perfectly normal for a DX camera not FX... Sorry my misunderstanding.

I have posted something similar to this problem. I have not been able to find a logical explanation either.

http://www.fredmiranda.com/forum/topic/850155/0#lastmessage


And I would love to find a good explanation too.