the difference in the mm of the lens


Status
Not open for further replies.

lsisaxon

Senior Member
Nov 29, 2004
11,941
0
0
#2
hi all, i am lookin at http://www.tamron.com/lenses/prod/18200_diII.asp web site claim 18-200mm lens, as i go thru the catalogue, i saw this statement of 28-300mm* 35mm eqn, what does this mean??? i am lookin at a D300 body so wat is the range? 18-200mm or 28-300mm?
Optically, physically and actually the lens is 18-200mm. The 27-300 comes about because many people who have come from the 135 format film ages are used to the angle of view given by these focal lengths, the angle of view given by the 18-200 using a DX sensor is like that of a 27-300 used on a full 135-format
 

compro_1975

Senior Member
Apr 24, 2005
1,983
0
0
#3
so on a camara on D300, what is the range i can use?
 

lsisaxon

Senior Member
Nov 29, 2004
11,941
0
0
#4
so on a camara on D300, what is the range i can use?
18-200, as what is stated. The angle of view of which would be like what a 27-300 would give on a full frame camera. It doesn't become a 27-300.
 

tunster

New Member
Oct 26, 2003
1,452
0
0
36
Hong Kong
antony.sofohk.com
#6
that's the "angle of view", but the shape of the photo will look different too.
meaning...even the angle of view is similar to 27-300, the shots will look much more "compressed" than the real 27- 300
 

lsisaxon

Senior Member
Nov 29, 2004
11,941
0
0
#7
that's the "angle of view", but the shape of the photo will look different too.
meaning...even the angle of view is similar to 27-300, the shots will look much more "compressed" than the real 27- 300
That's why I always emphasize the focal length is still 18-200, only the angle of view is similar to that of a 27-300mm on a full 135-format frame.

Similarly for those PnS, the actual focal length is around 4.7mm (depending on sensor size) which gives an angle of view similar to a 36mm on a full 135-format frame.
 

Status
Not open for further replies.
Top Bottom