85mm f/1.8D - A good choice?

[Carl Stone]

"Especially fun when it gets mounted on a D70 and becomes a 120mm (effective f/

length) f1.8 AF-D!"

 

Sorry Trevor, no it doesn't become an effective 127.5mm f/length. What it does do is

keep it's 85m focal length, but you get a 127.5mm crop of the image. In other words

there is no magnification increase simply by moving ther lens from a 35mm film

camera to 1.5 crop factor DSLR. The DSLR, with it's smaller sensor, is only using the

center of the image from that lens, so is actually cropping the image compared to

what a 35m film camera would show. It's still going to be an 85mm lens.

[david_h._hartman]

"What is happening to � signs on PN nowadays? This

never used to happen." --Trevor Hare<br>

<br>

This is being discussed on the <u>PHOTO.NET Site Feedback</u>

forum. Hopefully it will be corrected soon.

[fourfa]

jeez, can we drop the arguing about field of view vs effective focal length, I think we all get it. personally I'm happy with saying effective 127mm focal length.

[Carl Stone]

There is no argument, some people mistakenly believe that there is an increase in

focal length. If you want to endorse that error, be my guest, but please allow that the

correct info be posted, as some do want the right information.

[Carl Stone]

Just so a more informed decision can be made about which lens does what, here's a

link to a shot by the 1.4.

 

http://www.photo.net/photo/611293

 

Now THAT is smooooooooth bokeh!

[raywei]

I have to say Carl Stone IS RIGHT on digicam cropping v.s. magnification -- it's cropping, not magnification. This is the reason that some lenses that don't perform well on the edge will do a better job on a digicam. That's why the super-wide zoom lens that come with D70 could be made cheap. You want to use it on a film camera? Nope. Nikon makes sure that it won't happen -- bad edge effect is cropped off on on a CCD, not on a film.