Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Nikon Lenses

Reply
 
Thread Tools Search this Thread
Old Jan 19, 2010, 12:07 AM   #1
Member
 
Join Date: Dec 2009
Location: Los Angeles, California, USA
Posts: 87
Default Is this a teleconverter?

Someone gave me this 50mm f/1.4 prime, with a teleconverter stuck on the back. How to I take it off?

Edit: Got it off.

Can anybody identify it? It's from around 1982.
Will it work on modern AF lenses?



On the side it says NA AUTO TELEPLUS 2X LENS MADE IN JAPAN

Also, how much light do I loose with it?

Last edited by NothingRare; Jan 19, 2010 at 12:28 AM.
NothingRare is offline   Reply With Quote
Sponsored Links
Old Jan 19, 2010, 5:28 AM   #2
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

With a 2X teleconverter, you lose 2 stops. That 50mm f/1.4 becomes a 100/2.8.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Jan 19, 2010, 8:34 PM   #3
Member
 
Join Date: Dec 2009
Location: Los Angeles, California, USA
Posts: 87
Default

is dof increased as well? doesn't look like it is....
NothingRare is offline   Reply With Quote
Old Jan 19, 2010, 9:08 PM   #4
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

Quote:
Originally Posted by NothingRare View Post
is dof increased as well? doesn't look like it is....
DoF depends on focal length and aperture, however you get there. A 50/1.4 on a 2X TC has the same DoF as a 100/2.8.

A TC does not affect the minimum focusing distance. If you have a 50mm f/2.8 1:1 macro lens, putting it on a 2X TC will give you a 100mm f/5.6 2:1 macro lens. (round numbers.)
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Jan 25, 2010, 5:41 PM   #5
Senior Member
 
kazuya's Avatar
 
Join Date: Sep 2008
Posts: 1,007
Default

TC's are a quick cheap way of getting more length out of a lens but they do tend to give poorer results, the TC in the pic does'nt have any electrical contacts (as you would expect for its age) so if you put it on your camera the lens would be completly manual, no functions on the lense would work.
kazuya is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 6:23 PM.