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Thread started 25 Apr 2017 (Tuesday) 07:23
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DX crop factor confusion with tele-converter

 
lacogada
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Apr 25, 2017 07:23 |  #1

Using Nikon D7200.

Please tell me the field of view if using 300mm lens with 1.7 tele-converter.




  
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Overread
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Post edited over 1 year ago by Overread.
     
Apr 25, 2017 08:07 |  #2

Teleconverters work exactly the same way on crop sensor as they do on fullframe.

So for a 1.5 crop using a 1.7TC it would be


300mm X 1.5 X 1.7 = 765mm angle of view equivalent to 35mm camera (fullframe).


or

300mm X 1.7 = 510mm on any DX camera


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lacogada
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Apr 25, 2017 08:27 |  #3

Thank you !




  
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Wilt
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Apr 25, 2017 11:10 |  #4

Remember,


  1. the FL of a lens never changes because it is mounted on a different format body.
  2. Only the FOV of the lens alters when you move it to a different format body



Teleconvertors do CHANGE THE FL of the combination (primary lens+teleconvertor), (and max f/stopvalue shrinks in size because it).

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lacogada
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Apr 25, 2017 14:32 |  #5

Wilt wrote in post #18338033 (external link)
Remember,


  1. the FL of a lens never changes because it is mounted on a different format body.
  2. Only the FOV of the lens alters when you move it to a different format body



Teleconvertors do CHANGE THE FL of the combination (primary lens+teleconvertor), (and max f/stopvalue shrinks in size because it).

I believe the teleconverter changes my 2.8 to a 4.8.

Thanks




  
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Wilt
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Apr 25, 2017 16:23 |  #6

lacogada wrote in post #18338213 (external link)
I believe the teleconverter changes my 2.8 to a 4.8.

Thanks

Can calculate exactly the f/stop value...


  1. 300mm f/2.8 = aperture diameter of 107.14mm
  2. 300mm with 1.7 TC = 510mm
  3. 510mm / 107mm = f/4.77



Congratulations Mr. Lacogoda, you are correct. Now, for extra credit, 510mm lens on D7200 provides the FOV of what lens mounted on a D5?

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lacogada
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Apr 25, 2017 19:13 |  #7

Wilt wrote in post #18338327 (external link)
Can calculate exactly the f/stop value...


  1. 300mm f/2.8 = aperture diameter of 107.14mm
  2. 300mm with 1.7 TC = 510mm
  3. 510mm / 107mm = f/4.77


Congratulations Mr. Lacogoda, you are correct. Now, for extra credit, 510mm lens on D7200 provides the FOV of what lens mounted on a D5?


Oh no .... math !!!!

....uuuuuggggghhhhhh ... 200 ?




  
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Apr 25, 2017 19:38 |  #8

lacogada wrote in post #18338489 (external link)
Oh no .... math !!!!

....uuuuuggggghhhhhh ... 200 ?

Your 3rd grade teacher is smiling about your arithmetic skills, for your aperture calculation. But you did not get the extra credit point; you have scored poorly in Reading Comprehension and Retention, much to the disappointment of your 4th thru 6th grade reading teachers...
A: see Mr. Overread's post, and note line 3!


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lacogada
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Post edited over 1 year ago by lacogada.
     
Apr 25, 2017 20:57 |  #9

Wilt wrote in post #18338523 (external link)
Your 3rd grade teacher is smiling about your arithmetic skills, for your aperture calculation. But you did not get the extra credit point; you have scored poorly in Reading Comprehension and Retention, much to the disappointment of your 4th thru 6th grade reading teachers...
A: see Mr. Overread's post, and note line 3!

:-(:-(:-( ...............:-)


Why multiply by both 1.5 and 1.7 for the full frame calculation ?




  
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Apr 27, 2017 12:05 |  #10

You don't.

I only put that in because I don't know Nikon's line so put that in first as most people asking about things like this tend to have gotten confused about the difference in angles of view between fullframe (35mm) and crop sensor cameras.

Fullframe: focal length times power of the teleconverter

Crop sensor: focal length times power of the teleconverter

Crop sensor equivalent to fullframe angle of view: focal length times power of the teleconverter times the crop factor (which for nikon is 1.5).


Tools of the trade: Canon 400D, Canon 7D, Canon 70-200mm f2.8 IS L M2, Sigma 120-300mm f2.8 OS, Canon MPE 65mm f2.8 macro, Sigma 150mm f2.8 macro, Tamron 24-70mm f2.4, Sigma 70mm f2.8 macro, Sigma 8-16mm f4.5-5.6, Raynox DCR 250, loads of teleconverters and a flashy thingy too
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Wilt
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Post edited over 1 year ago by Wilt. (8 edits in all)
     
Apr 27, 2017 13:03 |  #11

lacogada wrote in post #18338569 (external link)
:-(:-(:-( ...............:-)

Why multiply by both 1.5 and 1.7 for the full frame calculation ?



  1. You multiply FL * teleconvertor factor because the TC is a set of supplement optics which changes the true FL of the combination (lens and TC) affecting ALL formats
  2. Any FL on APS-C sees a smaller window than the same FL on FF, and the FOV arithmetic is merely an EXERCISE so that someone (like a film shooter for 30 years) would know
    that the APS-C camera will have a FOV equal to using a longer FL on the FF. (If you never shot with a FF camera, this exercise is useless information, and the multiplication is a useless appication of 3rd grade skills that wastes your time.)



100mm FOV on DX = 1.5 * FL FOV on FX

24' x 36' FOV at 100' distance on DX using 100mm FL = 24' x 36' FOV at 100' distance on FX using 150mm FL

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lacogada
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Apr 27, 2017 13:58 |  #12

Thanks for the explanation guys.




  
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DX crop factor confusion with tele-converter
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