DX crop factor confusion with tele-converter

Using Nikon D7200.

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

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

Thank you !

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
   

Wilt wrote in post #18338033
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

lacogada wrote in post #18338213
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
   

Wilt wrote in post #18338327
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 ?

lacogada wrote in post #18338489
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!

Wilt wrote in post #18338523
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 ?

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).

lacogada wrote in post #18338569
...............

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.)
   

Thanks for the explanation guys.