What is F-stop


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poh6702

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May 8, 2004
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#1
As I was reading the spec of x1.4 Teleconverter for DSLR camera, it mention that this unit will "Reduces lens aperture by one f-stop", would appreciate anyone can enlighten me what is it? what is the effect and what need to be done during photo shoot?

Example: Nikon D70 with AF50mm F1.8 lense and AF-S Teleconverter TC-14E II. Does it mean the F1.8 becomes F2.8? Will the camera able to auto adjust?

Thanks in advance.
 

LiOnElLiN

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#2
you may want to check if the teleconverter is compatible with your lens to begin with...
happy shopping!
 

EOS500N

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#3
poh6702 said:
As I was reading the spec of x1.4 Teleconverter for DSLR camera, it mention that this unit will "Reduces lens aperture by one f-stop", would appreciate anyone can enlighten me what is it? what is the effect and what need to be done during photo shoot?

Example: Nikon D70 with AF50mm F1.8 lense and AF-S Teleconverter TC-14E II. Does it mean the F1.8 becomes F2.8? Will the camera able to auto adjust?

Thanks in advance.
a 1.4x tc will reduce yr effective f-stop (aperture) by 1.4 times (1 stop). so eg. if u set the aperture to f2.8, times by 1.4 it becomes a f4. if u set at f4, it becomes a f5.6. in other words u'll b shooting at f5.6 instead of f4 when the tc is fitted.

similiarly for a 2x tc it doubles the f-stop. from f2.8 it becomes f5.6. however do ensure the tc is compatible for use with yr lens. otherwise it will not function properly. on some lens & tc combos u will lose yr AF ability as well.

hope this helps. ;)
 

poh6702

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May 8, 2004
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#4
Thanks, but what will happen to shooting, will the camera know that it is fitted with Teleconverter? For example if I am using F2.8 Lense, the camera will show max F4, right? The camera should know and I will not end up with wrong exposure?

Thanks
 

Witness

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#5
this is because the focal lenght has change....thus the difference in "effective f-stops"

camera auto adjust i take it to mean metering...if ya cam has TTL metering....no prob...the metering will still be correct if u follow the cam's build in system
 

Larry

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Apr 25, 2002
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#6
Witness said:
camera auto adjust i take it to mean metering...if ya cam has TTL metering....no prob...the metering will still be correct if u follow the cam's build in system
bearing in mind that the TC is compatible with the lens used of course. no guarantees for third-party brands, especially when used cross-brand (e.g. Nikon lens, sigma TC, and vice versa).
 

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