Teleconverters

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Drudkh

Senior Member
When using TC, lets say a 2.0X, the f-stop will increase right? But, by how much?

Example: 2.0X TC + lens with f5.6
What is the largest aperture I can get? I heard people saying increase 2 stops but what will it be?

I don't own a TC, so need you guys to contribute.

Thanks.

Del_CtrlnoAlt

Senior Member
f6.3? f8? depends on the TC i guess, i wonder if the Minolta TC, auto shows the widest aperture.

jonoq

New Member
Drudkh said:
When using TC, lets say a 2.0X, the f-stop will increase right? But, by how much?

Example: 2.0X TC + lens with f5.6
What is the largest aperture I can get? I heard people saying increase 2 stops but what will it be?

I don't own a TC, so need you guys to contribute.

Thanks.
Just brought 1..mine will cause my len to increase 2 stop.

user111

Senior Member
Drudkh said:
When using TC, lets say a 2.0X, the f-stop will increase right? But, by how much?
the maximum aperture will be decreased by effectively 2 stops
pls do not use the word "increase" because even though the marked value of the maximum aperture is numerically increased, the fact is that it is decreased

Drudkh said:
Example: 2.0X TC + lens with f5.6
What is the largest aperture I can get? I heard people saying increase 2 stops but what will it be?
if the lens starts off with maximum aperture of f5.6, then adding a 2x tc to it will decrease the maximum aperture to f11. however do note that from 5.6 to 11, it is a numerical increase

Drudkh

Senior Member
ok, lets not use increase or decrease,
lets say the lens is f6 and using 2.0X TC, the largest aperture will be f12?
so that means 1 f-stop is refered to the lens largest aperture, be it f5.6 or f8. but once used with a 2.0X TC, 2 f-stops, it becomes f11 and f16?

Am I right?

2100

Senior Member
Drudkh said:
so that means 1 f-stop is refered to the lens largest aperture, be it f5.6 or f8. but once used with a 2.0X TC, 2 f-stops, it becomes f11 and f16?

Am I right?
Yeah correct, sort of.

You are using Minolta system right?

Drudkh

Senior Member
2100 said:
Yeah correct, sort of.

You are using Minolta system right?
yup. thank you all for the input, finally i have confirmed the theory.
:thumbsup:

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