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Teleconverter Exposure Loss Calculator
Calculate light loss and effective focal length with a teleconverter.
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Loss
Compare Your Options And Get Clear Answers
Calculate light loss and effective focal length with a teleconverter.
Teleconverter Exposure Loss Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Stops lost = 2 log2(TC).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Teleconverter Quick Guide
Typical values for reference.
| Focal mm | f/ | TC | Stops lost |
|---|---|---|---|
| 200 | 2.8 | 1.4 | 1.0 stops |
| 300 | 4 | 1.4 | 1.0 stops |
| 400 | 2.8 | 2 | 2.0 stops |
| 600 | 4 | 2 | 2.0 stops |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Teleconverter Exposure Loss Calculator FAQ
Answers to common questions about this calculator.
Stops.
It gives a quick estimate of teleconverter exposure loss from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.