Computer · Surveying - Optical Instruments
Which of the following is considered a distinct disadvantage when using an internal focusing telescope over an external focusing design?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Wear on the rack and pinion is less due to minor adjustments
- 2The internal lens layout reduces the total brilliancy of the image✓
- 3The overall length of the tube remains fixed during focusing
- 4The line of collimation is less likely to deviate during adjustment
Correct answer
The internal lens layout reduces the total brilliancy of the image
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