when to not use course focus

When do you not use the coarse focus?

Use the coarse focus to raise the stage all the way up until it blocks. The objective at the highest position, the 4x objective should of course not touch the slide. Close the condenser and looking through the eyepiece lower the stage using the coarse focus until you see a clear image.

What is the difference between fine focus and course focus?

When the microscope is in low power, you are viewing objects that are about 40x larger than the object you are seeing. This means that the coarse focus can be used to get an approximate idea of where the object is located. However, when using higher magnifications such as 100x or 400x, this is not … Why Is It Important Not To Use The Coarse Focus While Using High Magnification …

When do you use fine focus and coarse focus knobs?

Mar 07, 2021 · Short introduction to focusing a compound microscope Using the coarse focus, lower the stage. Be careful that you turn it into the correct direction. Use the coarse focus to raise the stage all the way up until it blocks. The objective at the highest position, the 4x objective should of course not touch the slide.

What does the fine and coarse focus do on a microscope?

Oct 06, 2018 · Using the coarse focus with higher lenses may result in crashing the lens into the slide. If you try to move it again the chance is you ll run into the slide and either knock the specimen or even scratch the microscope's lens. Always use the fine adjustment and nothing else once you have set the coarse adjustment to the appropriate level.

At which magnification should you never use the coarse focus adjustment?

The coarse adjustment knob is used ONLY with the low power (4X, 10X) objectives. When focusing under the 40X or 100X objective, ONLY use the fine adjustment, never the coarse adjustment.

Why should you never use the coarse focus knob when performing an oil immersion?

Never use the coarse adjustment knob when focusing with the high-power or oil immersion objectives in place as this can damage the objective or the slide.Dec 14, 2021

On which objectives can you use the coarse focus?

the coarse focus knobs? A: Only use the fine focus with the 40X and 100X objectives; can use the coarse focus with the 4X and 10X objectives.

Why is it important to not use coarse knob on high magnification?

NEVER USE THE COARSE FOCUS KNOB ON HIGH POWER! The high power lens should be very close to your slide when in proper focus. If you turn the coarse adjustment knob while on high power, the objective could easily break your slide.

When should you use the fine focus knob?

Use the Fine Focus Knob to bring the image into focus. When using 10x and 40x objectives, use ONLY the fine focus knob so that you don't scratch a lens or break a slide. Always carry your microscope with one hand under the base and one hand on the arm.

When you need to focus the microscope which knobs should you use?

You should usually only need to use the coarse focus knob once for each new slide. Use it with the lowest power objective to get the specimen approximately in focus. After that, only use the fine focus knob, even after you change to a higher-power objective.

What's the difference between coarse focus and fine focus?

COARSE ADJUSTMENT KNOB — A rapid control which allows for quick focusing by moving the objective lens or stage up and down. It is used for initial focusing. 5. FINE ADJUSTMENT KNOB — A slow but precise control used to fine focus the image when viewing at the higher magnifications.

What could happen if the coarse focusing knob was turned when viewing with the 100x objective lens?

What happens if adjusting is done with the 100x lens? Focusing using the coarse adjustment knob can be adjusted with shorter lenses (4x or 10x). Adjusting on 100x, the lens could crash into the slide and damage the lens.