Question about Canon Telephoto EF 300mm f/2.8L IS Image Stabilizer USM Autofocus Lens

1 Answer

Front focus problem

Could you please explain the operation of the 'focus preset switch'.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Legend:

    An expert who has written 200 answers of more than 400 characters.

  • Expert
  • 480 Answers

Hey hubro,
This switch is used to set a focus point to so you can quickly focus to the preset distance. What you have to do is set the switch to the on or on with sound setting then focus to the distance you want to preset and then press the set button. While this switch is set to the on or on with sound setting you just turn the focus preset ring which should be in front of the focusing ring and the camera should focus to the preset distance. I hope this helps!

Sincerely,
Allan
Go Ahead. Use Us.

Posted on Jul 23, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Front focus


He Pete, My Nikon, also has front focus. But most DSLRs have more or less front or back focus. Thats why you can correct this. The setup menu has an option called AF fine tune. (second last line)
If you are not familiar with this (I guess that is the reason you asked this question) you can look on lots of internet pages, where they explain how to check and how to correct this.
I'll add one link for you, but there are many more. Some sites also offer the possibility to print a correction card. Some magazines, sometimes add cards as a service. But that could be just luck when you get one. Focus Testing In the (English) manual of your camera you can find how to fine-tune your camera on page 327.
Success.

Jan 21, 2014 | Nikon D300 Body Only Digital Camera

2 Answers

How do you shut off auto focus on camera?


The focus mode selector switch is on the front of the camera, just below the lens release button. Switch it to the "M" position for manual focus, "AF" for autofocus.

Jun 02, 2012 | Nikon D80 Digital Camera with 18-135mm...

1 Answer

I need a manual for vivtiar 3188


Product MPN MPN: 80640 Key Features Features: Red-eye Correction Camera Type: Compact Resolution: 3.1 Megapixel LCD Screen Size: 1.5 in. Optical Zoom: Without Optical Zoom Digital Zoom: 4x Lens Interchangeable Lens: Not Interchangeable Lenses Optical Zoom: Without Optical Zoom Focus Type: Autofocus Macro Focus Range: 7.87 - 11.81 in. (w) Focal Length: 6.1 - 18.3 mm Image Quality Image Sensor Type: CMOS Camera Resolution: 3.1 Megapixel Image Resolutions: 2560 x 1920 · 2048 x 1536 · 1600 x 1200 Video Video Resolutions: 640 x 480 (VGA) Video Speed: 15 fps Video Format: AVI Exposure Control Aperture Range: f2.8/f4.8 (w/t) White Balance: Auto · Daylight / Sunny (Preset) · Cloudy (Preset) · Fluorescent (Preset) · Tungsten (Preset) Storage Memory Type: Built-in · SD Card Built-in Memory Size: 16 MB Compression Type: JPEG Flash Flash Type: Built-In Flash Functions: Flash Off · Auto Flash · Forced On Viewfinder / Display LCD Protected Position: Without LCD Protected Position Interfaces Interface Type: USB 1.1 Video Interface: Video Out Power Supply Battery Type: 2 x AAA Batteries Included Features Built-in Microphone: With Built-in Microphone System Requirements Operating System: Microsoft Windows 2000 · Microsoft Windows 98SE · Microsoft Windows ME · Microsoft Windows XP Dimensions Width: 3.5 in. Depth: 0.8 in. Height: 2.44 in. Miscellaneous Family Line: Vivitar ViviCam UPC: 19643806405 Product ID: 44609540 Return to top

Aug 30, 2011 | Cameras

1 Answer

It won't take pictures sometimes. push the shutter button and nothing happens.


The Nikon D40 in Auto Focus mode will only allow the shutter to operate when the image is in focus. When looking through the viewfinder, the bottom edge provides information relative to what you are looking at. See the image below:

steve_con_1.gif

Item 2 is the focus indicator. It must be illuminated to allow the shutter to release. If it is not illuminated, the lens has not been able to determine the correct focus. This can happen when attempting to take a picture in low light conditions. Make sure that the front facing "focus assist lamp" on the camera (between the shutter release and lens) has not been blocked or disabled (Settings Menu # 09) and try again. Many times, you will see and or hear the lens "hunt" for proper focus - the lens will travel from one end of its focus range to the other trying to find focus. When it can't, it stops and prevents the shutter from releasing. You can get around this "unable to focus" issue by changing the position of the switch on the lens to "Manual Focus" mode, detailed below:

If a lens has an "A - M" switch, move it to "M" to manually focus. If the switch says "M/A - M " then leave on M/A (unless you're going to be taking several or more in manual mode), as these lenses may be focused manually at any time in either position. As soon as you tap the shutter button in M/A you return to autofocus.



More advanced lenses, like the 18-200mm, 70-300mm VR and 18-135mm, and any lens with an M/A position, may be focused manually at any time without moving any switches. Leave them in their A or A/M positions.

I hope this helps and good luck!

Jun 13, 2011 | Nikon D40x Digital Camera

1 Answer

After taken photos the image out of focus


On the front of the camera body, below the lens release button you should find a two position switch labeled "AF" & "M" This is the "Auto Focus - Manual" selector switch. Make sure the selector is set to "AF" for auto focusing.

Your lens may have a similar focus selector switch on its barrel. There are two types of switches used - depending on the lens. The first is labeled "M/A" and "M" The "M/A" position indicates it is in "Auto Focus" mode with a "Manual" focus over ride capability. You can simply twist the focus ring to change the focus to a point other than that chosen by the camera's auto focus system. The "M" position is Manual Focus mode. No focusing operations will be performed by the D80 auto focus system - focusing must be done by the photographer.

The second type has "A" & "M" positions. These represent Auto and Manual focus. The difference between this type switch and the "A/M & "M" switch is that when in "A", the camera will no allow the focus to be changed manually. There will be opposition to twisting the focus ring in the position. Forcing it will likely result in damage. The selector switch must be changed to "M" to change the focus.

If either switch is set to manual, the auto focus system will be disabled, so it is very important to have them both set to "A" or "A/M".

I hope this helps. Please rate my reply - thanks!

Jan 04, 2011 | Nikon D80 Digital Camera with 18-135mm...

1 Answer

My Nikon p80 has difficulty focusing in low light. Also, the white balance is difficult to control and most low light photos are too yellow.


Seems to be interesting.
For low light focusing problem here is the solution which works with any digital camera.
I have observed that P80 has a slow focusing symptom. If you are in TELE range that is lens out. Then you will be hitting this issue very frequently.
Check if you are not restricting that red light bulb from throwing the light on your subject.This light is to assist the camera to focus.
Try doing this. Illuminate the object with a small/capable torch. Sometimes AF assist lamp is not doing the job.
another solution is focus in small steps. move lens out a little half press the focus/snap button. repeat this till you get the desired frame. This somehow helps camera to focus difficult objects.

White Balance:
Nikon P80 has good white balance functionality. But if you do not get what you want you need to set the WB manually. Here is the procedure to set white balance manually.
Procedure:
You need to select the preset manual for this procedure. Keep a white colored object with you always. This should be of size of a playing card at minimum.
when you will select the manual white balance preset. it will show you the measure option. Keep your white subject in front of the lens and press measure such that the camera view is filled with that white object's view.
Now you are ready to go. Your Camera will take the pictures just right.

Sep 22, 2010 | Nikon COOLPIX P80 Digital Camera

1 Answer

What are macro's what do they do...and what does


"Macro" can mean different things on different devices, but on cameras it's always short for "macroscopic".

Macro settings basically allow the camera to focus closely on a subject: to be truly macroscopic the size of the object in front of the lens should be reproduced at 1:1 scale or better on the film plane/digital imager. Most cameras cannot do this but many can achieve 1:4 scale; i.e. the image is one quarter the size of the object.

On your camera the icons next to the switch are showing you that there's a setting for close up images (the thistle) and one for distant objects (the mountain). All regular photographic lenses have a focussing range, usually from infinity (distant objects) to perhaps a few feet away. When in macro mode the switch moves the internal lens elements to shift the range closer: the camera can no longer focus to infinity but can focus to within maybe a few inches of the lens. The photographer just has to remember to cancel the setting afterwards and on most digital cameras there will be an icon in the LCD/viewfinder as a reminder.

I hope this has been of assistance, if so please return the favour by rating my answer. If not, then please add a comment to explain what you're still having a problem with along with the precise model of Vivitar camera and I'll be happy to offer further help.

Oct 31, 2009 | Vivitar ViviCam 8025 Digital Camera

2 Answers

Will not auto focus


There is a switch on the top of the camera that has your focus modes. switch to C-AF for Continuous auto focus. If you have it set to MF - Manual Focus that would explain this easily.

Mar 03, 2009 | Fuji FinePix S7000 Digital Camera

1 Answer

Focus problem


The factory presets would not have been affected by your grandson doing as you describe. Depending on what other lenses he might be trying to use, many have a separate switch located on the barrel of the lens to turn auto focus on or off.

Dec 25, 2007 | Nikon D40x Digital Camera

1 Answer

Help please


Is the lens moving/focusing?
If you switch to manual focus, can you make a shot?

Is it possible that "remote control" mode is selected (the button on top, right, in front of AF button) - in this mode the camera focuses but waits for the remote to shoot - just press the mode button until the LCD shows [S]

Dec 10, 2007 | Nikon D80 Digital Camera with 18-135mm...

Not finding what you are looking for?
Canon Telephoto EF 300mm f/2.8L IS Image Stabilizer USM Autofocus Lens Logo

Related Topics:

171 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Cameras Experts

kakima

Level 3 Expert

101516 Answers

TC CAMERA REPAIR.Com...

Level 2 Expert

165 Answers

old marine
old marine

Level 3 Expert

1703 Answers

Are you a Canon Camera Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...