07-02-2017 03:17 PM
I have a Canon 60D and an 80D, using a couple of my lenses or a Tamron 2x TC on the 80D (I know you guys are not a fan of converters) but I wanted to see if I could reproduce the same problem. That shooting in sunlight the camera is three f-stops too bright. If I manually correct it the exposure is just right. I noticed too even thou I set the ISO at an upper limit of 400 it is shooting at 6400 in green mode or program mode. I’ve cleaned the contacts with a contact cleaning kit. I don’t know if the camera has a metering problem or if I’ve changed one of the settings. BTW I'm not shooting into the sun or have the sun at my back, it's overhead. thanks, Blair
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07-02-2017 06:08 PM
That is a fully manual lens with a preset aperture. Any shooting mode that tries to adjust the aperture will give unexpected results.
You should only set the camera to either M or Av modes when using it. Turn off exposure compensation until you can get your exposures properly set without it. I would also set the ISO to a fixed value until you get Shutter Speed figured out.
07-02-2017 04:13 PM
Setting a limit on ISO has no effect on Green [A] Mode. Ditto for Program Mode.
If you want to test the camera body, eliminate the number of possibilities. Stop using the extender, or tell what lens you are using.
If the camera is not exposing properly without the extender, check your exposure compensation settings. Also, make sure the camera is not in a multiple exposure mode. Your 80D has features not found in a 60D.
07-02-2017 05:25 PM
07-02-2017 06:08 PM
That is a fully manual lens with a preset aperture. Any shooting mode that tries to adjust the aperture will give unexpected results.
You should only set the camera to either M or Av modes when using it. Turn off exposure compensation until you can get your exposures properly set without it. I would also set the ISO to a fixed value until you get Shutter Speed figured out.
07-02-2017 08:30 PM
thank you very much for the information and replies...I'll try as you have suggested
07-02-2017 11:08 PM
That mirror lens is an f/8 lens and your teleconverter robs a stop, so it is a max aperture of f/11. I'm kind of surprised it can even autofocus with the TC on it.
07-03-2017 08:27 AM
@ScottyP wrote:That mirror lens is an f/8 lens and your teleconverter robs a stop, so it is a max aperture of f/11. I'm kind of surprised it can even autofocus with the TC on it.
That's just it, it doesn't autofocus at all. It's fully manual. It's likely that the extender could be confused when used with a lens that cannot communicate with it. It could be reporting erroneous aperture info to the camera body.
07-03-2017 09:45 AM
07-03-2017 10:55 AM - edited 07-03-2017 11:47 AM
Many cameras cannot AF with apertures smaller than f/5.6. Your 80D has several AF points that can focus out to f/8. The AF point to use is always the center AF point.
When you add the extender to your. 150-600, the minimum aperture easily exceeds f/5.6. In fact, with an aperture range of f/5-6.3, the lenses are already exceeding the f/5.6 limit. These limits are impose in firmware because the designers feel the camera may not focus consistently and accurately with narrower apertures.
So, why does the lens seem to AF properly, despite exceeding f/5.6? It works because the lenses reportedly do not report accurate aperture data during focusing. In other words, the lenses fool the camera into thinking that it is focusing a lens with a wider aperture.
Using an extender only makes the problem worse. Your AF system will not work properly with the 2x extender, and the 2x extender will not work with [just] any lens in your bag. Personally, I wouldn't worry about my camera failing because a third party extender does not work meter well when used with the camera, especially 2x extender. It is to be expected.
[EDIT]
The extender is designed to work with specific Tamron lenses.
07-03-2017 12:56 PM
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