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bluejay ...

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Thing to know about teleconverters (TC's) is that not all lenses can accept and work with them. It is strongly recommended that one use a TC which is made by the same manufacturer which has made the lens and the camera body. Usually it is just the longer lenses (70-200mm, 100-400mm, 300mm prime, 400mm prime, 500mm prime, 600mm prime, etc.) which successfully can handle a TC.

NOTE: Although some manufacturers refer to a TC as an "extender," this is NOT the same as an extension tube, which is used in quite a different way and on different lenses, the purpose being to reduce the minimum focusing distance of some lenses and enabling them to act as a closeup lens.
 
Just to throw a wrench into things, I've used the 2x on lenses that didn't have the glass clearance by using ... a short extension tube !! Just fiddling around.
 
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Yeah, from what I gather, you use the TC that matches the make of the lens, not the body. And yes, not all lenses officially support the TCs, but that doesn’t stop people from trying! I’ve heard of folks using a 1.4x with the PL100-400 after modifying the lens. It’s extra risky because you can’t collapse the zoom all the way down to 100 or you’ll break something.
 
With the Sony, the TC has a fairly deep reach into the back end of the lens, and so this means that only lenses which are able to handle that can be used. That includes the 100-400mm, 200-600mm, and the long primes. Third-party TCs are NOT recommended at all.

Aside from that, of course there is also the penalty in loss of light with TCs -- and in some situations that just isn't going to work out well for the photographer. I have used the Sony 1.4x TC on both the 100-400mm and the 200-600mm but would not even think of trying a 2x TC unless I were out in really, really good light. The primes, which are faster to begin with, fare better and they can handle the 2x more easily.l.
 
Yeah, from what I gather, you use the TC that matches the make of the lens, not the body. And yes, not all lenses officially support the TCs, but that doesn’t stop people from trying! I’ve heard of folks using a 1.4x with the PL100-400 after modifying the lens. It’s extra risky because you can’t collapse the zoom all the way down to 100 or you’ll break something.
Good points. The problem may not always be with the extender itself, but both the extender and lens, especially when zoom lenses are used. For example I can use RF extenders on my R6, but not the older EF extenders. The lens elements RF extender, when mounted on the R6 are very close to the sensor, while the lenses of the EF are positioned farther away from the sensor.

Example the RF 100-500mm Canon lens is fully retracted at 100mm, and fully extended at 500mm. When retracted to 100mm, the lower lens element gets close the sensor. If I decided to use the RF extender with this lens, I have to extend the lens to perhaps 300mm, first. Otherwise the lower lens element of the lens would stop right at extender's front lens element. In this case, the extender works from 300mm and higher, but not between 100 and 300mm.

Also, as some posters have mentioned extenders don't work with a few lenses. At least the loss of light is not a big of an issue with the new mirrorless cameras as it was with old cameras. Some of the new camera/lens combinations are designed to gain a few f-stops, too.
 
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katbel has made a new post about teleconverters. perhaps this off topic could be moved there?

(note: i don’t actually care, but you can’t complain about it and then take part. whatever……)
 
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Shot this last night just a couple miles from the Appalachian Trail. Set my iPhone up, used ProRAW, manually adjusted exposure to 30 seconds, then imported in to Snapseed and adjusted the exposure level down. That is it. No filters or any other post processing! Amazing what a smartphone camera setup can capture these days.

*Also, I used the Sky Guide app (highly recommended for any star gazers) and that is Andromeda towards the middle of the photo. Crazy because that was no visible with the naked eye.
47D9F7E2-E794-41F1-AC10-A65439B4FD41.jpeg
 
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