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<blockquote data-quote="hark" data-source="post: 741238" data-attributes="member: 13196">My intent was to put away the 300mm f/4 PF and use my 300mm f/4 non-VR lens. And while I did that for a couple of outings, the combo of the non-VR 300mm and 1.7x TC is just too heavy. So I put the 300mm f/4 PF back on my camera with the 1.7x TC.OMGosh. I was literally 15 feet to 25 feet away from ducks today - and that means a very shallow depth of field even at f/8 or f/9. Almost everything focused without any issues (except a damselfly which was very tiny and close). But even a black duck which can cause AF issues due to lack of contrast wasn't any problem. I used both Normal VR as well as Sport VR and could tell immediately the VR locked on with both settings. In the past, there were times that the Sport VR wasn't working making the image move inside the viewfinder from my not being able to hold the combo still.So now I will search for info on how to clean the contacts inside the front of the TC. Those contacts are recessed and are difficult to access. At least it's worth a try to get in there and clean them. I just don't know how to do that safely and carefully at this time.</blockquote>

[QUOTE="hark, post: 741238, member: 13196"] My intent was to put away the 300mm f/4 PF and use my 300mm f/4 non-VR lens. And while I did that for a couple of outings, the combo of the non-VR 300mm and 1.7x TC is just too heavy. So I put the 300mm f/4 PF back on my camera with the 1.7x TC. OMGosh. I was literally 15 feet to 25 feet away from ducks today - and that means a very shallow depth of field even at f/8 or f/9. Almost everything focused without any issues (except a damselfly which was very tiny and close). But even a black duck which can cause AF issues due to lack of contrast wasn't any problem. I used both Normal VR as well as Sport VR and could tell immediately the VR locked on with both settings. In the past, there were times that the Sport VR wasn't working making the image move inside the viewfinder from my not being able to hold the combo still. So now I will search for info on how to clean the contacts inside the [I][B]front[/B][/I] of the TC. Those contacts are recessed and are difficult to access. At least it's worth a try to get in there and clean them. I just don't know how to do that safely and carefully at this time. [/QUOTE]

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