PixelRabbit
A naughty little bunny...
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Are you sure that a teleconverter will fit the 18-200mm? In my experience most zooms like that have a very flush rear element (or even one that protrudes out on its own). Teleconverters all have a protruding front element, even the pro series Kenko (which has the smallest one and is still very good quality) has a protrusion. This physically prevents them being attached to certain lenses. Sigma has the next biggest with Canon being the biggest of all (although there isn't a vast difference between the Canon and the Sigma - whilst the Kenko is quite noticeably smaller).
Check that it will fit and with the macro lens when checking make sure to read "how" people are attaching them; because most use a teleconverter on macro lenses for more magnification many use a teleconverter and an extension tube together with the tube on the teleconveter so that it allows the protruding front element to slip into the extension tube and then onto the lens itself.
I don't know how the 90mm macro is setup - all I can say is that the Sigma 70mm will accept a Sigma brand 1.4TC without problems (I also assume it will fit a Kenko pro series teleconverter as well).
Note - the Kenko series teleconverters come in two kinds - you want the more expensive pro series as the cheaper series option is a lower grade.
After a lot of googling I have determined that the Kenko Pro 1.4 will work on this lens and is in the budget It looks like there is a possibility that I would have to use an extension tube to attach it to the 18-200 I can't really find a straight answer on that but if that is the case I'm sure I can shop around and find something later if need be.
This guy uses a reverse mounted 28mm lens on a cheap 2x converter: Thomas Shahan!
You might also check out his video:
Wow, his work is amazing!! Very inspirational for sure. I am going with the 90mm because I like the versatility of it on top of it's macro capabilities
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