I have a crop lens. Can I fill a full-frame sensor adding an appropriate tele converter (focal length extender? Specifically, I have a 1/2" C-mount lens and terrible vignetting on a full frame camera. I assume, adding a 2X converter will double the actual image size thus filling the bigger sensor.
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\$\begingroup\$ "I assume, adding a 2X converter will double the actual image size thus filling the bigger sensor." Why do you assume that? \$\endgroup\$– Philip Kendall ♦Sep 16, 2015 at 8:36
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\$\begingroup\$ possible duplicate of What are the effects of using a crop lens with a full frame sensor? \$\endgroup\$– Romeo NinovSep 16, 2015 at 8:37
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3\$\begingroup\$ @RomeoNinov The crux of this question is about the effect of the teleconverter, which is distinctly different from that question. I'm sure we'll have one somewhere though :-) \$\endgroup\$– Philip Kendall ♦Sep 16, 2015 at 8:47
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\$\begingroup\$ Yeah, it really helps to put the actual question in the title rather than a general topic. The latter is what tags are for. \$\endgroup\$– mattdmSep 16, 2015 at 9:40
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\$\begingroup\$ possible duplicate of Is there a way to use Canon 18-200 EF-s lens on Canon 6D full frame body? \$\endgroup\$– Michael CSep 16, 2015 at 11:52
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Your basic assumption about teleconverters is right. But you haven't done the math:
1/2" is 6.4mm x 4.8mm—doubled is still only 12.8mm x 9.6mm.
OTOH it's not unheard-of for tiny format lenses to have image circles well larger than their specification.
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