tele converter

mcritch · 03-23-2011, 02:35 PM

hi their people in pentax land i got a question i got a (soligor auto tele converter 3x for nikon lens) my question is. is there a converter or an adapter out there to buy that wood attach to a (pentax kx camera screw to a nikon screw) because i got a 300mm rmc tokina i want to use on my pentax kx thanks.

RioRico · 03-23-2011, 04:41 PM

You can buy a Nikon-to-Pentax adapter for maybe US$35 (I haven't checked prices lately). These are widely available on eBay. The adapter has its own teleconverter elements inside, maybe ~1.2x, so your total tele-extension would be ~3.6x and your effective focal length would be ~1080mm. The problems are that all the tele-extension will degrade image quality to some extent, and will greatly reduce the amount of light reaching the camera's sensor. If image content is more important than quality, that doesn't really matter. Just boost the ISO and go for it!

If the Tokina lens is Nikon-mount and you don't want the IQ loss or extra extension of the adapter, it is possible to modify the base of your 3x TC so that it fits on Pentax mounts. The easy way, to slightly alter the TC base to allow a force-fit, I do NOT recommend in your case. Such a long and heavy lens+TC combination would be too insecure on a PK mount. Otherwise, you (or someone handy with tools) could remove the TC's base and replace it with a Pentax base, such as a cheap flanged M42-PK adapter. This takes a bit of work but is more secure.

03-23-2011, 02:35 PM	#1
mcritch New Member Join Date: Mar 2011 Posts: 1	tele converter hi their people in pentax land i got a question i got a (soligor auto tele converter 3x for nikon lens) my question is. is there a converter or an adapter out there to buy that wood attach to a (pentax kx camera screw to a nikon screw) because i got a 300mm rmc tokina i want to use on my pentax kx thanks.

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03-23-2011, 04:41 PM	#2
RioRico Veteran Member Join Date: Jun 2008 Location: Limbo, California Posts: 11,263	You can buy a Nikon-to-Pentax adapter for maybe US$35 (I haven't checked prices lately). These are widely available on eBay. The adapter has its own teleconverter elements inside, maybe ~1.2x, so your total tele-extension would be ~3.6x and your effective focal length would be ~1080mm. The problems are that all the tele-extension will degrade image quality to some extent, and will greatly reduce the amount of light reaching the camera's sensor. If image content is more important than quality, that doesn't really matter. Just boost the ISO and go for it! If the Tokina lens is Nikon-mount and you don't want the IQ loss or extra extension of the adapter, it is possible to modify the base of your 3x TC so that it fits on Pentax mounts. The easy way, to slightly alter the TC base to allow a force-fit, I do NOT recommend in your case. Such a long and heavy lens+TC combination would be too insecure on a PK mount. Otherwise, you (or someone handy with tools) could remove the TC's base and replace it with a Pentax base, such as a cheap flanged M42-PK adapter. This takes a bit of work but is more secure.