George II Loc: Fayetteville, Georgia

I have some canon FD lenses, I want to use them on my Canon D-550, I do not care about auto focus as I will be shooting landscapes and the moon. So auto focus is about as useless as a rocking chair in a outhouse. Now with a 200mm f/2.8 and a 2X tele-converter with the chipped adapter what will I have for a end result? 400mm with a f/5.6 ? Is there a simple formula that can be applied to any FD lens for my purposes? Thanks for any constructive advice.
Regards,
George II

imagemeister Loc: mid east Florida

Yes, that's what you should have - 400mm f5.6

George II Loc: Fayetteville, Georgia

Thank you very much for the reply, I find your advice and knowledge a valuable asset for me.
:thumbup:

SharpShooter Loc: NorCal

George, yes, no fancy formula. A 2x will drop any lens 2 stops from its native largest aperature. The inexpensive glassed converters are cheap enough to experiment with. The glassless, such as EdMika are almost $200 and don't work with all lenses(you need to check with Ed). If you are going full manual, you probably don't even need a chip, as long as the camera doesn't give you an error code and refuses to shoot.

PS, I don't know what a 550 is. It needs to be EOS for the adapters to go onto it. Good luck. SS

RicknJude Loc: Quebec, Canada

A 550 is a 550D or called a T2i.

SharpShooter Loc: NorCal

RnJ, Thanks for the info. SS

George II Loc: Fayetteville, Georgia

I'm sorry as well as dyslexic the camera is a Canon 550D or as it is known here as a T2i Thanks for the info, I already have the adapter with glass as well as the confirm chip, now to suss out the FD 2X tele-extender. thank you ever so much for the insight..

saichiez Loc: Beautiful Central Oregon

Actually more in 35mm equivalent I believe.

The T2i is not a full frame Canon, but rather has an APS crop sensor.

I believe the math factor applied to a 200 lens alone will be 1.6 times 200, or equivalent to a 320. Then if you have a 2X teleconverter, double that 320 to 640.

However, if the teleconverter is a 2x with glass in it, image quality may suffer.

If the mount adaptor FD to EOS has a glass element, another potential for IQ to degrade.

Also, when using 2X converters, you typically lose two exposure stops.

So, you should end up with 640, compromised image quality because of glass in the convertor, and less light gathering capability because of the two X converter.

I would suggest a 1.4X teleconvertor for 1.4X320 and a final equivalent of 450mm, and one stop light loss.

My understanding is that the Canon FD to EOS mount adaptor is quite expensive. Don't know what aftermarket adaptors there may be, but the adaptors will also potentially compromise image quality if there is glass there.

So, you may end up with two more pieces of glass in the system, and affect the IQ (image quality) substantially.

The CANON teleconvertors may not have glass in them... I don't recall from helping a friend buy and setup his Canon T4i, two L lenses and a 1.4 teleconvertor.

Good luck.

Canon used a very tricky register distance on the FD/FL lenses and they went more conventional on the EOS mount. It has been difficult to adapt FD lenses to many of the mirrorless mounts AND to the EOS mount.

Interestingly one of the best adaptor applications has been to the micro 4/3 Olympus and Panasonic because of the short register distance on the mount. There was no adaptor for Canon FD to Olympus standard 4/3 mount.

Harvey Loc: Pioneer, CA

A lot of knowledge posted here -some helpful and some just speculation. I have a 350d and 400d - a boat load of FD lens - 24,28,50,35-70, 75-150 w/matched 2X and 500 mm mirrored all work well with a $40 Zykkor glassed adapter.I also use the FD lens for reversed lens macro work as well as tubes.
Harvey

gessman Loc: Colorado

There is another factor I didn't see mentioned as I read rather hurriedly and that is that the adapters that allow the EOS to FD hookup have magnification in that glass in the adapters. I've heard that the glass adapters add about 1.4X so you might want to check that out and factor in for it. I'll let you do the math. I have tried three of the adapters with glass and haven't found one yet that do "L" equivalent FD lens justice. The quality of the glass in the adapters I've tried is not up to "L" lens quality in general and the results is that the images I've gotten are soft. I have a 135 f/2 which is nice and sharp on an FD camera but decidedly soft on my two digital bodies, one a 5D2.

On the bright side, as Sharpshooter said, Ed Mika makes a glassless adapter that will allow focus to infinity and it does work with your 200mm 2.8. Ed's adapers can be obtained at: http://www.ebay.com/itm/EdMika-Canon-FDn-EOS-adapter-kit-14mm-15mm-17mm-24mm-28mm-35mm-50mm-100mm-135mm-/170911278282 or you can get other useful information at http://edmika.com/ as Sharpshooter said.