dullesguy
Posts: 243
Joined: Thu Jul 06, 2000 12:12 am

Converter Question For Canon

Sat Oct 18, 2003 3:23 am

Hey all,
Right now I'm using a Canon elan 7 and 75-300mm f.4-5.6 usm mostly for the pics. Hopefully soon to be a Canon Digital Rebel. But what my question is for the time being, do you think buying a 1.4 or 2x converter for more range would be worth it? Plus its a whole lot cheaper then getting a whole new lense for more range. Being that I can use it with the eventual new digi camera anyways to give me even more zoom then with the reg. Slr. Are converters harder to get quality shots with in general, or just on more marginal weather days? I do know a little bit about there being an automatic drop in the aperture? Is that correct. Any more info on what is needed to fully be known about the advantages and disadvantages of getting converters, rather then a whole new lense is appriciated!

Thanks for the help,
Stephen
"..the joy of the Lord is your strength" Nehemiah 8:10
 
Guest

RE: Converter Question For Canon

Sat Oct 18, 2003 3:31 am

I have a 10D with a Canon 28-135 IS lens and a 1.4x converter. It works well with one exception. On moving subjects such as airliners it tends to jump out of focus every once in a while. So I use it sometimes, but I use it on manual focus mode only.

Bill
 
ckw
Posts: 4586
Joined: Fri Aug 27, 2010 12:26 am

RE: Converter Question For Canon

Sat Oct 18, 2003 5:07 am

The Canon convertors are not really intended for use with this lens (or the 28-135) come to that. Optimum results will only be gained with the Canon L primes. However, it can be done. Whether the quality is acceptable or not, only you can decide. A convertor on any zoom lens will result in a noticeable loss of contrast and sharpness.

On the 75-300 you will lose 1 stop (with the 1.4) or 2 stops (with the 2x). You will also loose AF. You will also need to consider the need to use a higher shutter speed to counteract camera shake. So with an effective 600mm lens you need to think in terms of a handheld speed of around 1/500th - coupled to an effective minimum aperture of f8, this means you will be shooting pretty much with the lens wide open, which again adds to the quality problem.

Cheers,

Colin
Colin K. Work, Pixstel
 
cabbott
Posts: 496
Joined: Fri Mar 03, 2000 5:09 am

RE: Converter Question For Canon

Sat Oct 18, 2003 5:29 am

Hey CKW.

You could do something stupid like mount a Olympus B-300 Lens on the end of the 75-300mm.. I tried it the order day, perfect fit and it worked perfectly albiet a tad nose heavy!

Regards
Colin
 
TS
Posts: 717
Joined: Thu Sep 04, 2003 9:19 pm

RE: Converter Question For Canon

Sat Oct 18, 2003 5:36 am

You could do something stupid like mount a Olympus B-300 Lens on the end of the 75-300mm.. I tried it the order day, perfect fit and it worked perfectly albiet a tad nose heavy!

Did you use a step-up ring?

Thomas
Even a broken clock is right twice a day.
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Converter Question For Canon

Sat Oct 18, 2003 5:46 am

Be careful with using a Canon 2X with Canon 75-300 lens. I had a 75-300, one day I bought the 2X TC and to my surprise it didn't fit the lens, so I had to cut with a razor inside the lens around 1mm so that the fit could be possible.

Results are marginal, sometimes you get something interesting, many times you get poor quality images. Forget the auto focus.

Luis
 
ckw
Posts: 4586
Joined: Fri Aug 27, 2010 12:26 am

RE: Converter Question For Canon

Sat Oct 18, 2003 8:02 am

mount a Olympus B-300 Lens on the end of the 75-300mm

Love it! Great bit of lateral thinking

Cheers,

Colin
Colin K. Work, Pixstel

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