Granite
Topic Author
Posts: 5026
Joined: Tue May 18, 1999 5:55 pm

Tip On Using 2X Converter

Mon Apr 23, 2001 6:16 pm

Hi all

Just got my first 2X converter on Friday. I had one before but not for my Canon.

Anyone willing to give me tips on using it?

It will be used with a Sigma 70-210mm zoom.

I am not planning to use it much for aircraft on the move but for stationary aircraft.

Regards
Gary Watt
Aberdeen, Scotland
 
cfalk
Posts: 10221
Joined: Mon Dec 04, 2000 6:38 pm

RE: Tip On Using 2X Converter

Mon Apr 23, 2001 6:46 pm

Stationary pics are probably your best bet. Remember to stop down your lens significantly. From what I have seen, vignetting will show up much easier with a teleconverter than a normal lens. I'd say any f-stop larger than 9.5 or even 11 should be avoided to prevent vignetting.

For those who don't know, vignetting is when the corners go dark, and is pretty typical of long lenses at wide-open aperture. Here's a sample of mine.

Click for large version
Click here for full size photo!

Photo © Charles Falk



Charles
The only thing you should feel when shooting a terrorist: Recoil.
 
jasonm
Posts: 234
Joined: Tue May 02, 2000 3:46 pm

RE: Tip On Using 2X Converter

Mon Apr 23, 2001 7:06 pm

Hi Gary,

I don't own a converter but I'd like to know how you go with yours and the roll of Fuji Reala  Smile

Regards,
Jason Milligan
Melbourne Australia
 
AndyEastMids
Posts: 1051
Joined: Wed Jan 24, 2001 10:24 pm

RE: Tip On Using 2X Converter

Mon Apr 23, 2001 7:41 pm

Gary,

Like Charles says, stop down a fair bit.

The only other tip I could give you is this: because the converter adds very little size and weight to your camera and lens combination, you will be tempted (at least in the early days) to use it in the same way as your 70-210 lens on its own. No matter what you do, a 420mm lens needs much more careful handling than a 210mm lens if the results are not to be blurred / shaken. Be cautious in using the lens + converter and you should be OK, and do not use the converter for the sake of it.

Andy
 
Granite
Topic Author
Posts: 5026
Joined: Tue May 18, 1999 5:55 pm

RE: Tip On Using 2X Converter

Mon Apr 23, 2001 8:09 pm

Hi all

Thanks for the tips so far.

I will only really be using it for stationary at ABZ. Some aircraft that park under the control tower are just slightly too far away for my 210mm.

This converter will bring them in a little closer. So hopefully it will work out well.

Andy.......Dean and I will be picking your brain for Miami tips sometime in the future Big grin

Regards
Gary Watt
Aberdeen, Scotland
 
ckw
Posts: 4586
Joined: Fri Aug 27, 2010 12:26 am

RE: Tip On Using 2X Converter

Mon Apr 23, 2001 9:17 pm

A lot depends on the quality of the convertor - I bought the best I could afford (2nd hand!) and have been very pleased with the results. I found stopping down 1 stop was sufficient to avoid vignetting - your milage may vary. I've just uploaded some pics taken on the Heathrow 27L approach using a Canon 1.4x or a Canon 2x convertor with a 300mm lens - have a look if they get accepted.

One bonus you get with a convertor is that your close-focus distance remains the same, so in effect you increase the macro capability of your lens, which has some creative possibilities. One downside is that your depth of field is significantly reduced.

In practice, the fact that you're losing 2 stops to the convertor, plus at least one more to avoid vignetting and provide a little depth of field means that you will need to shot at an effective f11 (assuming your prime lens is f4) ... do you have a good tripod?

Cheers,

Colin
Colin K. Work, Pixstel

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