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Tip On Using 2X Converter  
User currently offlineGranite From UK - Scotland, joined May 1999, 5615 posts, RR: 59
Posted (15 years 2 weeks 23 hours ago) and read 2439 times:
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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.

Gary Watt
Aberdeen, Scotland

5 replies: All unread, jump to last
User currently offlineCfalk From , joined Dec 1969, posts, RR:
Reply 1, posted (15 years 2 weeks 23 hours ago) and read 2404 times:

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


User currently offlineJasonm From Australia, joined May 2000, 238 posts, RR: 4
Reply 2, posted (15 years 2 weeks 23 hours ago) and read 2397 times:

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

Jason Milligan
Melbourne Australia

User currently offlineAndyEastMids From United Kingdom, joined Jan 2001, 1104 posts, RR: 2
Reply 3, posted (15 years 2 weeks 22 hours ago) and read 2395 times:


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.


User currently offlineGranite From UK - Scotland, joined May 1999, 5615 posts, RR: 59
Reply 4, posted (15 years 2 weeks 22 hours ago) and read 2390 times:
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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

Gary Watt
Aberdeen, Scotland

User currently offlineCkw From UK - England, joined Aug 2010, 813 posts, RR: 12
Reply 5, posted (15 years 2 weeks 20 hours ago) and read 2379 times:

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?



Colin K. Work, Pixstel
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