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Teleconverters/extenders

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Luma
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adding 2 x convertor and micro lens to my kit

Unread post by Luma » Sat Dec 06, 2008 3:34 pm

Good day,
Could any one give me advise on adding a Sigma 2x convertor to a 50 x 500mm telephoto lens please.

I would also like to add a macro lens to take pictures of insects and flowers close up.

We have a Canon EOS 350D and EOS 1000D cameras. 50 x 500 Telephoto lens and 70 x 300mm lens.

We only got these recently, and would like the "experts" to let us know if getting the above, is a good idea. :?

Thank you
Luma

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oddesy
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Re: adding 2 x convertor and micro lens to my kit

Unread post by oddesy » Sat Dec 06, 2008 5:10 pm

Hi Luma and welcome :D :D

I would not add a teleconverter to either just because of the fact that the image quality and sharpness might decrease quite substantially and the autofocus will also be alot slower. But if you are fine with manual focus and dont worry too much over the IQ then you could always try it. maybe go to your local camera shop and test it out on your camera? :D
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richardharris
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Re: adding 2 x convertor and micro lens to my kit

Unread post by richardharris » Sat Dec 06, 2008 7:56 pm

With your camera you already have the equivalent of 750mm lens. If you really need more I would not go above a 1.4 convertor.

Unless you are into small bird photography using very powerful lenses in the Kruger (or similar) is usually pointless. Too much dust and heat haze ruin long distance photos!

There are three ways of getting good macro photos. Firstly buy a proper macro lens, and preferably 100mm or longer so that you can be a reasonable distance away from the insect. This is also the most expensive route! But is the best; optics specially designed for macro work.

Secondly, if you have a very good lens which does not focus close enough, buy some extension rings. I occasionally do this with my Canon 70 - 200 and it works really well. Cheap too.

Thirdly buy an add-on close up lens - fits like a filter. Again enables lenses to focus closer and can be very effective. But not so easy to come by. DQ swears by a Canon one but I have never been able to get hold of one. No longer made so e-bay and similar are your best bet. Sigma also used to make one. May also need adaptor rings to fit your lens.

Richard

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DuQues
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Re: adding 2 x convertor and micro lens to my kit

Unread post by DuQues » Sun Dec 07, 2008 8:49 pm

Hi Luma and welcome!

The Bigma is a lens that goes to f/5.6, so adding a 1.4 or 2.0 TC to it will mean that your camera will tell you to focus manually. Unless you have a really good camera, all will stop AF above f/5.6.
And image quality will degrade a lot on that lens...
So really forget about using one, for birds you're better off cropping when you get home, and other animals... Well, try to get closer! ;) Learn what they will do, where they will pass. 500 mm should always be enough...
Not posting much here anymore, but the photo's you can follow here There is plenty there.

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Stehan.f
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Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by Stehan.f » Sat Jul 11, 2009 6:27 pm

Hi Guys,

first of all thanks for the enthusiastic forum, I'm looking forward to visit KNP!!! :lol:

This is my first post in forum and I've already read lots of threads, but somehow none about using tele converters. Hope not to post this topic for second or even more time.

I'm not sure if there's an advantage to use an teleconverter for my EOS 400d. :cam:

I got following lenses:

Canon 75-300mm f4-5.6 - very old one, no IS, but still works fine
Sigma Macro 105mm f2.8
Canon 28-80mm f3.5-5.6

I intend to use all lenses with polarizing filters, beanbag as "tripod"

Who can recommend (and why?) using a teleconverter additional to above lenses?

Hope my English is sufficient to understand, didn't speak English for a long time...

Thanks for your answers in advance. 8)

Stehan.f

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DuQues
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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by DuQues » Sat Jul 11, 2009 7:04 pm

Hi Stehan, and welcome to the forums! :yaya:

In short, you can use teleconverters as much as you like, but... !
Teleconverters cost you a stop. And if you use a 2.0 teleconverter they cost you a stop more.
That's not really important, but what is important is that your camera will stop using Autofocus at f/5.6.....

So on your Canon 75-300mm f4-5.6 (f/5.6 + 1 stop is f/8, = No AF!) it wil revert to manual focus.
The Sigma Macro 105mm f2.8 however, plus 1 stop = f/4 will work perfectly, even with a 2x converter. (f/5.6)

The 300 mm will however be enough in Kruger, in most cases. Unless you start birding that is...
My longest lens is the 100-400, and except for birding I never had trouble with that lenght. Well, you always want more, but still...
Not posting much here anymore, but the photo's you can follow here There is plenty there.

Feel free to use any of these additional letters to correct the spelling of words found in the above post: a-e-t-n-d-i-o-s-m-l-u-y-h-c

Stehan.f
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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by Stehan.f » Sat Jul 11, 2009 7:42 pm

Hi DuQues,

thank you for your fast and helpful answer! :clap:

This makes my decision easy: No converter for my 75-300.

But I still consider thinking about the Macro+converter because the lens is of excellent quality compared to the others.

Do you think it should be worth trying although the focus is limited to 210 mm?
Would you recommend a original Canon converter or compatible e.g. Sigma?

Regards
Stehan.f

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DuQues
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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by DuQues » Sat Jul 11, 2009 7:58 pm

Macro is macro, and the macrolens is will serve you very well at landscape photography. I'm not sure what it'll do at longer distances though.

But I'm sure if that baboon or lion will let you near enough to make a photo of the cavities in their teeth... Would be nice photos, but I'm I'd not like taking them! ;)
Not posting much here anymore, but the photo's you can follow here There is plenty there.

Feel free to use any of these additional letters to correct the spelling of words found in the above post: a-e-t-n-d-i-o-s-m-l-u-y-h-c

Stehan.f
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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by Stehan.f » Sat Jul 11, 2009 8:27 pm

OK. I am convinced. No teleconverter. Thanks a lot!!

Using the macro regarding the lion's teeth... Uhh :shock: I guess he'd prefer me to being my object of (photographic) desire.

Maybe you could take the photo of me trying to be the lion's dentist... :cam: Should be worth an award of photographer of the year... :)

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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by wingman » Mon Jul 13, 2009 8:27 pm

My experience of a 1.4 converter on the 70-300 is usm was very not good at all and dont forget the canon teleconverters mainly only work with the L lenses (white lenses or lenses with the red ring on the front)
I now use a 100-400 and it is a very versatile lens I dont recommend the 1.4 even on this lens.

Stehan.f
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Re: Help with tele converter canon eos 400d sigma 100 2.8 macro

Unread post by Stehan.f » Tue Jul 14, 2009 9:19 pm

wingman wrote:My experience of a 1.4 converter on the 70-300 is usm was very not good at all and dont forget the canon teleconverters mainly only work with the L lenses (white lenses or lenses with the red ring on the front)
I now use a 100-400 and it is a very versatile lens I dont recommend the 1.4 even on this lens.


wingman: I didn't know that it works only with the L Lenses. Good luck I didn't order one, because my lenses are no L lenses.
Other forumites might be interested to know. Thank you!

Mavusana
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2x Converter or Telephoto Lens

Unread post by Mavusana » Mon Dec 28, 2009 10:12 am

I've been shopping around looking for "thee" lens that will capture what I see, the way I want it and impressive. But it seems that the more I shop the more I get really confused with the sales people, some suggest converters although I'll loose 2 f-stops, on the other hand some say buy the sigma 150-500mm or telephoto lens 600mm.

I know and trust you forumites will come with the better solution. Converter or Telephoto lens?? I've seen beautiful pics in this forum, of running/flying animals but clear as crystal and that's my kind of pics I like. some are as close as if the photographer was 1meter away from the animal.
A Dream becomes a goal when you attach a time frame to it.

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DuQues
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Re: 2x Converter or Telephoto Lens

Unread post by DuQues » Mon Dec 28, 2009 10:25 am

You should take the more expensive option....

And there are reasons of course:
A 2x converter does indeed take two stops of light. That in itself isn't too bad, but you run into a little problem then, no autofocus!
Almost all cameras will stop with AF above f/5.6, so unless you have a f/2.8 telelens yours will be manual focus only, at two stops slower shutterspeeds.

A second problem is image quality. It does degrade, unless you buy the top of the bill ones.
Personally I use a 1.4 extender only (and yes, on my camera it'll be manual focus only), and as it's a good brand (Canon) I can not see it in my photos.

There are converters that don't tell the camera it's there, like Kelko's, but the hit in image quality makes them less usable.
Not posting much here anymore, but the photo's you can follow here There is plenty there.

Feel free to use any of these additional letters to correct the spelling of words found in the above post: a-e-t-n-d-i-o-s-m-l-u-y-h-c

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Re: 2x Converter or Telephoto Lens

Unread post by Mavusana » Mon Dec 28, 2009 10:35 am

Thanks, DuQues!!
A Dream becomes a goal when you attach a time frame to it.

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gmlsmit
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Re: 2x Converter or Telephoto Lens

Unread post by gmlsmit » Mon Dec 28, 2009 10:52 am

Hi Mavusana.

I have been doing photography since about 1958.
I still have a Pentax Spotmatic and a Pentax K1000 with these I used a Bruno Werth lens with extension rings, unfortunately it was stolen, as well as a Polaris f4.5, 7 - 230 mm zoom lens with this I used a Pentax 2x converter and took wonderfull colour slides and photographs.

I now have a Nikon D1 and a Nikon D50 with Nikor lenses 18 - 55 mm and a 70 - 300 mm zoom lens. Together with this I have a Sigma 150 - 500 mm zoom lens and I also use a 2 x converter with these lenses. With digital photgraphy I have noticed a quality reduction when using the converter but not much, you will lose two f stops but that can be compensated for by increasing your ISO settings on your camera. By doing this you will increase the grain on your photograph but not as much as it was with film photography.

Please always remember that a telephoto lens enlarges the image before taking the shot but again this cannot be done infinitely. Most of the bird shots you see have not been taken with the object far away, they were still relatively nearby and then the shot was taken after much patience had been spent.

When doing wildlife photography our rule is set your camera at as low an fstop as possible and then on aperture priority, the camera will select the correct shutter speed for the shot.

Also another simple rule rather over expose a shot slightly as this can be corrected when editing the shot without risk of increasing noise, should you underexpose you will always increase noise white brightening up the shot. I always take at least two photographs of my object, one with the suggested shutter speed and one with the next slower shutter speed in other words I set my bracketting accordingly.

We have had great success with with what I have mentioned above.

Furthermore when purchasing a lens get a zoom lens, they are much more suited to wildlife photography, also save a bit longer and purchase one with "vibration reduction" and auto focus this helps a lot, most poor photos are due to camera shake, use a bean bag resing on a wall or a car window for thye stability of the camera and lens.

A bit of advice - do not buy something now what you really need, if you cannot afford it yet, rather save a little while longer and get the best for your requirement as buying now and improving later is not good economics.

Very often you can get a very good quality second hand lens at a reasonable price, check it yourself let it be checked by a reputable person, if necessary have it serviced by an institution that is qualified to do so and enjoy your photography. :) :) We will be looking forward to your shots in future. Also remember practise makes perfect and also that not every shot is the ultimate if you get more than 15% real good shots - you will be doing extremely well.
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