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Teleconverters/extenders

Discuss and share your wildlife photography, filming and equipment
Mavusana
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Re: 2x Converter or Telephoto Lens

Unread post by Mavusana » Mon Dec 28, 2009 11:05 am

Thank you GMLSMITH, you sound like a very experienced person. thanks once again for your sound advice, I'll post some of the pics I've taken few weeks ago at KNP. And your sincere comment on them would be highly appreciated.

We need people like you, who don't mind to share their knowledge with others.
A Dream becomes a goal when you attach a time frame to it.

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bert
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Re: 2x Converter or Telephoto Lens

Unread post by bert » Mon Dec 28, 2009 11:54 am

Nicely put gmlsmit
I used a 1.4 converter on a Canon 300 mm 4.0 L lens
Made a few tests at Lake Panic some years back
And the same bird without the converter
The image is still great but misses the sharpness and crispness
So i believe in not using the converters, unless you have a prime lens of top quality.
Read through many tests this weekend for the Sigma 150-500. Friend of mine thinks of buying one. And with all Sigma zoom lenses the conclusion is that at the biggest reach (500 or with the 120-400 at 400mm) the sharpness is the worst.
Not bad but will show if you decide to make a poster.
So if you use a converter it will show at the biggest reach.

And i use Adobe Lightroom and it has a great tool. Adjusting noise in the color and luminous (white) sections of the image. Works great. Tested it on snow images.

With photo editing in Lightroom for eg you can adjust the sharpness, so some corrections are possible :thumbs_up:

btw, the Sigma scored great, but always with the remark price versus quality.
The Canon 100-400 did better, but then that one is much more expensive, so should be better

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DuQues
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Re: 2x Converter or Telephoto Lens

Unread post by DuQues » Mon Dec 28, 2009 12:42 pm

Going offtopic a bit here, but this I don't agree to:
gmlsmit wrote: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.

Instead of overexposing you are better off underexposing. White = white, and all the other colour information is gone. The underexposed bits can be (at the cost of grain) revealed as the information is still there.

Just to show you, I put up an example to play with on one of my sites. Grab this (7MB!) original photo and play with it. Up the exposure by 1.5 or more stops, and look at the colours. The ellies become brown, and you can see what happens to the background and such.
(It's not the best of photos, but keep it on your own pc only for playing please...)
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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Tony T
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Re: 2x Converter or Telephoto Lens

Unread post by Tony T » Tue Dec 29, 2009 1:19 pm

I am weary of overexposing (but then I own an inexpensive lens -Canon 55-250). I set Exposure Comp. 1 to 2 notches darker in sunlight.
I find that in most compositions there is always a bit that is very light and if you overexpose you run the risk of getting blown highlights on that spot. It may be an important area like an eagles beek, like has happened to me. As far as I know blown highlights are irretrievable.
I'm going to upgrade my lens in the new year and I've set my mind on a Prime 400 for wildlife and birds in flight. I feel it gives you more quality than a zoom which will allow 1 or 2 notches of cropping in post processing, if required.
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Josh of the Bushveld
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Re: 2x Converter or Telephoto Lens

Unread post by Josh of the Bushveld » Mon Jan 04, 2010 4:00 pm

I use a 2x Kenko t/c on my 80-200mm F2.8 I don't have autofocus issues. I think I get better quality than using a Sigma 150-500mm (not had a good chance to compare shots yet).

Duques, bert, should we start a new thread in the Camera Club forum to discuss under and over exposing?
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wingman
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Re: 2x Converter or Telephoto Lens

Unread post by wingman » Wed Feb 17, 2010 7:32 pm

to see the effect of the converters take a look at the 400mm shootout listed on www.ejphoto.com it is interesting to see the result of this dollar test.

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big5spotter
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Re: 2x Converter or Telephoto Lens

Unread post by big5spotter » Wed Feb 17, 2010 7:52 pm

I have had long hard thoughts about this and spoke to allot of people.The canon 100-400 is a better lens than the Sigma 150-500 but the canon costs allot more so for the price of the sigma its more worth it how can I say its more value for money.Think the Canon almost R10 000 more expensive than the sigma and the sigma doesn't produce bad shots.
If I were you get the Sigma or if financially possible the Canon and if you not happy then get a converter.
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bert
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Re: 2x Converter or Telephoto Lens

Unread post by bert » Wed Feb 17, 2010 8:24 pm

joshilewis , i am slowly moving discussion threads to the camera club thread
Will make one with all the under-and over exposing topic i can find
Will move all technical discussion to the Camera Club
More suited :thumbs_up:

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Massimo
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Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by Massimo » Mon May 17, 2010 7:52 pm

Hi guys!

Im going to Kruger in June and i really would like to buy a lens but i really have no money to do so! I have the standard lens for my Canon. i got the Canon EOS 450D + EF-S 18-55mm IS + EF-S 55-250mm IS lens!

Now i see that there is a second hand teleconverter for sale! It says this

"Kenko AF 2x Teleplus MC7 DG for Canon is a nice and cheap way to double your zoom power and it won’t cost you thousands. Turns your 200mm into a 400mm lens… Used 5 times max!"

can any1 help me please what must i look out for is this any good etc etc.. your help will be greatly appreciated!!

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Massimo
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michel367
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by michel367 » Mon May 17, 2010 7:54 pm

What F- factors does your lenses have Massimo?

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Massimo
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by Massimo » Mon May 17, 2010 8:00 pm

Canon EF-S 55-250mm f/4-5.6 IS
Canon 5D MK III :) :), Canon 7D , Canon 450D | Canon 400 F5.6 L | Canon 70-200 F2.8 L IS|Sigma 10-200 EX DG OS F4-5.6 & goodies :)
Runner up wildlife photographer of the year 2012-sunday times & winner-Canon S.A. reflection category

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michel367
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by michel367 » Mon May 17, 2010 8:01 pm

Then you will have a problem with your Auto Focus not working correctly.

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Massimo
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by Massimo » Mon May 17, 2010 8:04 pm

can you please give me the reason as to why? I have just started with photography and im trying to learn as much as possible about it!!

Thanks for your help bud!! can you also tell me this should i get a lens hood for the lens? what is the benefit of the hood and what hood do i get for that lens?

Thanks yet again
Canon 5D MK III :) :), Canon 7D , Canon 450D | Canon 400 F5.6 L | Canon 70-200 F2.8 L IS|Sigma 10-200 EX DG OS F4-5.6 & goodies :)
Runner up wildlife photographer of the year 2012-sunday times & winner-Canon S.A. reflection category

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michel367
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by michel367 » Mon May 17, 2010 8:15 pm

I found this in another thread and might explain it a bit for you:

DuQues wrote:A 2x converter costs you two stops.

So from f/4.5 you end up with f/8, and a 450D will loose AF. The 1.4 converter is just 1 stop, so f/5.6 which will please the camera enough for AF.
Tripod or other support make no difference to that, but will of course make a difference to the sharpness to your photo.

There are two real options in the Parks:

AV (Aperture value.)
You decide how much DOF there will be in the photo. Great option, but with small apertures you'll need to watch your shuttertime like a hawk, or you may get blurred photos.

TV (Shutter priority).
You decide the shuttertime, and the appropriate DOF is selected by the camera.
Set to 1/250 or 1/500 you'll get crisp photos of the animals, but in situations with a lot of light may get distracting backgrounds. Big problem can occur, the camera hasn't got a fast enough lens on it, so isn't able to get the proper exposure and won't shoot.

So in Kruger, with clouds racing past, or branches overhead, choosing the TV setting may be the safer setting, but you also may need to change your shuttertime in a hurry.

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RUMURUTI
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Re: Kenko Teleplus MC-7 "DG" 2x AF Teleconverter HELP

Unread post by RUMURUTI » Mon May 17, 2010 8:46 pm

Hi Massimo,
I use Nikon and have a Kenko Mc7 2X. Used it in KNP last year and worked wonders with my 80-400 mm zoom lens.
Here's an example of a very long shot with it mounted.
Image
Image
Had no particular problem except that it felt a little loose and not firmly blocked between lens and camera. Another small detail, it does not show on your meta data so if you use it on a 400 mm it shows as 400 and not 800 mm.

This one was miles away, Mike you remember the spot??
Image
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