Tele-extenders, Anyone? Since the subject of tele-extenders is a frequent subject matter here, I thought I would mention an article in April's Outdoor Photographer by George Lepp...

Billbobboy42 Loc: Center of Delmarva

Since the subject of tele-extenders is a frequent subject matter here, I thought I would mention an article in April's Outdoor Photographer by George Lepp, "Eagle Eyes". In an inset he demonstrated the use of multiple tele-extenders. He used a Canon 5D Mark III with an 800mm/5.6L lens. Photos were of an eagle at some distance away (don't remember how far).
1st photo - with only the 800mm
2nd " - with 1.4tc added = 1120mm
3rd " - with 2x " = 1600mm
4th " - with 2x + 1.4 = 2240mm
5th " - with 2 2x added = 3200mm
6th " - with 2 2x + 1.4 = 4800mm

So, with all three tele-extenders piggy-backed, the 4800mm image is 6 times larger than the original 800, right?

My single question is: which image would be sharper - the 800mm cropped to 6x or the 4800 as taken?

I think his demo was to illustrate what is possible, rather than suggest we have to go to those extremes to get a good telephoto shot.

Comments?

Rongnongno Loc: FL

Link to the article?

Billbobboy42 Loc: Center of Delmarva

Rongnongno wrote:

Link to the article?

All I can find, at the end of the article, is visit the OPTV section of outdoorphotographer.com.

DigitalDon Loc: Calgary, Alberta

You cannot stack multipliers unless you do some "pin filing". Probably not a wise idea unless you know what you are doing. Guessing I would say the multiplier stacking would be the sharper image rather than cropping. Once you get to high megapixel (36 for Nikon D800) there is really no need for multiplier stacking. Just my HO.

OonlyBonly

Right click > Search DuckDuckGo
http://www.outdoorphotographer.com/how-to/shooting/eagle-eyes.html#.U0Q_AldiLV0

daveaddo Loc: Gods own county, Yorkshire

I have stacked Canon 1.4 and 2.0 teleconvertors along with a Tamron 2.0 without filing anything. The results were better than I ever expected, but obviously you do lose some quality. This combination was used on a Canon 7D with a 300mm 2.8 lens.

clintonnnn Loc: Goldendale,WA

Is there a extender that works with the new Tamron 150-600 and Canon bodies?

Billbobboy42 Loc: Center of Delmarva

OonlyBonly wrote:

Right click > Search DuckDuckGo
http://www.outdoorphotographer.com/how-to/shooting/eagle-eyes.html#.U0Q_AldiLV0

Thanks for the link, but I could not navigate past page 2. It did show the other inset where he attached 3 2x + 1.4x to a Canon 7D. However, if anyone can access the 6 pics take a look. All I have is the hard copy magazine.

Haydon

DigitalDon wrote:

You cannot stack multipliers unless you do some "pin filing". Probably not a wise idea unless you know what you are doing. Guessing I would say the multiplier stacking would be the sharper image rather than cropping. Once you get to high megapixel (36 for Nikon D800) there is really no need for multiplier stacking. Just my HO.

Yes, you can surprisingly enough but it requires you to add extension tubes with the newer bodies. Arthur Morris has written about it many times. There's several threads also on Canon Rumors about it as well.

Haydon

daveaddo wrote:

I have stacked Canon 1.4 and 2.0 teleconvertors along with a Tamron 2.0 without filing anything. The results were better than I ever expected, but obviously you do lose some quality. This combination was used on a Canon 7D with a 300mm 2.8 lens.

If there is one lens where extenders work well in the Canon lineup it's the 300 2.8 claimed to be by many as the sharpest lens they make.

DigitalDon Loc: Calgary, Alberta

If you DON't use extension tubes, can you stack them? I have a friend who is very good at things, he shoots Canon and cannot stack multipliers. He has tried a lot of times.

bull drink water Loc: pontiac mi.

here is my shot, with the pentax 645D I have stacked 2 2x and 1 1.4x easy fit. I have used them on the 645 200mm and the 400mm,also on the 6x7 300mm. with 2 2x's the images were good, adding the 1.4x cut the image quality.a tripod,remote or timer, and high shutter speeds are a must.
as for my full frame sony I have stacked a 1.4x and 2 2.0x's off brands with some good results. as with the canon teleconverters that he used and the sony's that I have some kind of spacer is necessary. I havn't found any yet.

SharpShooter Loc: NorCal

DigitalDon wrote:

If you DON't use extension tubes, can you stack them? I have a friend who is very good at things, he shoots Canon and cannot stack multipliers. He has tried a lot of times.

Don, I have heard several times that you can stack the older ones, but not the newer mklll TC's. I don't know if that's fact. But if so, could account for the stackability/non-stackability issue. ;-)
SS

bull drink water Loc: pontiac mi.

DigitalDon wrote:

You cannot stack multipliers unless you do some "pin filing". Probably not a wise idea unless you know what you are doing. Guessing I would say the multiplier stacking would be the sharper image rather than cropping. Once you get to high megapixel (36 for Nikon D800) there is really no need for multiplier stacking. Just my HO.

the high end ones need modification or spacers. the off brends like kenko, pro- optec, and vivitar stack at the drop of a hat. I do it all the time.

bioteacher Loc: Brooklyn, NY

Tamron makes extenders:

http://www.tamron-usa.com/lenses/prod/teleconverters.asp

http://www.bhphotovideo.com/c/search?Ntt=tamron+Teleconverters&N=0&InitialSearch=yes&sts=ma&Top+Nav-Search=

Says these are for lenses 90mm & greater.