Canon 1.4 or Tamron extender? (Page 2): Thank you. I didn't know that.

Bill Golden Loc: Briarcliff NY

mwsilvers wrote:

Canon extenders are designed for a select group of Canon L lenses. They are generally not suitable with lenses that are not explicitly on the compatibility list.

Thank you. I didn't know that.

Bill Golden Loc: Briarcliff NY

Fotoserj wrote:

To begin, canon won’t fit on tamron, this being said my 1,4 is almost permanently affix to my 100-400 I loose a bit of definition at 400 but it’s offset by the range I gain

Thank you. Very useful information.

dave.m

mwsilvers wrote:

I am surprised that you are able to use a Canon Extender with a Sigma lens.

i'll take a couple of test shots when I get back tonight and post / with exif works well with macro as as I get 150 f/2.8 or 210mm f/4

nobody told me I couldn't so I just did. Also used it with a Sigma 70-200 f2.8 without problems. Can't speak for any other manufactuer as don't have any but Sigma a pretty good on Canon Comaptability.

Most autofocus issues result because many cameras need f5.6 or thereabouts to autofocus. Can't get that if you start with aperture greater than f4 (or f2.8 using a x2 TC) before adding TC. It doesn't matter what aperture you set (except in M of course) as all (?) cameras focus at max aperture before stopping down to shoot.

dave.m

mwsilvers wrote:

I am surprised that you are able to use a Canon Extender with a Sigma lens.

Here are a couple of frames. Hand held, lighting with LED desktop lamp, so no great images! Didn't even clean the watch (see fingerprint over date.)

Only processing is to convert raw to jpg with Fastone Image Capture for this post. Exif from FS capture shows 1st with 150mm lens, 2nd is with canon extender x1.4 III. Apeture set at f/8, shutter speed and ISO auto. Taken at about the same distance. Images have not been resized if you wish to zoom to 100%, but if you really want to check IQ at this magnification it should be taken with a tripod of course.

dave.m

dave.m wrote:

Here are a couple of frames. Hand held, lighting w... (show quote)

Just checked image from website and it appears to have been resized and dunno how to upload original full size

CHG_CANON Loc: the Windy City

dave.m wrote:

Just checked image from website and it appears to have been resized and dunno how to upload original full size

dave.m

when unsure RTFM :)

billnikon Loc: Pennsylvania/Ohio/Florida/Maui/Oregon/Vermont

Bill Golden wrote:

I have a Canon 7d ii and a Tamron 100-400 mm lens. Does anyone have any experience using the Canon or the Tamron extenders? I am interested in feedback about image quality and maintaining autofocus. Thank you.
Bill

No extender improves image quality. Since you have a Tamron, I would go with the Tamron (but personally I would not add an extender to any zoom lens. BUT, your focusing speed will decrease and your image quality at 400 mm will suffer.

Architect1776 Loc: In my mind

legion3 wrote:

TAMRON 1.4 IS MATCHED FOR TAMRON LENSES

Bill Golden Loc: Briarcliff NY

billnikon wrote:

No extender improves image quality. Since you have a Tamron, I would go with the Tamron (but personally I would not add an extender to any zoom lens. BUT, your focusing speed will decrease and your image quality at 400 mm will suffer.

Thank you.

Architect1776 Loc: In my mind

Bill Golden wrote:

Thank you.

Try a 1.4X or 2X MIII on a 100-400mm MII and you will eat those words.

franbires

Do you lose all focal points, with the exception of the center single point with the 1.4 extender with a 5D IV matched with the 100-400 II lens?

dave.m

billnikon wrote:

No extender improves image quality. Since you have a Tamron, I would go with the Tamron (but personally I would not add an extender to any zoom lens. BUT, your focusing speed will decrease and your image quality at 400 mm will suffer.

An extender will not improve, and in fact reduces image quality. But everything is a trade-off. In this case - for me - does the cost, and weight + bulk advantage in the camera bag, of a TC vs. another lens give me an advantage?

I tested this quite easily - could I reduce weight and bulk if I used a 100-400+TC rather than carry a 150-600? Also for me, my default lens is a 24-105 so I would have a continuous focal range of 24-600+ with 2 lenses. In fact I sold a good 150-600 Tamron after buying the x1.4 TC for the 100-400 as IQ of Canon +TC was better than the excellent Tamron (and anyone could argue 'so it should be given the total cost'.)

As to IQ, that was also easy to test providing you can get access to the kit.
- I checked side by side image quality centre and corners at 100% of the 100-400 at 400. This is baseline and I expected to be best.
- I then repeated the test with the lens +TC combo at approx 400 (so I could compare like for like with the bare lens and lens+TC.)
- then checked at max lens + TC (640mm)
- also checked a crop of the bare lens with lens+TC enlarged to similar size
- for curiosity as I had the lens I compared with the Tamron 150-600 (v1)

Results were pretty much as you would expect - bare lens was best,lens+TC results at similar focal length were not as good, and at max were also less sharp but much better than I expected and perfectly good for display or printing at 100% or less. The all important crop enlargement was not as good as the lens+TC (otherwise whats the point of a TC if an enlarged crop of the same area is as good or better!)

Initially, the main surprise was that the Canon 100-400+TC was better than the Tamron at 600 - again on reflection this is not surprising given the huge cost differential and that the Canon was a new v2 lens and the Tamron an older v1.

I would also mention with my camera/lens combinations there was no noticeable impact on focusing because even with TC the maximum aperture was withing the autofocus range (a x2 would not have been and would have hunted or probably failed to focus.)

I would emphasise my testing though careful, was empirical and subjective, but I would always advise before anyone spends shed loads, to test the actual equipment they intend to purchase!

dave.m

dave.m wrote:

An extender will not improve, and in fact reduces image quality. But everything is a trade-off. In this case - for me - does the cost, and weight + bulk advantage in the camera bag, of a TC vs. another lens give me an advantage?

I tested this quite easily - could I reduce weight and bulk if I used a 100-400+TC rather than carry a 150-600? Also for me, my default lens is a 24-105 so I would have a continuous focal range of 24-600+ with 2 lenses. In fact I sold a good 150-600 Tamron after buying the x1.4 TC for the 100-400 as IQ of Canon +TC was better than the excellent Tamron (and anyone could argue 'so it should be given the total cost'.)

As to IQ, that was also easy to test providing you can get access to the kit.
- I checked side by side image quality centre and corners at 100% of the 100-400 at 400. This is baseline and I expected to be best.
- I then repeated the test with the lens +TC combo at approx 400 (so I could compare like for like with the bare lens and lens+TC.)
- then checked at max lens + TC (640mm)
- also checked a crop of the bare lens with lens+TC enlarged to similar size
- for curiosity as I had the lens I compared with the Tamron 150-600 (v1)

Results were pretty much as you would expect - bare lens was best,lens+TC results at similar focal length were not as good, and at max were also less sharp but much better than I expected and perfectly good for display or printing at 100% or less. The all important crop enlargement was not as good as the lens+TC (otherwise whats the point of a TC if an enlarged crop of the same area is as good or better!)

Initially, the main surprise was that the Canon 100-400+TC was better than the Tamron at 600 - again on reflection this is not surprising given the huge cost differential and that the Canon was a new v2 lens and the Tamron an older v1.

I would also mention with my camera/lens combinations there was no noticeable impact on focusing because even with TC the maximum aperture was withing the autofocus range (a x2 would not have been and would have hunted or probably failed to focus.)

I would emphasise my testing though careful, was empirical and subjective, but I would always advise before anyone spends shed loads, to test the actual equipment they intend to purchase!

An extender will not improve, and in fact reduces ... (show quote)

Oops! that should be 400x1.4 = 560mm max

elliott937 Loc: St. Louis

Been there. Done that! I tried an off brand extender for my Canon camera. Not good. Then spent the money on the Canon brand extender, and now on my 100-400 L lens, sharp as can be.

By the Canon brand....and I'm not an employee of Canon. lol