batterup55

With the current price reduction presently being offered on the Sigma 100-400 it within $50 of the Tamron 18-400. I want to buy a lightweight lens with a 400mm range for my wife and both are a consideration. Interested in how other members may fell about the topic in addition to comments from those having experience with either/both lens. Thanks

mas24 Loc: Southern CA

The Sigma 18-400mm is a highly mentioned lens on this forum. For the price of $649, it is affordable to many. It has very good reviews. It is a crop sensor designed lens. Whereas, the Sigma 100-400mm sells for $699. It is a full frame format lens. I'm sure it is not the same quality as Canon's 100-400mm "L" lens that goes for $2000. The Sigma prices are your best bargains. Good luck.

mas24 Loc: Southern CA

Correcting myself. I meant to say Tamron 18-400mm.

jerryc41 Loc: Catskill Mts of NY

It didn't notice any direct comparisons, but there are lots of reviews. See if reviews of the 18-400mm sound acceptable to you. It certainly has a good spread.

https://www.google.com/search?q=Sigma+100-400+vs+Tamron+18-400&rlz=1C1CHBF_enUS716US717&oq=Sigma+100-400+vs+Tamron+18-400&aqs=chrome..69i57j69i61.614j0j4&sourceid=chrome&ie=UTF-8

camerapapi Loc: Miami, Fl.

I have said in a couple of threads here that I have seen at a recent workshop on landscape photography by Tamron in Miami that I saw the images of the 18-400 and they looked very good to my eyes. It is very possible that the 100-400 with its shorter focal lengths will render better quality images.
Although I am sure someone here has used the 100-400 and I know of several that use the 18-400 I wonder if there will be someone that could give you good advise after using both lenses. I bet there is plenty of information in Flicker and also in other Internet sites, in case you are interested.
Tamron also has a very good customer relations department and they could give you a very good answer according to your needs.

3dees

I was ready to get the Sigma 100-400, but now Tamron has their 100-400. looks like faster auto focusing, and an optional tri-pod collar. I have a Tamron 16-300 and love it. the 18-400 should serve you well.

PHRubin Loc: Nashville TN USA

With the 18-400 she would not have to change lenses if she needed focal lengths in the normal to wide range. It is a good walk around lens. The 100-400 lens should give better IQ, especially on an APS-C body, but it would be hard to notice if you never print larger than 8 X 10.

Reinaldokool Loc: San Rafael, CA

If I never print larger than 8x10, my daughter's iPhone is sufficient. I always print at least 11x14 and often enough up to 20x30 and beyond from my a6300. I would not buy a lens which couldn't do that.

PHRubin Loc: Nashville TN USA

Since I never print that large, I can't speak from experience, but I suspect that even the 18-400 IQ beats an iPhone.

steinr98

After all said and done... the 18-400( on a crop Canon X 1.6 or a Nikon X 1.5) would be roughly 28mm x 640mm. In printed test results(using 13x19 glossy paper, shooting Raw and only using the Raw Converter in Light Rm with no real post processing to do the testing, using a 7D MK II) at our club, the 18-400 was softer than the Sigma 100-400 on the same camera body. The 18-400 is an amateur lens, and the tests done on line ,say so- it is pretty darn sharp - however the Sigma 100-400 is sharper, however a lot less range! The 100-400 is a sport lens for a particular purpose! So, what you really need to determine is.... How much of a sharp nut are you?? Only you can make the decision- I don't care how may entries you get in this form, you have to make the final decision as to what you like!! Again, "Beauty is in the eyes of the beholder"! All the write ups in the world cannot make that decision for you!! Borrow one of each or purchase from a company you can return it if you do not like it!!

imagemeister Loc: mid east Florida

Priorities:

Convenience = 18-400

Image quality = Sigma 100-400 .......

Simple !

..

tinplater Loc: Scottsdale, AZ

It is not just about how large you print...it is also about how much of the image you use. Higher image quality will give you better results if you want to crop a portion of the image.