The 25-pack antique white 8 x 10" 2-Ply 100% Cotton Museum Board from Archival Methods is suitable for matting, mounting, and preserving valuable documents, fine prints, and photographs. When used for window mats and mat backing for small prints, the 2-ply thickness of each museum board provides a 1/32" separation between artwork and glazing, thus providing flat and sturdy support. Made of 100% cotton fiber without any brightening agents, this museum board is acid and lignin-free and ensures protection against the destructive effects a polluted environment might cause as your artwork ages.

For Matting & Mounting Fine Art Prints    Acid and Lignin-Free Cotton Fiber    Protected Against Acidic Destruction    100% Cotton Fiber

100% cotton fiber pulp (99% alpha cellulose). It does not contain any post consumer waste recycled pulp. Paper is free of metal particles, waxes, plasticizers, and residual bleach peroxide. Sulfur content is less than 0.0008% reducible sulfur. Iron content does not exceed 150ppm and copper does not exceed 6ppm. No optical brightening agents are used in the pulp.

Alkaline sizing is used for both internal and external sizing. No alum is used in the manufacturing process.

Buffered with calcium carbonate 2 to 3% alkaline reserve; pH 9 ± 0.5; and acid-free.

Color dyes are light-fast and non-bleeding.

Pass the PAT (Photographic Activity Test) ISO 14523 (formerly ANSI IT9.16).

Lignin content is tested by TAPPI 236 cm-85 and has a Kappa number of less than 5.

The single ply sheets are laminated together using all natural starch adhesive.

Related Questions and Answers

Q: 1. I am agonizing over whether to get the much less expensive Sigma 150-600 or save my pennies for a while and get this lens. With the Sigma I'd get 200 more mm of reach, but since I am using a Canon 7D Mark II and could put the 1.4x on it and still have center AF, I'm in a quandary as to which way to go. Given that I would primarily use whichever lens I get for Birds and Wildlife, what would be the biggest reasons to spend 2x the $$ for this lens over a Sigma with more reach? Especially interested in hearing from folks who have used both.

A: The Sigma is as heavy as a bear, I sold it and bought the Tamron 150-600mm G2, which is great for distance shots with the extenders Tamron makes. But for sharp flight shots I purchased the Canon 100-400. Look at the reviews and the photo's attached and you see why!

Q: 2. When adapted to the R5/R6 bodies is this lens compatible with the animal eye detect in continuous AF/servo mode?

A: When adapted to the Canon R5/R6 body, the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens BH #CA1004002LIS is compatible with the animal eye detect in continuous AF/servo mode.

Q: 3. Hola, estoy interesado en comprarlo y que me lo enven a mi casa... Yo vivo en Bogot-Colombia.Que cost tendra? Que debo hacer ? con quien debo comunicarme ? Muchas gracias!.

A: Para ver mas informacion sobre los envios, Ponga todas los productos que usted quiere comprar en el carrito, y oprimes ver carrito. En la siguiente pagina vas a poner la dirrecion completo postal de la destinacion y vas a oprimir el boton que dice Realizar El Pago. El la siguiente pagina vas a poner la direccion de envio. En la proxima pagina vas a ver las varias opciones de envio, con los gastos y tiempo estimado de dia de entrega. En respect a los gastos de la Aduana, nosotros no tenemos informacin sobre los gastos de la Aduana. Tendra que comunicarse con la empresa que usted quiere que le haga el envio, por ejemplo UPS o FedEx, para que le puedan dar mas informacin sobre esos gastos.

Q: 4. Can I use this lense for Canon 7D ?

A: Yes works great!!!

Q: 5. Is the tripod mount on the attached collar ARCA compatible?

A: No it does not. I added a plate on the foot.

Q: 6. How sharp is the new 100mm-400mm compared to the 5.6 400mm prime?

A: I am a 76 year old woman, average size...I can't believe how great this lens is. I shoot hand held and am happy to report this lens is sharp. I have never used the 400 prime and the reason I bought the 100-400 was weight and versatility considerations. I am so very happy to enjoy the freedom of hand held shooting with excellent results. I highly recommend this lens. btw, have used it hand held on Whale Watching trips (sharp tails) birding etc...just a real delight to use.

Q: 7. What settings for image stabilization are recommended for use with this lens when paired with a E1-mkIII body? In camera only, lens only, or both. I typically take hand held photos of birds at high magnification.

A: It is recommended to use both IBIS as well as lens OIS. Certain axes are more easily stabilized in-lens, and certain axes in-camera. Toggling both on will allow the camera to more accurate compensate for motion.

Q: 8. is the Canon Extender EF 1.4X II compatible with this lens? I am curious if I need to upgrade to the III version.

A: Yes it works with this lens.

Q: 9. Is this lens compatible with the 5DS?

A: Yes it us compatible with the 5DS, if by compatible you mean will it mount on the body and function completely. I do not have a 5DS but this lens was developed quite recently, probably near the same time period as the 5DS was being developed. Contact Canon if you have more specific questions or concerns.

Q: 10. Can the Panasonic DMW-TC14 1.4x teleconverter fit with this lens?

A: Yes, the Panasonic DMW-TC14 1.4x teleconverter will accommodate the following lens system.