Store your photographic materials safely by using Archival White Paper from Archival Methods as a form of interleaving paper or protective cover for your media. The paper is made from alpha cellulose with 25% cotton fiber content and is calcium carbonate buffered as well as both acid and lignin free for preventing degradation of your photographs. It has a basis weight of 120 gsm and passes the Photographic Activity Test (PAT) as indicated in ISO IT 18916. Additionally, it was made in the USA.

Alpha Cellulose and Cotton Fiber Base    Safely Store Photographic Materials    Passes Photographic Activity Test    Basis Weight: 120 gsm    Calcium Carbonate Buffered    Acid and Lignin Free    Made in the USA

Made from alpha cellulose wood pulp with 25% cotton fiber content to create a durable, white paper with a basis weight of 120 gsm.

Uses calcium carbonate as a buffer with 2-3% alkaline reserve, measured to a pH of 9 ±0.5 and being acid free.

This media passes the PAT (Photographic Activity Test) as indicated by ISO IT 18916, which is formerly ISO 14523 ANSI IT9.16.

Sulfur content is measured to less than 0.0008% reducible sulfur.

Lignin content is measured to TAPPI 236 cm-85 standards and has a Kappa number of less than five.

Related Questions and Answers

Q: 1. Which lens is better overall (build quality, weather sealing, image quality, focus and value) the Sigma AF 150-600 F/5-6.3 DG OS HSM C or the Sigma 100 - 400mm F5-6.3 DG OS C?

A: Both lenses are under the Sigma Contemporary line. They have the same construction. Optical quality on the Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens slightly higher considering you have a longer zoom range.

Q: 2. How does this compare with the Tamron 100-400mm f/4.5-6.3 Di VC USD Lens on a Nikon D850?

A: They are both similar in quality, but the Sigma Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary does seem to be slightly sharper than the Tamron version.

Q: 3. When converted to EF mount, is it compatible with RED DSMC1 & 2 cameras?

A: Yes, as long as your RED DSMC1 or DMSC2 camera is using an EF mount, the DZOFilm Pictor 14-30mm Lens will be compatible.

Q: 4. Which mount comes preinstalled?

A: The DZOFilm Pictor has the PL mount attached to the lens. It comes with an EF mount adapter, that you would attach to the lens. See Page 8 https://www.bhphotovideo.com/lit_files/951702.pdf

Q: 5. Will this lens work on a Nikon D3200?,when I click on compatibility 3200 isn't there.

A: According to Sigma's compatibility list located at https://www.sigma-global.com/en/lenses/cas/product/popups/lenses-correspondence/, it is compatible.

Q: 6. I use a Canon 70D and currently have a Sigma 18-300mm....is it worth the money and why to buy a Sigma 100-400mm ?

A: This is a nice lens, light and sharp. I use it for a while. The quality of picture is good enough in day light. But it is not fast lens, it is not good in low light.

Q: 7. On a Sony A7r 4 (or 3) will the steady shot work on video..Like the Sony OSS lenses? Thx

A: The lens would have full functionality with the MC-11 adapter when mounted on the A7R III or A7R IV, including stabilization.

Q: 8. Does this lens come with a lens hood?

A: Yes , hood is included

Q: 9. How's the autofocus speed and accuracy and the OS ? As many reviews says these are the thumbs down.

A: I think it's pretty good actually. I use mine for taking bird photos mostly and I'm happy the speed of autofocus and the overall results.

Q: 10. Is the sigma 100-400 compatible with a Nikon D7000?

A: I had read recently that as long as the D7000 has the latest update, that it would be compatible. So I tried it with mine yesterday, and it seemed to function very well. The autofocus was very fast, and all of the exposure readings functioned as well. It was during the late afternoon/evening hours with overcast, so the lighting wasn't all that great, but it functioned as expected.