Metol(Elon) Developing Agent is used as a developing agent, usually with hydroquinone, but sometimes by itself as in Kodak D-23.

Although metol is easily soluble in water, it is not soluble in a strong sodium sulfite-solution. It does dissolve readily in a weak solution of sulfite. Metol bulds image detail rapidly, and it keeps well in solution.

Metol has low-fogging tendencies and responds well to the addition of bromide, giving a very clean-working developer without any staining of film or fingers.

The energy of the developer is only slightly affected by low temperature and is only slightly reduced by the addition of bromide.

Metol alone with either sodium or potassium carbonates give a rapid working developer when the alkalies are in high concentration, but the speed of the development can easily be controlled by dilution.

The use of caustic alkali (e.g., sodium hydroxide) is not recommended with metol as there is a tendency to excessive fog. When used with sulfite alone, without additional alkali (Kodak D-230, metol provides a slow-working, fine-grain developer. This type of film developer often works well with a mild alkali, such as borax, which accelerates the rate of development without increasing the grain size appreciably (Kodak D-25).

Developers containing metol as the sole developing agent are not widely used but metol with hydroquinone provides the most widely used developer combination.

Related Questions and Answers

Q: 1. Just wondered how the rf 100-400 image quality would compare with an L 100-400 lens?

A: The Canon RF 100-400mm f/5.6-8 IS USM Lens is new nad in pre-order only. There are at this time no comparesons between that and the Canon EF 100-400mm f/4.5-5.6L IS II USM Lens In general is best to use a lens direct verses using a lens with a lens adapter. Note the EF lens is a about a stop better in low light. So in some situations that that can very important.

Q: 2. Is this good for sports such as HS soccer with an R7?

A: The Canon RF 100-400mm f/5.6-8 IS USM Lens attached to the Canon EOS R7 Mirrorless Camera is suitable for sports.

Q: 3. How is the auto focus on this lens? I have 2 bodies, the R6 and the RP.

A: The lens offers a autofocus that is nearly instantaneous! As well very sharp.

Q: 4. Will it fit a canon m50?

A: Unfortunately, the Canon RF 100-400mm f/5.6-8 IS USM Lens is not compatible with the Canon M50.

Q: 5. Is this dust proof? I'm in desert like areas with lots of drinking/dust and worried about lifespan of lens? So wondering if l series would be better?

A: This RF lens is weathered sealed. However you will want to over the front and rear elements high dust areas like any other lens.

Q: 6. Does this come with a little pouch for storage?

A: The Canon RF 100-400mm f/5.6-8 IS USM Lens does not come with a storage pouch. This Op-tech pouch would be a good option: https://bit.ly/3uvyKll

Q: 7. Does it come with a lens hood

A: The RF 100-400mm f/5.6-8 IS USM does not include a lens hood. A compatible lens hood is the Canon ET-74B Lens Hood, BH # CAET74B

Q: 8. At 400mm, can the aperture stay at F5.6?

A: The max aperture when the Canon RF 100-400mm f/5.6-8 IS USM Lens is at 400mm will be f/8.

Q: 9. Is this compatble with olympus om-d e-m10 mark iii?

A: Unfortunately Canon RF lenses are not compatible with that Olympus camera.

Q: 10. Will this lens work with new Canon EOS R7?

A: Yes, the Canon RF 100-400mm f/5.6-8 IS USM Lens is compatible with the Canon R7.