More versions of old 645 FA lenses ?

Andrea K · 09-14-2021, 07:38 AM

Hi,

I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products | RICOH IMAGING

According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology?

Last edited by Andrea K; 09-14-2021 at 07:59 AM.

AfterPentax Mark II · 09-14-2021, 07:51 AM

If you take a look at the APS-C SMC *versions you will notice that they also have the SP coating. I guess it has to do with being a star lens.

angerdan · 09-15-2021, 03:51 AM

Originally posted by Andrea K

how is possible considering that these lenses are old designs and the SP coating is a more recent technology?

It's all the same lens versions.
https://en.wikipedia.org/wiki/Template:Pentax_645-mount_lenses_timeline

SP coating is dated back to 2007, so it's possible lenses got SP coating from then on.
Pentax Announces New DA* Lenses and Other Accessories - PentaxForums.com

Andrea K · 09-15-2021, 07:58 AM

Originally posted by angerdan

It's all the same lens versions.
Template:Pentax 645-mount lenses timeline - Wikipedia

wikipedia is not a valid source

Originally posted by angerdan

SP coating is dated back to 2007, so it's possible lenses got SP coating from then on.
Pentax Announces New DA* Lenses and Other Accessories - PentaxForums.com

Ok, this could be possible but why only these two 645 lenses?

angerdan · 09-15-2021, 08:52 AM

Originally posted by Andrea K

wikipedia is not a valid source

Wikipedia isn't the source, it's just the output of several sources (brochures, lens database, pricelists):
Pentax 645-mount lenses timeline - please contribute - PentaxForums.com

Fogel70 · 09-15-2021, 08:58 AM - **1 Like**

Originally posted by Andrea K

Hi,

I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products | RICOH IMAGING

According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology?

According to this info FA* 645 300mm F4 also have quick-shift, which is does not have.

**kaseki** · 09-15-2021, 08:59 AM

Originally posted by Andrea K

Hi,

I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products | RICOH IMAGING

According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology?

To answer the literal question: If a lens assembly is still in production, the coatings can be changed at any time. Better coatings improve transmission and reduce the intensity of Boys points when pointing near a bright light. Finger print suppression is also helpful.

Modern coatings are stacks of layers only wavelengths thick, so they do not affect the power of the optics to bend light.

For enough money, one can have coatings stripped and replaced with better ones.

09-14-2021, 07:38 AM	#1
Andrea K Pentaxian Join Date: Mar 2009 Location: Rome, Italy Posts: 822	More versions of old 645 FA lenses ? Hi, I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products \| RICOH IMAGING According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology? Last edited by Andrea K; 09-14-2021 at 07:59 AM.

09-14-2021, 07:51 AM	#2
AfterPentax Mark II Pentaxian Join Date: Mar 2021 Posts: 1,462	If you take a look at the APS-C SMC versions you will notice that they also have the SP coating. I guess it has to do with being a star lens. Last edited by AfterPentax Mark II; 09-14-2021 at 07:53 AM. Reason: unquoting the quote*

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09-15-2021, 03:51 AM	#3
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,639	Originally posted by Andrea K how is possible considering that these lenses are old designs and the SP coating is a more recent technology? It's all the same lens versions. https://en.wikipedia.org/wiki/Template:Pentax_645-mount_lenses_timeline SP coating is dated back to 2007, so it's possible lenses got SP coating from then on. Pentax Announces New DA* Lenses and Other Accessories - PentaxForums.com

09-15-2021, 07:58 AM	#4
Andrea K Pentaxian Join Date: Mar 2009 Location: Rome, Italy Posts: 822 Original Poster	Originally posted by angerdan It's all the same lens versions. Template:Pentax 645-mount lenses timeline - Wikipedia wikipedia is not a valid source Originally posted by angerdan SP coating is dated back to 2007, so it's possible lenses got SP coating from then on. Pentax Announces New DA* Lenses and Other Accessories - PentaxForums.com Ok, this could be possible but why only these two 645 lenses?

09-15-2021, 08:52 AM	#5
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,639	Originally posted by Andrea K wikipedia is not a valid source Wikipedia isn't the source, it's just the output of several sources (brochures, lens database, pricelists): Pentax 645-mount lenses timeline - please contribute - PentaxForums.com

09-15-2021, 08:58 AM - 1 Like	#6
Fogel70 Pentaxian Join Date: Sep 2009 Location: Stockholm, Sweden Photos: Albums Posts: 3,062	Originally posted by Andrea K Hi, I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products \| RICOH IMAGING According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology? According to this info FA* 645 300mm F4 also have quick-shift, which is does not have.

09-15-2021, 08:59 AM	#7
kaseki Loyal Site Supporter Join Date: Dec 2017 Photos: Gallery \| Albums Posts: 1,138	Originally posted by Andrea K Hi, I was on the RICOH japan site: Lens list for Medium-format Digital single-lens reflex camera / Lens lineup/ Lenses / Products \| RICOH IMAGING According to this site it seems that the FA* 645 300mm F4 and the FA 645 150-300mm have the SP Coating to repel dirt and fingerprints from the front lens...how is possible considering that these lenses are old designs and the SP coating is a more recent technology? To answer the literal question: If a lens assembly is still in production, the coatings can be changed at any time. Better coatings improve transmission and reduce the intensity of Boys points when pointing near a bright light. Finger print suppression is also helpful. Modern coatings are stacks of layers only wavelengths thick, so they do not affect the power of the optics to bend light. For enough money, one can have coatings stripped and replaced with better ones.