Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-14-2021, 07:38 AM   #1
Pentaxian
Andrea K's Avatar

Join Date: Mar 2009
Location: Rome, Italy
Posts: 731
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
Veteran Member
AfterPentax Mark II's Avatar

Join Date: Mar 2021
Posts: 524
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
09-15-2021, 03:51 AM   #3
Pentaxian
angerdan's Avatar

Join Date: Feb 2015
Photos: Gallery | Albums
Posts: 2,030
QuoteOriginally posted by Andrea K Quote
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
Pentaxian
Andrea K's Avatar

Join Date: Mar 2009
Location: Rome, Italy
Posts: 731
Original Poster
QuoteOriginally posted by angerdan Quote
wikipedia is not a valid source

QuoteOriginally posted by angerdan Quote
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
Pentaxian
angerdan's Avatar

Join Date: Feb 2015
Photos: Gallery | Albums
Posts: 2,030
QuoteOriginally posted by Andrea K Quote
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
Pentaxian
Fogel70's Avatar

Join Date: Sep 2009
Location: Stockholm, Sweden
Photos: Albums
Posts: 2,446
QuoteOriginally posted by Andrea K Quote
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
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2017
Photos: Gallery | Albums
Posts: 996
QuoteOriginally posted by Andrea K Quote
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.

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
645d, 645z, camera, fa, fa lenses, lens, lenses, medium format, ricoh, site
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone compare 645 FA 80-160 vs 645 FA 200? barondla Pentax Medium Format 19 07-19-2020 11:29 AM
For Sale - Sold: Pentax 645 FA 35mm and Pentax 645 FA 75mm (SOLD) loveisageless Sold Items 2 12-06-2019 10:52 PM
Any change Pentax will make SDM versions of its old FA lenses? davide Pentax SLR Lens Discussion 18 12-04-2017 05:54 AM
Sigma 8-16mm vs 10-20mm old and new versions catastrophe Pentax SLR Lens Discussion 28 01-14-2014 06:12 PM



All times are GMT -7. The time now is 08:19 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top