Pentax smc DA 645 25mm f/4 AL (IF) SDM AW Lens filters

tk78 · 02-21-2015, 04:56 PM

Hello,
yesterday I bought 25mm lens for my 645z from second hand without manual instructions. I'm looking for something like manual pdf instruction or maybe someone can help me and describe (I'm amateur) what is this small filter 40.5mm inside my lens?

Thank You

Adam · 02-21-2015, 05:22 PM

It's just a rear-mounted drop-in filter, since there's no filter thread on the front of the lens. You can use traditional filter types such as ND, UV, or polarizers depending on your needs.

tk78 · 02-21-2015, 05:34 PM

Originally posted by Adam

It's just a rear-mounted drop-in filter, since there's no filter thread on the front of the lens. You can use traditional filter types such as ND, UV, or polarizers depending on your needs.

Hello Adam,
thank You. I understand but what is this horizontal scroll on the left from this release filter button?

Adam · 02-21-2015, 05:40 PM

Originally posted by tk78

Hello Adam,
thank You. I understand but what is this horizontal scroll on the left from this release filter button?

It's specifically designed for the circular polarizer filter, which should have been included. You have to be able to rotate the polarizer to apply it to different parts of the image.

Adam
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tk78 · 02-22-2015, 01:17 AM

Now, everything is correct for me, thank You

algrove · 03-05-2015, 03:44 PM

It also takes 40.5mm ND filters avialable from B&H.

**The Madshutter** · 03-19-2015, 01:46 AM

Hello tk78,

It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested.

algrove · 03-19-2015, 04:03 PM

Originally posted by The Madshutter

Hello tk78,

It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested.

Good excuse to come to Italy.

**The Madshutter** · 03-21-2015, 04:51 AM

Originally posted by algrove

Good excuse to come to Italy.

Indeed - one could experiment with their new filters on some beautiful scenery first, and enjoy some great food once off the fields as well

Fatlind · 09-28-2021, 11:11 PM

Originally posted by The Madshutter

Hello tk78,

It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested.

hu dear,
Are the ring, adapter and some filters for 25mm Pentax 645 wide angle still available?

02-21-2015, 04:56 PM	#1
tk78 New Member Join Date: Feb 2015 Posts: 10	Pentax smc DA 645 25mm f/4 AL (IF) SDM AW Lens filters Hello, yesterday I bought 25mm lens for my 645z from second hand without manual instructions. I'm looking for something like manual pdf instruction or maybe someone can help me and describe (I'm amateur) what is this small filter 40.5mm inside my lens? Thank You

02-21-2015, 05:22 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	It's just a rear-mounted drop-in filter, since there's no filter thread on the front of the lens. You can use traditional filter types such as ND, UV, or polarizers depending on your needs. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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02-21-2015, 05:34 PM	#3
tk78 New Member Join Date: Feb 2015 Posts: 10 Original Poster	Originally posted by Adam It's just a rear-mounted drop-in filter, since there's no filter thread on the front of the lens. You can use traditional filter types such as ND, UV, or polarizers depending on your needs. Hello Adam, thank You. I understand but what is this horizontal scroll on the left from this release filter button?

02-21-2015, 05:40 PM	#4
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by tk78 Hello Adam, thank You. I understand but what is this horizontal scroll on the left from this release filter button? It's specifically designed for the circular polarizer filter, which should have been included. You have to be able to rotate the polarizer to apply it to different parts of the image. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

02-22-2015, 01:17 AM	#5
tk78 New Member Join Date: Feb 2015 Posts: 10 Original Poster	Now, everything is correct for me, thank You

03-05-2015, 03:44 PM	#6
algrove Senior Member Join Date: Mar 2015 Posts: 160	It also takes 40.5mm ND filters avialable from B&H.

03-19-2015, 01:46 AM	#7
The Madshutter Site Supporter Join Date: Mar 2014 Location: Tuscany, Italy Posts: 1,255	Hello tk78, It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested.

03-19-2015, 04:03 PM	#8
algrove Senior Member Join Date: Mar 2015 Posts: 160	Originally posted by The Madshutter Hello tk78, It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested. Good excuse to come to Italy.

03-21-2015, 04:51 AM	#9
The Madshutter Site Supporter Join Date: Mar 2014 Location: Tuscany, Italy Posts: 1,255	Originally posted by algrove Good excuse to come to Italy. Indeed - one could experiment with their new filters on some beautiful scenery first, and enjoy some great food once off the fields as well

09-28-2021, 11:11 PM	#10
Fatlind New Member Join Date: Mar 2016 Posts: 12	Originally posted by The Madshutter Hello tk78, It is also possible to use traditional, rectangular filters with the 25mm if you want more flexibility in positioning your Grad ND and more choice of filters. You'll need the Formatt Hitech system, using the ring T 16-28 for tTokina lenses works just about perfectly with the Pentax 25mm 645 - since I sold the 25mm, I have one of such systems that needs to go, ring, adapter, a few filters and such. PM me if interested. hu dear, Are the ring, adapter and some filters for 25mm Pentax 645 wide angle still available?