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**barondla** · 11-02-2020, 07:13 PM

The 80-160 has a neat rotating filter ring making it easier to use polarizing filters. Do any other 645 lens have this feature?

Thanks,
barondla

WhatsMyNameAD67 · 11-02-2020, 08:52 PM - **1 Like**

Ive not seen any. It’s a neat feature, though! Here’s a link to other 645’s- http://www.ricoh-imaging.co.jp/japan/products/lens/images/645_Mount_Lens.pdf

**RICHARD L.** · 11-03-2020, 05:44 AM - **1 Like**

I think it's the only 645 lens with this feature. I have 16 other 645 Focal Lengths and none have this filter wheel, not even the older A 80-160 mm f/4.5.

Regards

**barondla** · 11-03-2020, 07:17 AM

Originally posted by RICHARD L.

I think it's the only 645 lens with this feature. I have 16 other 645 Focal Lengths and none have this filter wheel, not even the older A 80-160 mm f/4.5.

Regards

Thanks. The lens roadmap posted above shows 2 lenses that were supposed to come out in 2017 or beyond? Guessing it didn't happen? Did we ever hear more info on them?

Thanks,
barondla

torashi · 11-03-2020, 07:38 AM - **1 Like**

Wow, didn't know this. I only have A primes.

**kaseki** · 11-04-2020, 08:11 AM - **1 Like**

The Pentax DFA 645 f/4 25mm AL[IF] SDM AW has a filter wheel for the supplied CP filter that can be inserted mid body to replace a "natural" glass proxy. (We can assume that the time it takes light to travel through the CP filter is matched by that of the natural filter: thickness/index of refraction; dispersion might be closely matched also.)

There are some deep hoods with ports that provide a means of rotating conventional front CP filters.

Edit: Now that I think about it, I recall an image of the monster 645 600 mm having a similar device near its narrow end.

**yurihuta** · 11-04-2020, 08:23 AM - **1 Like**

Originally posted by barondla

The 80-160 has a neat rotating filter ring making it easier to use polarizing filters. Do any other 645 lens have this feature?

Thanks,
barondla

While it may not be a filter wheel, the FA 150mm f/2.8 hood has a piece that slides out to give access to the filter (so you can turn it). I think the FA 35mm has this feature too (I sold my copy) as does the FA 45-85mm f/4.5

**barondla** · 11-04-2020, 08:50 AM

Interesting info. Thanks everyone.

Funny story. The FA 80-160 was my second lens for the 645Z (first was the A 120 macro). Like most, I bought the lens used and didn't receive any instructions with it. On the first shoot I remove the lens hood to install a polarizer. Oh no, the whole front of the lens is loose and spinning. I carefully got the filter installed and finished shooting. Feared the whole front element was going to fall out of the lens. Worried the whole time about how I was going to fix the lens. Hours later I finally figure out the lens was designed this way. Doh.

Thanks,
barondla

11-02-2020, 07:13 PM	#1
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717	Rotating filter ring The 80-160 has a neat rotating filter ring making it easier to use polarizing filters. Do any other 645 lens have this feature? Thanks, barondla

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11-02-2020, 08:52 PM - 1 Like	#2
WhatsMyNameAD67 Veteran Member Join Date: Sep 2018 Posts: 307	Ive not seen any. It’s a neat feature, though! Here’s a link to other 645’s- http://www.ricoh-imaging.co.jp/japan/products/lens/images/645_Mount_Lens.pdf

11-03-2020, 05:44 AM - 1 Like	#3
RICHARD L. Loyal Site Supporter Join Date: Oct 2018 Location: Quebec City, Quebec Posts: 6,653	I think it's the only 645 lens with this feature. I have 16 other 645 Focal Lengths and none have this filter wheel, not even the older A 80-160 mm f/4.5. Regards

11-03-2020, 07:17 AM	#4
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717 Original Poster	Originally posted by RICHARD L. I think it's the only 645 lens with this feature. I have 16 other 645 Focal Lengths and none have this filter wheel, not even the older A 80-160 mm f/4.5. Regards Thanks. The lens roadmap posted above shows 2 lenses that were supposed to come out in 2017 or beyond? Guessing it didn't happen? Did we ever hear more info on them? Thanks, barondla

11-03-2020, 07:38 AM - 1 Like	#5
torashi Veteran Member Join Date: Sep 2017 Location: Medellín Posts: 1,322	Wow, didn't know this. I only have A primes.

11-04-2020, 08:11 AM - 1 Like	#6
kaseki Loyal Site Supporter Join Date: Dec 2017 Photos: Gallery \| Albums Posts: 1,138	The Pentax DFA 645 f/4 25mm AL[IF] SDM AW has a filter wheel for the supplied CP filter that can be inserted mid body to replace a "natural" glass proxy. (We can assume that the time it takes light to travel through the CP filter is matched by that of the natural filter: thickness/index of refraction; dispersion might be closely matched also.) There are some deep hoods with ports that provide a means of rotating conventional front CP filters. Edit: Now that I think about it, I recall an image of the monster 645 600 mm having a similar device near its narrow end.

11-04-2020, 08:23 AM - 1 Like	#7
yurihuta Site Supporter Join Date: Nov 2008 Location: Washington DC, USA Photos: Albums Posts: 632	Originally posted by barondla The 80-160 has a neat rotating filter ring making it easier to use polarizing filters. Do any other 645 lens have this feature? Thanks, barondla While it may not be a filter wheel, the FA 150mm f/2.8 hood has a piece that slides out to give access to the filter (so you can turn it). I think the FA 35mm has this feature too (I sold my copy) as does the FA 45-85mm f/4.5

11-04-2020, 08:50 AM	#8
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717 Original Poster	Interesting info. Thanks everyone. Funny story. The FA 80-160 was my second lens for the 645Z (first was the A 120 macro). Like most, I bought the lens used and didn't receive any instructions with it. On the first shoot I remove the lens hood to install a polarizer. Oh no, the whole front of the lens is loose and spinning. I carefully got the filter installed and finished shooting. Feared the whole front element was going to fall out of the lens. Worried the whole time about how I was going to fix the lens. Hours later I finally figure out the lens was designed this way. Doh. Thanks, barondla

Rotating filter ring

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