Front element on the 15-30 f2.8 lens

**stemked** · 04-15-2021, 05:37 PM

Hi all.

I was looking at an image of the Pentax 15-30 f2.8 and it looks curved. Is that true? Is it possible to use filters on it? (ND, Polarizers)

Thanks

**mattt** · 04-15-2021, 05:41 PM

curved yes
Need to use frame like WonderPana, Nisi, etc.

**UncleVanya** · 04-15-2021, 05:43 PM

Originally posted by stemked

Hi all.

I was looking at an image of the Pentax 15-30 f2.8 and it looks curved. Is that true? Is it possible to use filters on it? (ND, Polarizers)

Thanks

Filters for Pentax 15-30mm lens - PentaxForums.com

That should help.

bertwert · 04-15-2021, 05:44 PM

The 15-30 does not have filter threads, however you can use filters with some sort of third party holder system.

Such as this for 145mm round filters:
WonderPana Filter Holder for Tamron 15-30mm SP F/2.8 Di VC USD (G1 & G ? Fotodiox, Inc. USA

Or this for 150mm square filters:
The LEE SW150 Mark II Filter System especially designed for a range of popular ultra-wideangle lenses.

If you search the forums you should be able to find some older threads on that topic.

stevebrot · 04-15-2021, 05:44 PM

It has no filter thread.

However, 3rd-party filter holders may be an option. The thread below might provide some leads...

Pentax D FA 15-30mm filter system - PentaxForums.com

Steve

Paul the Sunman · 04-15-2021, 07:43 PM

Polarisers are problematic for ultra-wide lenses in any case. Your blue skies will look pretty weird because of the very different polarisations coming from different angles. Maybe this is an issue for variable ND filters as well; I haven't tried it.

Medex · 04-15-2021, 10:09 PM - **3 Likes**

If you want long exposure shot, you can use composite shooting mode instead of ND filter, e.g. 40 shots with short exposure (let's say 1/5 s)

Bertrand3000 · 04-16-2021, 02:03 AM

Originally posted by Medex

If you want long exposure shot, you can use composite shooting mode instead of ND filter, e.g. 40 shots with short exposure (let's say 1/5 s)

Interesting. Did you do that in camera? Was exposure correct (not divided by 40) for each shot and then averaged in the composite picture?

**stemked** · 04-18-2021, 08:34 AM

Fantastic all. Thanks Medex. I had taken and stacked multiple images before but never like that. What a cool idea!

Medex · 04-18-2021, 09:00 AM

Originally posted by Bertrand3000

Interesting. Did you do that in camera? Was exposure correct (not divided by 40) for each shot and then averaged in the composite picture?

There are different modes in composite menu. I used normal exposure.

04-15-2021, 05:37 PM	#1
stemked Site Supporter Join Date: Feb 2009 Location: Indianapolis Photos: Gallery \| Albums Posts: 527	Front element on the 15-30 f2.8 lens Hi all. I was looking at an image of the Pentax 15-30 f2.8 and it looks curved. Is that true? Is it possible to use filters on it? (ND, Polarizers) Thanks

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04-15-2021, 05:41 PM	#2
mattt Site Supporter Join Date: Feb 2011 Location: Niagara Photos: Gallery \| Albums Posts: 3,907	curved yes Need to use frame like WonderPana, Nisi, etc.

04-15-2021, 05:43 PM	#3
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,460	Originally posted by stemked Hi all. I was looking at an image of the Pentax 15-30 f2.8 and it looks curved. Is that true? Is it possible to use filters on it? (ND, Polarizers) Thanks Filters for Pentax 15-30mm lens - PentaxForums.com That should help.

04-15-2021, 05:44 PM	#4
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,172	The 15-30 does not have filter threads, however you can use filters with some sort of third party holder system. Such as this for 145mm round filters: WonderPana Filter Holder for Tamron 15-30mm SP F/2.8 Di VC USD (G1 & G ? Fotodiox, Inc. USA Or this for 150mm square filters: The LEE SW150 Mark II Filter System especially designed for a range of popular ultra-wideangle lenses. If you search the forums you should be able to find some older threads on that topic.

04-15-2021, 05:44 PM	#5
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	It has no filter thread. However, 3rd-party filter holders may be an option. The thread below might provide some leads... Pentax D FA 15-30mm filter system - PentaxForums.com Steve

04-15-2021, 07:43 PM	#6
Paul the Sunman Pentaxian Join Date: Aug 2011 Location: Melbourne Photos: Gallery Posts: 4,847	Polarisers are problematic for ultra-wide lenses in any case. Your blue skies will look pretty weird because of the very different polarisations coming from different angles. Maybe this is an issue for variable ND filters as well; I haven't tried it.

04-15-2021, 10:09 PM - 3 Likes	#7
Medex Pentaxian Join Date: May 2013 Location: Vilnius Posts: 1,021	If you want long exposure shot, you can use composite shooting mode instead of ND filter, e.g. 40 shots with short exposure (let's say 1/5 s)

04-16-2021, 02:03 AM	#8
Bertrand3000 Veteran Member Join Date: Feb 2019 Posts: 2,009	Originally posted by Medex If you want long exposure shot, you can use composite shooting mode instead of ND filter, e.g. 40 shots with short exposure (let's say 1/5 s) Interesting. Did you do that in camera? Was exposure correct (not divided by 40) for each shot and then averaged in the composite picture?

04-18-2021, 08:34 AM	#9
stemked Site Supporter Join Date: Feb 2009 Location: Indianapolis Photos: Gallery \| Albums Posts: 527 Original Poster	Fantastic all. Thanks Medex. I had taken and stacked multiple images before but never like that. What a cool idea!

04-18-2021, 09:00 AM	#10
Medex Pentaxian Join Date: May 2013 Location: Vilnius Posts: 1,021	Originally posted by Bertrand3000 Interesting. Did you do that in camera? Was exposure correct (not divided by 40) for each shot and then averaged in the composite picture? There are different modes in composite menu. I used normal exposure.