Which 25mm 645 Lens

2351HD · 08-25-2013, 01:24 PM

Hi all,

Just reading about the 25mm DA and DFA models.

Is there any significant image quality difference between the two?

I would like to mount a custom lee filter holder over it for at least 1 grad, so I am guessing that the DFA would be better due to the shorter hood.

Any advice would be great.

Scott

Adam · 08-25-2013, 01:26 PM

They're the same lenses except for how the hood is designed. I don't think the DFA version is available new any more.

**seventhdr** · 08-25-2013, 02:49 PM

Originally posted by 2351HD

Hi all,

Just reading about the 25mm DA and DFA models.

Is there any significant image quality difference between the two?

I would like to mount a custom lee filter holder over it for at least 1 grad, so I am guessing that the DFA would be better due to the shorter hood.

Any advice would be great.

Scott

The DFA version has a shorter hood and can be used on the Pentax 645 film cameras without any vignetting.

The DA version has a longer hood which will cause some vignetting on Pentax 645 film cameras.

They both have the same optical formula but I have also seen it reported that the DA version has different lens costings which make it a better performer on the 645D with digital sensor.

Regards

Chris

**Ed Hurst** · 08-26-2013, 04:28 AM

I have yet to see any clear evidence on whether the two versions actually have the same optical formula... Different views pop up quite often on this, but nothing definitive that I have seen...

08-25-2013, 01:24 PM	#1
2351HD Veteran Member Join Date: Apr 2013 Location: Brisbane, Australia Photos: Albums Posts: 750	Which 25mm 645 Lens Hi all, Just reading about the 25mm DA and DFA models. Is there any significant image quality difference between the two? I would like to mount a custom lee filter holder over it for at least 1 grad, so I am guessing that the DFA would be better due to the shorter hood. Any advice would be great. Scott

08-25-2013, 01:26 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	They're the same lenses except for how the hood is designed. I don't think the DFA version is available new any more. 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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08-25-2013, 02:49 PM	#3
seventhdr Site Supporter Join Date: Mar 2007 Location: Christchurch, New Zealand Photos: Gallery Posts: 1,440	Originally posted by 2351HD Hi all, Just reading about the 25mm DA and DFA models. Is there any significant image quality difference between the two? I would like to mount a custom lee filter holder over it for at least 1 grad, so I am guessing that the DFA would be better due to the shorter hood. Any advice would be great. Scott The DFA version has a shorter hood and can be used on the Pentax 645 film cameras without any vignetting. The DA version has a longer hood which will cause some vignetting on Pentax 645 film cameras. They both have the same optical formula but I have also seen it reported that the DA version has different lens costings which make it a better performer on the 645D with digital sensor. Regards Chris

08-26-2013, 04:28 AM	#4
Ed Hurst Site Supporter Join Date: May 2010 Location: Sydney Posts: 1,657	I have yet to see any clear evidence on whether the two versions actually have the same optical formula... Different views pop up quite often on this, but nothing definitive that I have seen...