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12-07-2014, 06:43 AM   #1
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645D Lens Question

Is there a Difference in the Newer lenses for the 645D ? Ex. FA lenses and DFA lenses ? Are they one and the same? Thank you


Last edited by rollsman4; 12-07-2014 at 08:37 AM.
12-07-2014, 08:47 AM   #2
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All of the FA lenses are older and designed for film, though most are excellent on the 645D. The only D FA lens is the 25mm, which is a new lens that was sold in markets other than the US when the lens was first released. It's designed for full frame and has a built in lens hood that is designed for that. The DA 25mm is available in the US, though I've heard it's being discontinued, at least temporarily. It is designed for a cropped sensor (like the 645D and Z) and has a lens hood designed for that. Also, these newer lenses don't have aperture rings, unlike the older FA. The DAs are also designed for digital, which means higher design standards. Other DA lenses include the 55mm, 90mm and 28-45mm zoom. Hope this helps!

---------- Post added 12-07-14 at 09:51 AM ----------

Also, I've heard some of the "older" FA lenses are being put back into production by Pentax, so though the designs are old the lenses may be new. Personally I'd save the money and buy used.
12-07-2014, 09:27 AM   #3
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The 25, 55, 90 and 28-45 are all newer, so may have better coatings, and are all weather sealed. The older fa lenses lack weather sealing, are much cheaper, but are still fine lenses.

The even older 'a' series are good, as a stop gap on digital, but you'd probably want to upgrade them sooner rather than later for the 645d/645z (unless it's a focal length you only need once in a while). They're great on film though...
12-07-2014, 12:39 PM   #4
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I appreciate explaining the difference. It makes sense to me. I will buy only FA lenses for my 645D Thank you again,

12-07-2014, 04:52 PM   #5
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Having used A and Fa lenses of the same focal length, I am unable to tell the difference at landscape aperture on the 645z

The fa zooms are easier to work with for filters as the front barrel does not rotate when focusing...
12-07-2014, 07:01 PM   #6
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The 645 35mm A is my favorite landscape lens...very sharp and has a pleasant star burst when pointed at the sun.
12-08-2014, 06:55 AM   #7
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QuoteOriginally posted by gha128 Quote
Having used A and Fa lenses of the same focal length, I am unable to tell the difference at landscape aperture on the 645z
That's quite an endorsement for the older A series. Of course some share the same optical formula with the FA equivalent. Have you compared the 200s? I've been contemplating those, and they have different formulae.
12-09-2014, 01:37 AM   #8
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I haven't compared that lens (I have an FA version) but it's worth remembering that the 645z is a crop sensor when using legacy glass. At F8 and using the sweet spot of the lens you'd have to be rather more interested in the finer nuances of pixels than actually getting out there and photographing!!!

And in the end it's the print that matters. Most viewers would never know or care what camera was used or what lens!

My thoughts: Guy Aubertin Photography | Review of the Pentax 645z from a landscape photographer - Guy Aubertin Photography

12-09-2014, 04:47 AM   #9
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when the 645d came out we only had the older lenses, and we were getting excellent results.
12-09-2014, 06:27 AM   #10
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QuoteOriginally posted by gha128 Quote
I haven't compared that lens (I have an FA version) but it's worth remembering that the 645z is a crop sensor when using legacy glass. At F8 and using the sweet spot of the lens you'd have to be rather more interested in the finer nuances of pixels than actually getting out there and photographing!!!

And in the end it's the print that matters. Most viewers would never know or care what camera was used or what lens!

My thoughts: Guy Aubertin Photography | Review of the Pentax 645z from a landscape photographer - Guy Aubertin Photography
I enjoyed re-reading your article, which I had seen before. As you say it's all about the print. For smaller prints it doesn't matter, and indeed there's not much point lugging around MF gear to make small prints. (Why, then, have I started lugging around MF gear? Good question.) For large prints one does want the detail. Pentax does slip up sometimes -- the 45/2.8 is pretty widely regarded as unsharp at any aperture. So I'm curious if the FA 200 is any sharper than the A version. Or, for that matter, if the later 67 200 is better still -- it gets high praise in the lens reviews here.

QuoteOriginally posted by bull drinkwater Quote
when the 645d came out we only had the older lenses, and we were getting excellent results.
True indeed. I'm not talking about the new lenses, though, just the A and FA series.
12-09-2014, 08:29 AM   #11
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There have been very mixed results with both 200mm lenses. I have produced both mush and Leica-matching quality of the FA 200mm (I literally did a side-by-side shot with an S2 with a 180mm mounted, and the 645d was slighty better because the S front-focused a touch. The print is 30x40 and hangs in my office.

The A-200mm I tried I could not get good results with. Not sure why. I MUCH prefer the feel of the older A-series lenses, with their longer, helicoid focus throw, but manual focus is not the easiest thing with the digital 645s.
12-09-2014, 09:28 AM   #12
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I've had good results with my A-200mm, but it is difficult to focus as the DOF is very thin and infinity focus isn't exactly at infinity (due to how telephoto lenses are constructed to work in varying temperatures from what I've read).
12-09-2014, 09:29 AM   #13
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Thanks all. I'll probably try the A, as they can be picked up so cheaply.
12-10-2014, 09:51 AM   #14
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instead of the 200 you could go FA150 and then up to 300, possibly use a 1.4x TC on the 150 to fill the gap if needed.
12-10-2014, 11:05 AM   #15
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Thanks Mike. I already have the A150/3.5, just looking for something a bit longer. The 1.4x on the 150 would certainly do that. Not to mention, the FA150 is about twice the cost of the FA200.
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