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07-10-2010, 03:36 AM   #1
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645D and FA645 lenses

Now that the camera is out have anyone tried the 645D with various FA lenses? how do they perform?
I am especially thinking of the FA645 33-55/4.5, FA 75/2.8, FA 120/4 Macro and the FA 150-300/5.6 since I own them

02-17-2011, 11:04 AM   #2
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The 75/2.8 - excellent, sharp right into the corners at f5.6 and above
120/4 macro - same, from f4 onwards

I don't own the others.

Later.
Other lenses I own or have tried on the 645D (comments refer to apertures between f5.6 and f11, not wide open) -
35m FA - sharp but not stellar
55mm A - as the 35
45-85 A - very sharp at all focal lengths; a little corner CA at 75-85
135mm LS - extremely sharp right into the corners
200mm A - ditto
400mm FA - ditto
1.4X extender - usable on 200 and 400 but noticeable CA round edges and corners

Last edited by dgpaterson2000; 02-18-2011 at 04:01 AM. Reason: Afterthought
02-17-2011, 12:00 PM   #3
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200mm - Very sharp performs great

150 f2.8 - My version is pretty sharp, its not as sharp as the 200mm wide open but still great. I love this lens for outdoor portraits wide open.

120mm macro - awesome lens, my copy is very sharp even at f4. This is my go to lens for indoor portraits.

45-85mm - Mixed reviews on this lens here. My copy looks great and the corners are only slightly softer. Some people have found that one corner is good while the other is soft...maybe age or just a bad copy. This lens will be a roll of the dice if you buy it used.

80-160mm - great from 80 to about 150, it gets a little soft at 160, but still usable.
02-23-2011, 10:37 AM   #4
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QuoteOriginally posted by Pål Jensen Quote
Now that the camera is out have anyone tried the 645D with various FA lenses? how do they perform?
I am especially thinking of the FA645 33-55/4.5, FA 75/2.8, FA 120/4 Macro and the FA 150-300/5.6 since I own them
33-55 is no good at 645D. rather weak corners.

02-23-2011, 01:52 PM   #5
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QuoteOriginally posted by Shuttershane Quote
200mm - Very sharp performs great

150 f2.8 - My version is pretty sharp, its not as sharp as the 200mm wide open but still great. I love this lens for outdoor portraits wide open.

120mm macro - awesome lens, my copy is very sharp even at f4. This is my go to lens for indoor portraits.

45-85mm - Mixed reviews on this lens here. My copy looks great and the corners are only slightly softer. Some people have found that one corner is good while the other is soft...maybe age or just a bad copy. This lens will be a roll of the dice if you buy it used.

80-160mm - great from 80 to about 150, it gets a little soft at 160, but still usable.
Hi All

I've been testing out most of the Pentax FA single focal length lenses on the 645D and once complete will post my thoughts. The one lens out of all of them that has my stymied is the FA 200 f4. Most say its very good to excellent on the 645D but thats the one lens where my findings on a number of samples doesn't hold up. First let me say that I am looking a 100% crops, since these are a good indicator of how it will print very large.

At f4 the crops looks quite awful, At f5.6, its slightly better but still very subpar across the frame. At f6.7 it starts to become passable and at f8, it is the first really useable f-stop for large format prints...also judging by the 100% crops. Yet even at f11, it still isn't up to the performance of say the FA75mm f2.8 or of course the exceptional FA 120 f4 macro.

What I'd love to see is a series of 100% crops (center for now would be fine) of this lens (the FA 200 f4) on a 645 D at f4 thru f11, to see if the samples I tested just by chance were an anomoly or the norm.

On a seperate note I should say both hi to everyone, since this is my first post on these forums, although I've been shooting Penatx professionally for over 3 decades I recognize a few names here such as Pal...from the Pentax discuss group days (I was Zx5Lx)..and my fingerprints regarding postings there on some of my lens testing can be found in their archives. I also know Steven here who has posted many of his experiences with lenses on the 645D...and I concur with his observations.

In any case, those who have specifically used the FA 200 f4 lens on their 645D and examined 100% crops at most f-stops...I would look forward to your findings...especially as it say relates to a few other of the single focal length FA telephotos.

Thanks everyone.

Dave (DandA)
02-23-2011, 04:57 PM   #6
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I have been getting reacquainted with my A*600mm f/5.6 ED[if] and 1.4X rear converter on a 645NII. Results on T-Max 100 and Fuji velvia are certainly promising examining transparencies and negatives under a 10X schneider 35mm loupe- No visible aberrations, vignetting is non-existent, and resolution should be more than adequate for the 645D, though for those who prefer lens focal length to be reported in the exif the A*600mm f/5.6 ED doesn't have that ability.

It would be nice if Pentax came out with more super telephoto lenses for the 645 system,An because pentax has a long history for being the only manufacturer that had anything beyond 500mm f/8 mirror lenses that tended to produce eye-gouging bokeh.
02-23-2011, 06:03 PM   #7
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QuoteOriginally posted by DandA Quote
Hi All


What I'd love to see is a series of 100% crops (center for now would be fine) of this lens (the FA 200 f4) on a 645 D at f4 thru f11, to see if the samples I tested just by chance were an anomoly or the norm.
telephotos.

Thanks everyone.

Dave (DandA)
Hi Dave:

I've tested the A and FA versions of this lens. The FA is very good, not quite the as good as the 120.
Here are some samples: full scene and center crops aat f/4 and f/8. The lens improves by stopping down

Tom
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02-23-2011, 09:30 PM   #8
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Hi Thomas,

Thanks ever so much for posting these crops, truly appreciated! It's hard to say from looking at just one relatively small crop at f4, but it looks like your FA 200 f4 at f4 is better than the others I've tested and examined. It's at f4 and f5.6 (relative to at least f8 or f11, that will tell me if the ones I tested are the norm or not.

Hoping some other 100% crops of the Fa 200 on the 645D can be posted taken at f4/f5.6 and then f9 (approx.).

Many thanks again Thomas!

Dave (DandA)

02-24-2011, 05:11 AM   #9
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Dave:
I have found the A and FA versions to be quite good and both improve noticeably upon stopping down, even at f/5.6. I wonder if your difficulty is a focus issue. Here are two crops with the A lens at f/4 (same overall scene). One is focused using the Pentax 2x magnifer to aid manual focus the other without the 2x.
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02-24-2011, 07:24 AM   #10
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Hi Thomas,

Once again thanks for posting these comparitive images. I wish I could say it was due to a focusing error but unfortunately it wasn't. Not only did I borrrow a pentax magnifier and shoot the FA 200's in MF repeatedly (to eliminate possibilty of focus errors, but also meticulously fine tuned the 645D Af (for any possible front/back focus. Interestingly, your shot on the left at f4 which is very soft/blured due to focusing error, is how virtually all the samples of the FA 200 looked when properly focused at f4 and even close to that at f5.6. Tht image alone (the one on the left) illustrates my results. I would have expected something closer to to your image on the right side, which looks excellent for a crop at f4 (which is only going to improve upon stoping down). Thanks again for posting these. Hopefully others may have 100% crops with their FA 200 on the 645D at f4 and f5.6 to post.

Dave (DandA)

Last edited by DandA; 02-24-2011 at 12:30 PM.
03-07-2011, 05:10 PM   #11
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Has anyone posted the results of the A version 35mm, as it differs from the FA version? Probably, but I cannot recollect any.

Thanks for posting the 55mm comparisons, very useful to know.

Has it been confirmed, btw, that the FA and A 75mm share the same optics? I now have both, but still need to test them thoroughly. Will probably (need to) release one of them, but it's a hard choice if identical in optics: the A feels more solidly built, the FA has autofocus and passes on EXIF. I already sold the LS version, which is as good as the A although I did not test it as thoroughly as those tests in this forum, not at all. But intuition often tells you instantly which lens is good and I think the 75mms are a triplet.
03-07-2011, 07:25 PM   #12
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The FA and A 75mm are 6 elements in five groups.
03-07-2011, 07:29 PM   #13
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I know, doesn't mean they are the same, or does it? The FA version is lighter. I also find it hunts more often than my 45-85mm, or 150mm.
03-09-2011, 09:01 AM   #14
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QuoteOriginally posted by Shuttershane Quote
200mm - Very sharp performs great

150 f2.8 - My version is pretty sharp, its not as sharp as the 200mm wide open but still great. I love this lens for outdoor portraits wide open.

120mm macro - awesome lens, my copy is very sharp even at f4. This is my go to lens for indoor portraits.

45-85mm - Mixed reviews on this lens here. My copy looks great and the corners are only slightly softer. Some people have found that one corner is good while the other is soft...maybe age or just a bad copy. This lens will be a roll of the dice if you buy it used.

80-160mm - great from 80 to about 150, it gets a little soft at 160, but still usable.
Appreciative of comments but can you clarify whether or not these are the A of FA versions that you are using or combination thereof?

Stephen
03-11-2011, 09:29 AM   #15
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The 150mm must be the FA version (A is 3.5).
The 120mm and 45-85mm have exactly the same optics in A and FA versions.
I believe that also applies to the 80-160 but there I'm not so sure.
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