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06-03-2009, 06:39 PM   #1
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FA43/1.9 vs. K55/1.8--which is which?

Curious to see how the 43 and 55 stack up in terms of sharpness and color, I pitted them against each other. These were both taken at f/8, .8 sec @ 400ISO; the camera was mounted on a tripod with a shutter cable used to trip the shutter. Both are cropped to approximately the same field of view. Both lenses were naked--no filters or hoods. While I won't say which one is which right now--I want you to try and figure it out...





06-03-2009, 07:22 PM   #2
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What are those things you photographed? They don't look like an iPod!?!
06-03-2009, 08:09 PM   #3
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Heather,


At f/8, a lot of lenses are going to look pretty similar - I'd be interested in seeing how both compare wide open, though!


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06-03-2009, 08:26 PM   #4
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I peeked! The results don't really surprise me however.

Steve

06-03-2009, 09:17 PM   #5
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Heather,
Since you are using a tripod you could have used ISO100 which will show more detail. ISO400 is not going to reveal much about lens resolution as there is fair amount of noise.
At f/8 you might as well compare it against the kit lens, you will not see much difference either.

The exposure time looks different on both photos which makes the colors of the fist photo washed and lacking contrast.
Also the top photo looks like it's out of focus, and the white balance is different on both.
In short, too many variables and too many things are done wrong for a just comparision.

Cheers,

Last edited by Voe; 06-03-2009 at 10:02 PM.
06-03-2009, 09:48 PM   #6
and
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As other have said, comparing lenses at f8 is not very usefull, if f8 was all I was going to use I would just use the kit lens and save money.
06-03-2009, 10:22 PM   #7
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QuoteOriginally posted by stevebrot Quote
I peeked! The results don't really surprise me however.

Steve
*Ditto*

Regards,
Mike
06-03-2009, 10:42 PM   #8
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I peeked too.....Hmm...I have a big financial question to ask once the secret is out.

06-04-2009, 12:09 AM   #9
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I would prefer to see wide open and ISO 100, not much point at this length and ISO... also agree on white balance and focusing
06-04-2009, 07:16 AM   #10
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Original Poster
I'm absolutely serious when I say that both pics were taken at the same aperture and shutter speed and were focused properly. The reason I chose f/8 is that it's an aperture that I tend to use a lot. With that being said, however, I'll definitely try it again wide open at ISO 100 and see what I get.

For any of you who haven't figured it out yet--the first shot was taken with the FA43 and the second one was taken with the K55.

If I were to do further comparisons with both lenses and get similar results, I'm wondering why I should hang on to the FA43 when the K55 will do just as good or better job as the low-light lens. I don't use it all that often, anyhow and I'm thinking about taking another stab at learning how to use an ultra-wide agle lens for my landscape work.

Heather
06-04-2009, 07:22 AM   #11
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yea, for the 55♠ I say keep the 43 for film, I see you have a film body so I assume you use it. the 43 is of course just about the perfect lens for 24x36mm.
06-04-2009, 09:47 AM   #12
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At this close subject range, it seems the 55 would be the best choice since it is truly a flat macro lens... Like the others I would like to see some ISO 100 wide open shots of varing subject distances to see the OOF area and how the lenses handle the In focus / out of focus transitions.

I have always longed for the FA 43... But I have so many faster 55's that I have not really fell HOH for the DA 55 yet... You could get me heading in that direction with the right series of test shots. haha
06-04-2009, 10:51 AM   #13
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QuoteOriginally posted by Igilligan Quote

At this close subject range, it seems the 55 would be the best choice since it is truly a flat macro lens...
Gus,
I think her lens is the Pentax-K 55/1.8 (mid-70s manual focus). A fine lens, but not the new DA 55/1.4. (Neither lens is a dedicated macro.)

Steve
06-04-2009, 11:01 AM   #14
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QuoteOriginally posted by hwblanks Quote
If I were to do further comparisons with both lenses and get similar results, I'm wondering why I should hang on to the FA43 when the K55 will do just as good or better job as the low-light lens. I don't use it all that often, anyhow and I'm thinking about taking another stab at learning how to use an ultra-wide agle lens for my landscape work
really not very surprised when the subject is like that, you expect the surprise :P
the reason to keep is the obvious, focal length, autofocus, proper autoexposure. i really like 43mm on film and digital, but 55 i probably wouldn't like as much
06-04-2009, 12:47 PM   #15
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Thanks Steve

QuoteOriginally posted by stevebrot Quote
Gus,
I think her lens is the Pentax-K 55/1.8 (mid-70s manual focus). A fine lens, but not the new DA 55/1.4. (Neither lens is a dedicated macro.)

Steve
Duh... it pays to actually read the original post! It was early and the coffee had not kicked in! That is the only explanation....

Well I already have a 55 1.8 tak so I guess I am good... except not having the FA 43
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