Ricoh Rikenon 55/1.4 (M42)

Pixel-8 · 03-14-2016, 03:17 PM

Steve. By LaCA I assume you mean lateral chromatic aberration. I see that too, in the doorknob photo there is purple green shift (purple to the right, green to the left).

https://photographylife.com/what-is-chromatic-aberration

I also see LoCA in the skateboard photo to the left of the board, and in the doorknob photo. So both are evident in that photo. Mostly I get LoCA with my copy, but occasionally I get both too. Not a huge issue but does occur wide open to around f3.5.

In any case I see it in both the doorknob photo and also in the skateboard photo. Not really that bad compared to some other lenses but still there nonetheless. I have the same thing with my copy which is a Sears branded version of the same exact lens.

I use the lens stopped down alot (@f4.0-5.6) and it goes away.

For wide open shots with this lens I prefer B&W conversions.

Piotrek K · 02-25-2017, 03:02 PM

One image which maybe can show some IQ flaws wide open (for more knowledgeable):

...and two shwing quality in night shots at infinity and wide open:

stevebrot · 04-23-2019, 10:19 PM - **1 Like**

Here are a couple of examples showing bokeh quality with the Auto Rikenon 55mm f/1.4.

Purple Penstemon

Unknown aperture, Pentax K-3

A Darker Vision Still

Pentax K-3, f/1.4 with intentional desaturation in post

Foxglove In Fuschia

Pentax K-3, unknown aperture

Steve

04-23-2019, 10:19 PM - 1 Like	#33
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Here are a couple of examples showing bokeh quality with the Auto Rikenon 55mm f/1.4. Purple Penstemon Unknown aperture, Pentax K-3 A Darker Vision Still Pentax K-3, f/1.4 with intentional desaturation in post Foxglove In Fuschia Pentax K-3, unknown aperture Steve Last edited by stevebrot; 04-23-2019 at 10:38 PM.

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03-14-2016, 03:17 PM	#31
Pixel-8 Senior Member Join Date: Jan 2014 Posts: 265	Steve. By LaCA I assume you mean lateral chromatic aberration. I see that too, in the doorknob photo there is purple green shift (purple to the right, green to the left). https://photographylife.com/what-is-chromatic-aberration I also see LoCA in the skateboard photo to the left of the board, and in the doorknob photo. So both are evident in that photo. Mostly I get LoCA with my copy, but occasionally I get both too. Not a huge issue but does occur wide open to around f3.5. In any case I see it in both the doorknob photo and also in the skateboard photo. Not really that bad compared to some other lenses but still there nonetheless. I have the same thing with my copy which is a Sears branded version of the same exact lens. I use the lens stopped down alot (@f4.0-5.6) and it goes away. For wide open shots with this lens I prefer B&W conversions.

02-25-2017, 03:02 PM	#32
Piotrek K Pentaxian Join Date: Dec 2012 Photos: Gallery Posts: 1,384 Original Poster	One image which maybe can show some IQ flaws wide open (for more knowledgeable): ...and two shwing quality in night shots at infinity and wide open: