[southlander]

Thanks southlander for taking your time and explaining me the cons of the M 135mm f3.5. I really appreciated that. Definitely the purple fringing is to avoid and not desirable ... As you mention the chromatic aberrations, I am adjoining the original in order you can help me to see if there is in fact a CA (I may excuse with other users of this thread for continuing showing not a nice picture) ?? Cause I think the purple and green come from the original sand color and grass color of the out of focus backwards mountain and a color oversaturation I did ...

Thanks again for your advices,

The re-posted photo looks a lot cleaner. Nothing too obvious. I thought I saw some purplish colouring on the end grain detail towards the front of the fence post on the shot you first posted, but it looks like your post processing was the main contributor to what I thought I saw.

Many lenses can have a touch of purple fringing at wide apertures on high contrast edges. Good lenses get rid of it pretty quickly on the first click or two of stopping down. Modern lenses with automatic profile corrections of distortion and aberrations tend to hide it with the processing into JPEGs in camera or when uploaded to computer software. My M85/2 is a quality lens but can produce an amazing blue fringing outdoors at F2, heavily reduced by F2.8 and gone by F4. I really think F2 on that lens was designed for indoor portrait use only where lighting can be much more carefully controlled and high contrast edges avoided.

I don't have a really clear recent example of CA with the M135/3.5. The last lot of photos with it were generally pretty good (I must have been more careful with focus and background choice). If you look at this post on my blog A wet and rainy day and scroll to the pelicans with the jetty in the far distance, you can see some green CA around the jetty pylons (a close look and you can see I have used Lightroom to desaturate it to make it less obvious, with the side effect of producing an odd halo around the pylons). The top group of photos down to the bright orange seaweed were all with the M135/3.5 in interesting but rather low lighting levels on a late winter's afternoon.

The out of focus chromatic aberrations (CA) are more obvious with this shot taken with my M200/4 at either F4 of F5.6. I don't mind manual lenses but I do miss the EXIF details...



If you look at the out of focus parking zone signs behind the cupcake signage you should be able to see that the white/dark boundary around the sign is quite green fringed. The margins of the fluros upper left also show it as does the Colonel's chin. From memory the area out of focus but in front of the focus plane would show blue/purplish fringing. Not violently obvious and distracting here but out of focus trees with masses of bright/dark boundaries can get pretty ugly, so good to avoid.

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Last edited by southlander; 06-15-2014 at 04:38 AM.

[JibbaJab]

Contrasty magic (SOOC JPEG): M50/1.7

[Bunch]

SMC-M 50m f4 Macro reverse mounted on some cheap tubes.

[Jorgario]

Many lenses can have a touch of purple fringing at wide apertures on high contrast edges. Good lenses get rid of it pretty quickly on the first click or two of stopping down. Modern lenses with automatic profile corrections of distortion and aberrations tend to hide it with the processing into JPEGs in camera or when uploaded to computer software. My M85/2 is a quality lens but can produce an amazing blue fringing outdoors at F2, heavily reduced by F2.8 and gone by F4. I really think F2 on that lens was designed for indoor portrait use only where lighting can be much more carefully controlled and high contrast edges avoided.

Got it and remeber this for the rest of my life, not too open in high contrast ...

I don't have a really clear recent example of CA with the M135/3.5. The last lot of photos with it were generally pretty good (I must have been more careful with focus and background choice). If you look at this post on my blog A wet and rainy day and scroll to the pelicans with the jetty in the far distance, you can see some green CA around the jetty pylons (a close look and you can see I have used Lightroom to desaturate it to make it less obvious, with the side effect of producing an odd halo around the pylons). The top group of photos down to the bright orange seaweed were all with the M135/3.5 in interesting but rather low lighting levels on a late winter's afternoon.

Unfornutarely I could not saw the linked page ... but understood your idea to desaturate in PP (the contrary I did ...).

The out of focus chromatic aberrations (CA) are more obvious with this shot taken with my M200/4 at either F4 of F5.6. I don't mind manual lenses but I do miss the EXIF details...

Thanks for showing what CA exactly is and I also miss the EXIF info for M lens but I love the sensuality of doing everything manually on the lens ...,

[fuent104]

I don't have the results yet, but I took my ME Super (which was very graciously given to me by a forum member) out for a spin today with my M135 f3.5. It was a wonderful shooting experience, and I can't wait to have a full frame digital camera that replicates it.

[southlander]

Unfornutarely I could not saw the linked page ... but understood your idea to desaturate in PP (the contrary I did ...).

Thanks for showing what CA exactly is and I also miss the EXIF info for M lens but I love the sensuality of doing everything manually on the lens ...,

Link fixed. The http: part of the web address was duplicated. Should work now.

[paulh]

M50/2 on an *istD (xposted)

[paulh]

Took my old *istD and rarely-used M50/2 to the lake last night. The lens is a pretty decent performer, imo. I think this was f/8 (xposted):

[Dewman]

I have several older manual focus lenses left over from my film days, a SMC Pentax 50mm, f:1.4, a SMC Pentax 50mm, f:2 and a Takumar (bayonet) f: 2.5, 135mm among them. There's something about these lenses, their all-metal construction and solidness that commands respect. The optics in most of them is amazing.

[Jorgario]

You have inspired me, sir! I have several older manual focus lenses left over from my film days, a SMC Pentax 50mm, f:1.4, a SMC Pentax 50mm, f:2 and a Takumar (bayonet) f: 2.5, 135mm among them. There's something about these lenses, their all-metal construction and solidness that commands respect. The optics in most of them is amazing.

I really liked the third one,

[micromacro]

I received Pentax-M 100mm f4 from ebay seller today, in great condition. After playing with the lens for a while, I'm kind of disappointed. I get better macro and not only macro with Pentax-F 35-70mm, and I can great flowers pictures even better with Helios 44K-4 stopped down. Also, cheap Vivitar VMC 135mm f3.5 lens does not less job that M 100mm.
The lens is heavy and it's hard to focus in full length out handheld. It seems that lens is overrated somehow. Perhaps, I'm not got used to that lens yet.
Kind of feel sorry I paid $100 .

[baro-nite]

Kind of feel sorry I paid $100 .

That's a good price for that lens, if it is in good condition, so you should have no problem reselling it at cost. I have the Bellows Takumar version of this optic; I find it to be a fine performer (not stellar by macro standards but quite reasonable). It does need to be well stopped down (to at least f/8) for best performance.

[micromacro]

That's a good price for that lens, if it is in good condition, so you should have no problem reselling it at cost. It does need to be well stopped down (to at least f/8) for best performance.

It has been raining mostly all day, so I stopped down to 5.6 and f8 a few times. The condition is very good, and it came in original leather box, so I decided not to return the lens, but test more. If I'm not getting used into, then I return the money of course. The only advantage I found is no need to come too close to spiders and not to scary them

[micromacro]

I was wrong, Pentax-M 100mm is great lens. I did compare it today to Pentax-F 35-70mm. They both sharp, but 100mm is "rich". It's hard to explain, but it feels like that lens is higher grade. It also does great close up "portraits". Not gonna sell it any time soon
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Crop, very little pp:


Portrait of tiny lizard:

[cbope]

Very nice. I would be looking for one of these if I didn't already have my F 50 macro.