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Forum: Pentax SLR Lens Discussion 12-15-2020, 11:15 PM  
An other telelens comparison : Pentax vs. Takumar vs. Tamron
Posted By CarbonR
Replies: 7
Views: 728
I'll use a better way (to my opinion) : a sort of ruler at 45. No need to compare front and rear caps, juste to see where the focus is ;)



This is what I always do but with a thin DOF and some lenses having not extremely precise focusing ring, this is tricky to achieve the right focus, especially in lieview x10 on a 300-400mm.

I will do an other test because I want to see how the Tamron handles with a 2X converter.
Forum: Pentax SLR Lens Discussion 12-15-2020, 01:59 PM  
An other telelens comparison : Pentax vs. Takumar vs. Tamron
Posted By CarbonR
Replies: 7
Views: 728


I was not exactly expecting this :
- Tamron is better than I had in mind (I had one in the past)... but to focus with it is like sitting on a cactus, the focusing ring is too much reactive.
- The Takumar 400/4 is better than the 500/4.5, this does meet my feeling.... but I was waiting is at a better general level.
- I am still having trouble to do a 100% good focus, I need to develop something to do it more acurately.
Forum: Pentax SLR Lens Discussion 12-14-2020, 02:27 PM  
UWA : Irix vs. Samyang vs. Takumar
Posted By CarbonR
Replies: 7
Views: 595
It is on the list of the lenses that are out of the budget I wanted to spent in a UWA toy :lol: Or, to be exact : on one toy. The two Irix cost more, but they can do more things that the Laowa 12/2.8 would have been capable. I am not sure that the 11mm is actually usable for me, 12mm only could be too wide, it would have been too risky to take only the 12mm.




I did not test all Irix. Mine seem to be good. I should have the 15/2.4 returned to seeler bcause the hood is not correctly aligned and the chip says 11mm f/4 lens (but f/2.4 if used at f/2.4), but I may try to only change the hood to be sure to keep my good lens.
Forum: Pentax SLR Lens Discussion 12-13-2020, 02:35 PM  
UWA : Irix vs. Samyang vs. Takumar
Posted By CarbonR
Replies: 7
Views: 595
First tests with all these lenses :



(no focus error for the Takumar : it was dirty in liveview too)



Considering these results (that confirm previous tests of Samyang vs. Takumar), I would say that if you are searching for the :
- best compromise all included and cheapest lens : Samyang 14/2.8
- best 14-15mm : Irix 15/2.4 (more constant than Samyang)
- best with unlimited budget : Irix 11 (widest) + 15 (brighter, filters)
- widest lens : Irix 11/4 validated for me
- best on Spotmatic : Takumar 15/3.5 (only lens available on M42)
- UWA with filter thread : Irix 15/2.4 (95mm filters)
- best construction quality : Takumar >> Samyang >> Irix (full metal >> plastic with smooth focusing ring >> all plastic with "plastic feeling/no feeling" focusing ring)

Note on Irix 11/4 : of course we can have better lens... but my specification sheet was to have the widest rectilinear lens in M42/K/EF mount for lets say, under 700 EUR.
The distorsion of the Laowa 15/4 is a no-go for me (if I have to process each picture, I can also take a fish-eye lens...)
The Laowa 12/2.8 zero-D is too expensive
Canon lenses are too expensive
Samyang XP lenses (10/3.5 and 14/2.4) are too expensive
Forum: Pentax SLR Lens Discussion 12-09-2020, 02:24 PM  
Irix lenses - first impressions
Posted By CarbonR
Replies: 10
Views: 840
I have the opposite feeling. The focusing ring of the Samyang (and I also have the 24/1.4 and 35/1.4, the 14/2.8 is not my only Samyang), aloutgh being less good than a Takumar, is very acceptable, while the two Irix feel like if everything was in plastic with a poor grease.




I got a black friday offer and paid 410 EUR for the 15/2.4. Used lenses in France were at almost the same price so I went for new lens. I would say that 400-500 bucks is not a low price, but is a cheap price, at least for my 6D. The only cheaper solution is the Samyang 14/2.8 (I paid my used one at a good price, 150 EUR), but it does not accept filter like the Irix, this is why I wanted to test the Irix. I bought a ND32000 filter for it (yes, 15 stops reduction, I will be able to expose for minutes in sunny day :lol:)




No adjustment... first time I heard this as a real cons. I never had to adjust any lens. And the Irix have a "clic" at infinity that can be adjusted with a screwdriver, and I already partially disassembled my Samyang 35/1.4 to repair the aperture system that failed after dropping both lens and camera on the ground ! ;)

I also have the Samyang 14/2.8, but as said above, I wanted to test the possibility of an ultra wide angle lens that accept filters. No internet-test (especially when shooting charts) can replace me using the lens on field t see if it can meet my requirements. I am more exploring that being 100% sure of what I want. Other lenses that interested me :

- Samyang 10/3.5 but 2.5 times more expensive than the Irix
- Samyang 20/1.8, but 20mm, what a teleobjective compared to a 15mm
- Laowa 15/4 shift+macro, but more expensive and if I remember correctly, strong distorsion
- An other expensive Laowa lens (12.28 zero D ?)
Forum: Pentax SLR Lens Discussion 12-08-2020, 01:38 PM  
Irix lenses - first impressions
Posted By CarbonR
Replies: 10
Views: 840
My first feelings about the Irix firefly lenses (11/4 and 15/2.4, received today) :
- Clic at infinity on the focusing ring is a good idea
- Feeling of focus ring is horrible compared to Takumar and clearly behind Samyangs. Not unusable, but nothing silk smooth. OK for UWA lenses, we do not use focus ring a lot. It may be better on blackstone versions.
- The bag is not very practical and will not protect against anything rough.
- Filter thread of the 15/2.4 would be better 1-2mm away. I have the feeling of scratching the front lens when screwing a filter.
- Metal box looks good, but only at unboxing. I am not sure of its utility out of unboxing pleasure. I would have prefered a rigid case instead of the metal box.

To summarize, it is not top quality finish when compared to Samyangs (which are far beyond Takumars). If you only look for the functionnality of the lenses (like I was for a 11mm lens or 15mm lens with filter thread), they will be enough, otherwise if you love beautiful items, go for blackstone versions.

To better see what a 11mm lens is capable, three photos at the same point of view, drivers seat set at a normal position :

(shots on Canon 6D, as I went to Canon 10 years ago for FF)


24mm is a good telephoto lens !

Of course, there will be a comprison between Takumar 15/3.5, Samyang 14/2.8 and Irix 15/2.4 ;)
Forum: Pentax SLR Lens Discussion 12-07-2020, 12:58 PM  
12x 135-150mm lenses compared including almost all Takumar
Posted By CarbonR
Replies: 6
Views: 610
Fun fact : I did not take the time to search for a such tool, but said to me that roughly a x10 on prices would not be so far from reality :lol: This is not decorrelated to actual prices... but now we have Af lenses !
Forum: Pentax SLR Lens Discussion 12-06-2020, 10:57 PM  
12x 135-150mm lenses compared including almost all Takumar
Posted By CarbonR
Replies: 6
Views: 610
I see at list some factors for this phenomenon I agree with :
- Zooms are more common now and far better than decades ago, so we less need primes for general work. There is now many zooms between 70-200/300mm range, while they were not common 50 years ago. Nowadays we do not have many fixed lenses between 85mm (excluded) and 300mm (excluded), macro lenses excluded, like if they were all replaced by 70-200 or 70-300 zooms.
- 135mm is a bit long for portraiture, a bit short pour wildlife and sports in large areas, but in 1971, a S-M-C Takumar 135/3.5 was 67 worth, while a 85/1.9 was 99.99 (same price for the 200/4) and a 105/2.8 was 79.99 (be careful when analysing this, these prices have almost 50 years). Is also is the cheapest solution for portraiture without the standard 55-58mm lens or even for a telephoto lens, especially with many "noname" lenses available. Today we have many options like Samyang's or second hand market of old lenses to have cheap portrait lenses, or even for telephoto.
Forum: Pentax SLR Lens Discussion 12-06-2020, 10:46 AM  
12x 135-150mm lenses compared including almost all Takumar
Posted By CarbonR
Replies: 6
Views: 610
I always considered it (V2) as a good lens, and this test confirmed it ;)
Forum: Pentax SLR Lens Discussion 12-06-2020, 03:42 AM  
Some 200mm lenses compared
Posted By CarbonR
Replies: 5
Views: 605
The caps are indeed better for that, but for my test I wanted to have something closer to my real usage of the lens. After all, what I want for a lens is to perform well when I use it, I do not really care about lines per mm or chromatic aberations if the lens allows me to do what I want. Of course this way to test is less discriminating the lenses that are close to each others. The plush toy is a good candidate for that : it has a rather close look to human skin with small details, has colors (OK, more saturated than a human), hair, close dimensions to a human face, it is in 3D as a human,etc. And unlike a human, it is completely static provided there is not too much wind :D
Forum: Pentax SLR Lens Discussion 12-06-2020, 02:49 AM  
12x 135-150mm lenses compared including almost all Takumar
Posted By CarbonR
Replies: 6
Views: 610
Here are all the ~135mm lenses I had for testing :



135/3.5 Takumar are all equivalent (M37 version does not reach infinity due to the adapter)
Confirmation : there is a real difference among the two 135/2.5, and the V2 is clearly good !
The Sigma is a good surprise, I knew it was not extremely good at full aperture but I did not expect it to be as good as the 135/2.5 V2 when stopped down (at least in center)
The small 150/4 are very good
Zooms are quite good, especially the 45~125
The 150/2.8 is quite deceiving, and makes me a reddish spot in center
Forum: Pentax SLR Lens Discussion 12-06-2020, 02:46 AM  
Some 200mm lenses compared
Posted By CarbonR
Replies: 5
Views: 605
Here are some 200mm lenses I had :



Good surprise of the Soligor 200/3.5, I was not expecting such sharpness/bokeh combo from a "noname" lens
Other lenses do weel in this comparison, Sadly I had aperture problems with the 200/2.5 during the test...
Forum: Pentax SLR Lens Discussion 12-02-2020, 02:36 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
No problems for the slightly off. Every experience and way to do is interesting to share. I am not here to say "my method is the only one that is valid, you should do like this". Everyone has its own wills, objectives and motivation to do photography (or any other occupation) and we do not all take pleasure on the same way, so there cannot be only one good method. Some like MF lenses, some like AF lenses... but all of them are happy with their technique.
Forum: Pentax SLR Lens Discussion 12-01-2020, 02:59 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
I almost never use it because do not have anything interesting for my use : I have sharper, brighter, better bokeh lenses, and I do not shood candind or other situation where a pancake lens would be interesting. I keep it with the Zenit for purely sentimental reason (my first film SLR).




Yes, context is always interesting. The first person for whom I did these tests is me, to be sure of what lenses to keep and what lenses to sell (I do not want anymore to keep lenses that will rest on a shelf for ever), so I shooted like I shoot regularly, apart from the tripod to keep the same picture during tests.




I have their original lens hood (apart for the Industar and its not standard diameter), I also have a bunch of generic lens hoods in different diameters... but never use them (or sometimes with lenses known to lack of contrast, or when the lens hood is integrated to the lens so used without hassle). A lens hood is for me more like a bumper to protect my lens if this is a dangerous situation, or for astrophotography it is said to be a good fog repeller. I consider that I do not pay expensive lenses with "multi-nano-mega-coating" to keep using lens hoods like in the early 1900 with bare glass without coating. If I ever lack a bit of contrast for a picture, I can add some in Toshop/Gimp or for film, by changing the grade. Contrast is not exactly a missing information like an unsharp image, or bad bokeh in the background, that you cannot correct at processing (either film or digital), so that why for my usage I prefer the bare lens, because it is simplier for me (no time to screw a lens hood and unscrew it, no place taken in the bag).
Forum: Pentax SLR Lens Discussion 12-01-2020, 01:54 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
Yes, if I use your link, I go to the site, while my link make me go to the direct image. And on the site I do not see any ad ;)



My Industar, alongside with the Zenit E it came with (this was my first film SLR and I did some rolls with it), has his serial starting by 80 so I assume it was manufactured in 1980. I did not use a lens hood on this test because I almost never use lens hoods apart with my Samyangs (because they are stored with them) and with teles with integrated hood. But the Takumar did not require lens hood, so my Industar is far behing the Takumar (+ manuel vs. preset aperture, + poor focusing ring)
Forum: Pentax SLR Lens Discussion 11-30-2020, 11:00 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
I am not logged, but have efficient crapblockers (uBlock origin + noscript). I never see any ad.




Yes, this was a typo ;)
Forum: Pentax SLR Lens Discussion 11-30-2020, 10:56 PM  
Takumar 15/3.5 vs. Samyang 14/2.8
Posted By CarbonR
Replies: 9
Views: 441
Of course, alongside with the Laowa 15/4 macro (a 15mm lens that can achieve 1:1 magnification). Who send me one ? :D

In fact that is the Irix 11/4 that is very seductive for me. The 15/2.4 will not have something significatively different from the Samyang, and the 15/4 macro is interesting but only brings macro compared to the 14/2.8. A 11mm lens would be sooooooooo large :D (Samyang also does a rectilinear 10mm but at more than 1000 EUR...)
Forum: Pentax SLR Lens Discussion 11-30-2020, 02:09 PM  
Takumar 15/3.5 vs. Samyang 14/2.8
Posted By CarbonR
Replies: 9
Views: 441
I checked on full res pictures, but I have to reference to be sure that the focus is inded at the same point than the Samyang. The things I am sure about :

- It cannot be a shake blurr, because 1/80s is far from the limit
- all shots are on tripod
- focus is done in liveview x10 because I do not thrust the standard focusing screen of the 6D
Forum: Pentax SLR Lens Discussion 11-30-2020, 02:02 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
I do not get it. This is exactly to avoid any "interference" that I used direct links to full resolution jpegs instead of using the gallery ones :confused:
Forum: Pentax SLR Lens Discussion 11-30-2020, 01:53 PM  
Telephoto lenses for shooting tits : 10 lenses compared
Posted By CarbonR
Replies: 10
Views: 1,445
But you can note that my dummy bird is a small one :p
Forum: Pentax SLR Lens Discussion 11-29-2020, 11:09 PM  
Standard 50-58mm comparison : 18 lenses tested
Posted By CarbonR
Replies: 16
Views: 887
The biggest test I had to do, on 50-58mm lenses :



To facilitate the lenses comparison :
- The 50/1.4 and 55/1.8 together : https://i.postimg.cc/NgQcMyr3/Test-Tak50-55.jpg
- The great old ones : https://i.postimg.cc/GRqc4jKq/Test-anciens.jpg

Industar vs. Tak 50/3.5 : same sharpness but russians do not have "contrast" in their dictionnary
55/1.8 lenses are all equivalent and at the same level than 50/1..4 ones
The Porst is not that bad but f/1.2 is clearly difficult to handle
Lenses with large fungus perform very honestly (it should even be quite correctable) and as expected, the scratch does not affect images
There is indeed a difference between 50/1.8 8 elements and 7 elements, mainly in the bokeh
The Tak 58/2 confirms its reputation of smooth bokeh (Sonnar)
The Tak 58/2.4 confirms the feeling I had about excellent color rendering and messy bokeh
The 45~125 is stille a good lens (did I say it has small fungus ?)
Forum: Pentax SLR Lens Discussion 11-29-2020, 10:44 PM  
100-105mm : 9 lenses tested
Posted By CarbonR
Replies: 3
Views: 495
I already used the 45~125 for general pictures and it rendered very good so I was expecting a good result. This is even better than expected... and the lens has some mini-fungus :D
Forum: Pentax SLR Lens Discussion 11-29-2020, 10:42 PM  
Takumar 15/3.5 vs. Samyang 14/2.8
Posted By CarbonR
Replies: 9
Views: 441
No full frame for the first pic : it would almost say where my house is, that's why I did not add it ;)

Crops are taken where the fous was. I would even say that if we do not guess where the focus is, this means that the lens is not sharp. :confused:
For bokeh, this is not directly for the exemple where I show it, but rather for the second comparison. The Samyang gives a smooth rendering while the Tak is more harsh, both on branches and landscape. I can see the difference even with the picture on a 24" screen.




Tha Samyang being a entry lens (confirmed by the fact that they now have a XP line) and the Takumar a top lens, I really was unsure of the result to be expected. Now I have to admit that the Takumar drifts to the collectors side and my concern is more like "do I want to keep that lens so use it on my Spotmatics ?", but as it is a collectors lens, I cannot replace it as easy as the Samyang if it has a problem...:confused:
Forum: Pentax SLR Lens Discussion 11-29-2020, 02:33 PM  
100-105mm : 9 lenses tested
Posted By CarbonR
Replies: 3
Views: 495
Some 100-105mm lenses and zooms :


Boyer lenses lack of contrast, but I have a doubt about my bellows.
Taks 105/2.8, especially the S-M-C, are very contrasty.
Zooms are a strong surprise, I would not have expected these results from them !
Forum: Pentax SLR Lens Discussion 11-29-2020, 02:19 PM  
Extensive 35mm comparison (7 lenses)
Posted By CarbonR
Replies: 3
Views: 590
I find the 2.3 not that bad taking in account its age, but it is less sharp than some other lenses. The good surprise is clearly the 35/4 which is a good competitor despite being the very first wide angle lens for SLR's !




Yes, the small 35/2 uses radioactive elements and my lens is strongly yellowed ;)
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