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Forum: Pentax News and Rumors 03-01-2017, 02:05 PM  
Irix 15mm f/2,4 for full frame K-mount
Posted By daimonwn
Replies: 457
Views: 77,217
Is there any sense to change Samyang/Rokinon 14mm /2.8 on this Iris lens? Did anyone compare this two lenses?
Because I have Samyang 14mm for landscape and asto shooting and I like it except next thing: I can't put round filters and take off lens hood, strange mustache distortion.
With Irix 15mm I have opportunity to use filters and rear gel filters, acceptable distortion. Also I like focus ring lock function, infinity click function. But also read that some lenses have bad optical quality with discentered effect. And at /2.8 aperture sharpness in the corner quite soft (Samyang has perfect sharpness all over the frame at /2.8).
So tell me please change Samyang on Irix or not? Thanks!
Forum: Pentax K-1 & K-1 II 10-08-2016, 02:01 AM  
Post K-1 bugs/issues (feedback for Ricoh)
Posted By daimonwn
Replies: 429
Views: 67,762
After upgrade to 1.30 appeared awful back focus with all lenses and AF become has his own life...
With 24-70 even total +20 (+10 for lens and +10 for all lenses/camera) doesn't help.
Another lim lenses always give different results if I autofocus from infinity (ofen give bac-kfocus) or from MDF (ofen give front-focus). There is no a stable same result even with AF tune adjustment.
I have 5 AF lenses and none of its doesn't have a correct AF.
But with my old K-5 I haven't any such problems with all this lenses (exception 24-40 has +10 adj.)!
I started hate Pentax and especially my K-1...
Forum: Pentax SLR Lens Discussion 05-19-2016, 10:23 PM  
Sigma 100-300 autofocus problem
Posted By daimonwn
Replies: 42
Views: 8,006
Nope, I'm from East Europe. And my official Sigma service centre can calibrate only for Canon and Nikon bodies. Pentax? Hahaha what is a Pentax?

---------- Post added 05-19-16 at 10:26 PM ----------


by yourself or by service centre?
Forum: Pentax SLR Lens Discussion 05-19-2016, 04:20 PM  
Sigma 100-300 autofocus problem
Posted By daimonwn
Replies: 42
Views: 8,006
Yes. Even if I make adjustment and for lens (+10) and for body (+10) together (total +20 or -20) result is a same... it's absent.
With another lenses adjustment is working. Problem only with Sigma 100-300.
Forum: Pentax SLR Lens Discussion 05-19-2016, 03:50 PM  
Sigma 100-300 autofocus problem
Posted By daimonwn
Replies: 42
Views: 8,006
Does inbuilt AF adjustment work with this lens?
I have a front focus on both K-5 / K-1 but inbuilt camera AF adjustment hasn't any effects unfortunately.
Can someone check this trouble with their own lens?
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