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Monday, September 09, 2013

When the Wrong Lens Hood is Used for the Same Lens..

Then vignetting or even dark corners will happen, for the case of the same Q 02 lens that is used on a Q/Q10 versus a Q7, see the following test:

http://bbs.kakaku.com/bbs/K0000264454/SortID=16353126/?Reload=%8C%9F%8D%F5
(in Japanese, Google translation to English Here.)

So, the new flower-shaped lens hood must be purchased separately for the old lens owners, otherwise the old lens hood cannot be used, since it is incompatible.

It seems that Pentax had no good planning in changing the sensor size, so just causing this problem.

Btw, according to the test results, the dark corners are even larger in area when the automatic lens correction is turned off. Do note also the serious barrel distortion of the 02 lens that actually produced, which is terrible:



When it is corrected, it looks somehow better, see and compare:



So, nowadays, the trend of those camera and lens manufacturers are giving us junk lenses, and then images are corrected by software. Of course, there is no free lunch after all, some IQ must be lost and the correction would never be perfect.

Comments (4)

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OK Rice, lets see you design a lens that small without any distortion. Pretty much all the compact cameras have major distortion as a compromise for size. Same with a lot of m4/3 lenses. My FA 28-80 has some fairly noticeable distortion too. So does my 16-45 and my 18-55. I guess they are all just junk.
2 replies · active 600 weeks ago
The native distortion of the Q 02 zoom lens is terrible, admit it or not.
Well. At its worst it is 5%. So, yeah pretty bad. My point was this was becoming an acceptable compromise for manufacturers and some micro 4/3 lenses exhibit similar distortion. Designing small lenses without distortion is a real challenge so they cheat. Pentax isn't alone.
paranoia23's avatar

paranoia23 · 600 weeks ago

wtf ?! ... you could really doing a spendid job with your blog if you wouldn't add this sensless threads... should they sell you a hood that is too short because maybe ... they will come up with a bigger sensor in the future ?!

even if not being as stupid as the PF idiots ... you could do better

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