I've been considering the 17-70 SDM lens. Recently purchased a K30 and found just how noisy the kits lenses are. (Pentax need to sort this issue!)

However, reading the manual it says that there is vignetting with the 17-70 lens. (?)

So questions are - why is vignetting worse with certain lenses - or certain Pentax cameras. (I assume it isn't the same with a K5ii ?)

And - how bad is it? Is it a slight effect or barely noticeable ?

[martym]

They mean with the pop up flash because with lens extended it blocks some of the light from the flash.

[ramseybuckeye]

What Martym said is correct. The shadow will be bad too. I've used the popup a couple times with the 18-135 (not even on the list) and it creates a large shadow.

It will be fine to use without the popup flash.

I've been considering the 17-70 SDM lens. Recently purchased a K30 and found just how noisy the kits lenses are. (Pentax need to sort this issue!)

However, reading the manual it says that there is vignetting with the 17-70 lens. (?)

So questions are - why is vignetting worse with certain lenses - or certain Pentax cameras. (I assume it isn't the same with a K5ii ?)

And - how bad is it? Is it a slight effect or barely noticeable ?

Over 8 years and 7 Pentax DSLRs, I've never used the pop-up flash. I've used on camera hot shoe flash at events and I use off camera flash and/or mono lights a lot. Zero issues.

The DA17-70 is a very versatile lens. I mostly use it in small dance studios or as a walk around. My working kit is a pair of K5IIs bodies. Wife went to a farmers market for canning tomatoes a few days ago, I went along as the chauffeur and bag boy, taking a body with the 17-70. Here's the gallery on my blog Colors of July.

Most of these galleries were made with it (except dress rehearsal) Picture Days & all the Santa pictures

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Last edited by Brooke Meyer; 07-05-2015 at 01:51 AM.

Thanks for the replies.
Whilst you can get a shadow from longer lenses I think this problem is referring to normal use of the lens.
I had envisaged it meaning pixel vignetting but I think it is meaning the darkening in the corners.
Was the lens designed for a smaller sensor? The problem seems to be fairly common but you'd think the more expensive lenses wouldn't ironed out this problem(?)

I've found the page - 257 of the manual. It says the problem is only under 24mm.

[Al_Kahollick]

I've found the page - 257 of the manual. It says the problem is only under 24mm.

That page heading reads as follows:




"Lens and Built-in Flash"


You're fine using them with available / sufficient off camera lighting.

D'oh! Somehow I missed that. Thank you !