Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-12-2007, 09:19 AM   #1
New Member




Join Date: Jul 2007
Location: Dublin, ie
Posts: 24
Internal dust

Hi All. I bought a Vivitar Series 1, 105mm macro from ebay boxed/sealed + unused. Today, I noticed that there seems to be a single speck of internal dust behind the front lens element. I'm worried that this might show up in my shots... does anybody have any experience with anything like this? Is there a particular test I can do to see if it will show up? Is it possible to get it cleaned?

I'd rather not send the lens back as it's unlikely that I'll find another one like it anytime soon...

Cheers,

Paul

09-12-2007, 10:29 AM   #2
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
don't worry about it. this lens ....



still shoots this.

09-12-2007, 10:36 AM   #3
Site Supporter
Ahab's Avatar

Join Date: Jul 2007
Location: Oracle, Az
Photos: Gallery | Albums
Posts: 739
Wow, Roy! I would have never guessed. Great shot, it grabbed me right away.
09-12-2007, 11:35 AM   #4
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
like i said, don't woory about it. from the looks of my 105mm it seems that the filter ring on this lens can be taken off by loosening 3 screws that you get to by sliding the lens hood forward. it might also release the the front element. if not then you'll need a spanner wrench to remove the 1st element. shouldn't be too hard. DO NOT remove the screws, just loosen them. you'd never get them back in if you take them off completely.

09-12-2007, 11:55 AM   #5
New Member




Join Date: Jul 2007
Location: Dublin, ie
Posts: 24
Original Poster
Thanks Roy, I think I'll take your advice and not to worry about it. Great shot above, by the way.

Cheers,

Paul
09-12-2007, 01:17 PM   #6
Senior Member




Join Date: Aug 2007
Location: SK, Canada
Posts: 108
That's a rough looking element on that lens. Without seeing that, I would say that one single speck inside your lens isn't going to matter. I have several lenses with more than one piece of dust internally and have never noticed it. I'd be more worried about dust on the sensor then on/in the lens.
09-12-2007, 03:42 PM   #7
Veteran Member




Join Date: Jun 2007
Location: California
Posts: 426
A tiny spec won't matter. Yes it's blocking light, but remember the sensor is receiving light information from multiple directions. It's not "this one point on lens leads to this one pixel on my camera" because that's not the object the len is focused on
09-12-2007, 05:33 PM   #8
Veteran Member
Fritz's Avatar

Join Date: Jun 2007
Location: Tillamook, OR
Posts: 1,168
I didn't know lenses came without dust inside.

But seriously, a few specs shouldn't cause a noticeable problem with your picture quality. I posted a similar question about a small scratch that was inside my Vivitar 105mm f2.5. One of the responders posted this link.

Vintage Folding Cameras

Put it in perspective for me. Things apparently have to be really bad before it will be noticed.

09-12-2007, 05:41 PM   #9
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
Things apparently have to be really bad before it will be noticed

look at the damage on the lens i posted. i've shot hundreds of other shots just as good as the one i posted. i just sold some poor soul this lens that's posts to this board and he,s tickled pink about it. actually it does better now because i took a marksalot and blacked out the worse of the damage.

oh, one speck of dust = i pixel on the the sensor?? not on your life..
09-12-2007, 05:42 PM   #10
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
Things apparently have to be really bad before it will be noticed

look at the damage on the lens i posted. i've shot hundreds of other shots just as good as the one i posted. i just sold some poor soul this lens that's posts to this board and he,s tickled pink about it. actually it does better now because i took a marksalot and blacked out the worse of the damage.

oh, one speck of dust = i pixel on the the sensor?? not on your life..
09-12-2007, 06:36 PM   #11
New Member




Join Date: Jul 2007
Location: Dublin, ie
Posts: 24
Original Poster
Thanks for all the replies guys. However, I've now got another problem. I was taking some test shots against a white wall with small apertures to see if I could spot the dust on the lens... It seems now that my sensor has quite a lot of dust on it. I don't think I've ever used my camera with an aperture as small as f/16 prior to this, so I guess it could be possible that it's been like this since I bought it about a month and a half ago..???



The dust removal function on my K100D Super body isn't helping. I've looked at the sensor with a flashlight and am unable to see any dust particles. Is this normal or is it usually possible to see the dust?

What do you think is the best way to go about cleaning this (Preferably without voiding my warranty)? Should I get it cleaned professionally, or do you think I'll be able to remove this with a blower? Also, if I was to get it cleaned professionally (not by Pentax) I assume this would void my warranty... but will Pentax know ?

By the way the Pentax website is awful, I'm unable to find any information about service centres located in Ireland, if there is one...

Cheers,

Paul

Last edited by dropbear; 09-12-2007 at 06:47 PM.
09-12-2007, 09:27 PM   #12
Veteran Member




Join Date: Jun 2007
Location: Buffalo/Rochester, NY
Photos: Albums
Posts: 1,133
There are lots of cleaning methods and products you can use, although if you're not comfortable messing around with your DSLR's "eyeball" then by all means take it in to someone.

I doubt a cursory sensor cleaning would qualify as a warranty-breaker. As long as they don't use the wrong chemicals/methods that is.

It's not that difficult to do as long as you have the right materials and info, such as the proper swabs and cleaning solution.

I found this website a while back and it does have some good generic how-to info on how to clean a camera's sensor (generic site, not camera focused - no pun intended).
Cleaning Digital Cameras - Introduction
09-13-2007, 05:41 AM   #13
roy
Inactive Account
roy's Avatar

Join Date: Sep 2006
Location: D/FW area, Tx.
Photos: Gallery
Posts: 1,712
here's what you need. this is very easy to do. please read Frogroast's post first because it's about the best site i've seen.

https://www.micro-tools.com/store/item_detail.aspx?ItemCode=E2-KIT4-F
09-13-2007, 09:18 AM   #14
Veteran Member




Join Date: Sep 2006
Photos: Gallery
Posts: 5,713
That looks like a nice affordable kit Roy,
I'll have to order 1 soon for the times that my sensor gets bad.

dropbear, I had a similar problem with my K100, and after not being able to find the dust I snapped on a different lens.
The dust disappeared.

I looked at the bottom of the lens, and had a few specks on it. Just blowing it off cured my problem.
It would appear that although the outer element can be full of dust the inner element can't be
09-13-2007, 05:38 PM   #15
New Member




Join Date: Jul 2007
Location: Dublin, ie
Posts: 24
Original Poster
Thanks for the replies everybody. I'll probably pick up some cleaning kit at the weekend (and let you know how it goes). It'll probably cost about twice the price as the link to the kit you post roy... such is the way in Dublin
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
dust, k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K-7 Dust Alert and Dust Removal Functions brosen Pentax DSLR Discussion 9 02-09-2016 04:43 AM
Internal Dust & Cleaning - Pentax-M 50mm/1.4 ManhattanProject Pentax SLR Lens Discussion 3 08-16-2010 12:17 PM
DA 40mm F2.8 internal dust 2form Pentax SLR Lens Discussion 1 06-26-2010 02:20 AM
Blowing dust. Will I get more dust inside ? alphalt Pentax DSLR Discussion 7 05-12-2010 10:09 PM
SMC 85mm f/2 internal dust? Dealchzr Pentax SLR Lens Discussion 10 06-03-2009 11:55 AM



All times are GMT -7. The time now is 11:58 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top