Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-19-2010, 12:37 PM   #1
Senior Member




Join Date: Sep 2009
Location: Beautiful Bavaria :-)
Posts: 123
Aperture position when storing a lens

If I want to store an unused lens not attached to a camera, what is the best position for the aperture ring:

- wide open (largest aperture) like mounted on the body?
- fully closed (smallest aperture)?
- A position if available locked in or not?
- MF/AF clutch in MF position or AF?

Due to the fact that Pentax has mechanical aperture control with springs I would be curious whether it is better to have more or less tension on those springs to keep the alive for as long as possible...

Any advice or experience in this field?

Thanks in advance!

10-19-2010, 12:59 PM   #2
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
I have never bothered about this.

Note many lenses may be defaulting to either stopped down

SMC-FA-J and DA lenses for example as they have no aperture ring.

Lenses with an A setting are either stopped down (A position) or at where ever the aperture ring leaves them

Non A lenses could be left anywhere.

Having said I never bothered about this, I do note that I have seen some vivitar (by kiron) lenses and kiron lenses with oil all over the blades when stored in the open position. I don';t know if this is related or not because I have the impression Kiron lenses from the late 70's and early 1980's are prone to this.
10-19-2010, 01:08 PM   #3
Veteran Member
fotaki's Avatar

Join Date: Aug 2008
Location: Greece and UK
Photos: Gallery | Albums
Posts: 309
Wow!! I think you've opened a can of worms here.

I have no technical based opinion on this but purely from the point of view of observing new lenses straight from the box, they all seem to arrive with the diaphram wide open. This would seem to suggest that lens manufacturers do have a preference.
10-19-2010, 01:25 PM   #4
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by fotaki Quote
Wow!! I think you've opened a can of worms here.

I have no technical based opinion on this but purely from the point of view of observing new lenses straight from the box, they all seem to arrive with the diaphram wide open. This would seem to suggest that lens manufacturers do have a preference.
Note, not all.

see my comment above, the FA-J and DA lenses do not have an option, the aperture si stopped down when not on a body, as is any A lens when dismounted in the A position.

Additionally In my Tamron instruction guide that came with my XR Di 28-75F2.8 there are no storage instructions, and with my sigma APO 70-200F2.8 EX ther eis the following

Basic care and storage

- avoid shocks and exposure to extreme high or low temperature or to humidity
- for extended storage, choose a cool and dry place, preferrably with good ventilation. To avoid damaging the lens coating keep away from mothballs or naphthalene gas.
- do not use thinner, benzene, or other organic cleaniong agents to remove dirt or fingerprints from the lens elements. Clean using a soft moistened cloth or tissue.
- this lens is not waterproof. When you use thelens in the rain or near water, keep it from getting wet. It is often impractical to repair the internalmechanism, lens elements, and electric components damaged by water
-sudden temperature change may cause condensation or fog to appearon the surface of the lens. When entering a warm room from the cold ourdoors, it is advisable to keep the lens in the case until the temperature of the lens approaches room temperature.

Seems crystal clear to me, they simply don't care about aperture.

Note also, while we are discussing pentax lenses here, many other makers have apertures that close automatically and open with the activation lever, canon and olympus come to mind immediately

10-19-2010, 01:52 PM   #5
Veteran Member
fotaki's Avatar

Join Date: Aug 2008
Location: Greece and UK
Photos: Gallery | Albums
Posts: 309
Lowell Goudge.....I posted my reply before having the oportunity to read yours. As i said, mine was a non-tech opinion, Whatever...
10-20-2010, 12:31 PM   #6
Senior Member




Join Date: Sep 2009
Location: Beautiful Bavaria :-)
Posts: 123
Original Poster
QuoteOriginally posted by Lowell Goudge Quote
I do note that I have seen some vivitar (by kiron) lenses and kiron lenses with oil all over the blades when stored in the open position.
Hi Lowell: Do I understand correctly: storing the lenses with the aperture ring set to the largest (f 1:2 or 1:2.8) aperture caused the problem of the sticky blades?

Pentax Germany answered me today, they basically said (in surprisingly wrong German, sounded like translated by a computer from Vietnamese...) that it doesn't much matter, but if you want to be 'precise' keep the aperture ring wide open.

Hmmm...
10-20-2010, 12:35 PM   #7
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by Vranx Quote
Hi Lowell: Do I understand correctly: storing the lenses with the aperture ring set to the largest (f 1:2 or 1:2.8) aperture caused the problem of the sticky blades?

Pentax Germany answered me today, they basically said (in surprisingly wrong German, sounded like translated by a computer from Vietnamese...) that it doesn't much matter, but if you want to be 'precise' keep the aperture ring wide open.

Hmmm...
No, not exactly. It is an observation that the normal storage of the lenses involved was wide open, however the lenses involved have a reputation for sicky blades anyway, but when you consider that if the lens is stopped down, any oil coming from the focusing helix grease will not necessairly hit the aperture (because the blades are largely between the lenses when stopped down, it is possible.

the real issue with sticky apertures is a grease that releases too much oil or that brakes down and turns to oil, and not the storage position of the aperture, however, it couldbe possible that for lenses which have a reputation for oil coming out of the focusing helix grease, storing the lens stopped down may prolong the time before the blades stick.
10-20-2010, 01:37 PM   #8
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
QuoteOriginally posted by Lowell Goudge Quote
No, not exactly. It is an observation that the normal storage of the lenses involved was wide open, however the lenses involved have a reputation for sicky blades anyway, but when you consider that if the lens is stopped down, any oil coming from the focusing helix grease will not necessairly hit the aperture (because the blades are largely between the lenses when stopped down, it is possible.

the real issue with sticky apertures is a grease that releases too much oil or that brakes down and turns to oil, and not the storage position of the aperture, however, it couldbe possible that for lenses which have a reputation for oil coming out of the focusing helix grease, storing the lens stopped down may prolong the time before the blades stick.
The way that the aperture assembly is constructed, once oil gets near the assembly, it's going to get everywhere, no matter what position the blades are stored in.

Oil on the blades should be an indication that the whole lens is due for a strip-down cleaning.

10-20-2010, 05:56 PM   #9
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,442
FWIW, I have a fair number of lenses (some quite old) and have owned some of them for almost 30 years. I have never paid any attention to the position of the aperture scale, have had no problems, and don't believe that it makes any difference.


Steve
10-20-2010, 05:59 PM   #10
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,135
It doesn't matter, since the stop-down lever is always wide-open on lenses with automatic diaphragms, and the aperture ring merely limits how far it'll go.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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!
aperture, k-mount, lens, pentax lens, position, slr lens, springs
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I remove the "A" position lock on my aperture ring MikesChevelle Troubleshooting and Beginner Help 17 02-13-2010 02:52 PM
Storing the lens collection Pentastic Pentax SLR Lens Discussion 5 11-12-2009 09:58 AM
Av mode with lens not on A position sajah Troubleshooting and Beginner Help 16 04-18-2009 10:03 AM
How does the 'A' position on an FA lens work.. katanaismybike Pentax SLR Lens Discussion 3 02-05-2009 11:43 PM
Storing Lens on the Camera? Joe_M Pentax DSLR Discussion 8 01-03-2008 06:47 PM



All times are GMT -7. The time now is 04:46 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