Changing lenses


Horst

Link Posted 16/11/2016 - 12:08
It seems to depend a bit on the camera itself.
I bought a K5 about 5 or 6 years ago and I have quite often spots on the sensor.
However 1 year ago I bought a K5IIs secondhand from Japan and I never have any spots on the sensor.
I change my lenses regularly inside the house and outside in the field.
After all what is the point of having an interchangeable lens camera and a few lenses, if you can not change it.
Maybe Pentax manage to make things a bit more dust proof.
But I never use live view.

Regards, Horst
Last Edited by Horst on 16/11/2016 - 12:10

SteveF

Link Posted 17/11/2016 - 13:21
Maybe it's too obvious, but no-one has mentioned switching the camera off before changing a lens. I picked this up a long time ago from somewhere, I don't remember where.

pgweber

Link Posted 17/11/2016 - 13:29
SteveF wrote:
Maybe it's too obvious, but no-one has mentioned switching the camera off before changing a lens. I picked this up a long time ago from somewhere, I don't remember where.

I follow the same rule.
I think I read that it lessens the electrostatic attraction of dust particles to the sensor with the power off.
Peter

Pentax K5
Pentax DA 18-55 Mk1, 50-200 (Samsung), 16-45, , 55-300, 35 f/2.4
Pentax MZ6 + FA28-90, FA50 f/1.4, M 50 f/1.7
Tamron 80-210mm & 28mm

davidtrout

Link Posted 17/11/2016 - 14:30
pgweber wrote:
SteveF wrote:
Maybe it's too obvious, but no-one has mentioned switching the camera off before changing a lens. I picked this up a long time ago from somewhere, I don't remember where.

I follow the same rule.
I think I read that it lessens the electrostatic attraction of dust particles to the sensor with the power off.

Me too - that's when I rememeber and when I've got time. Sometimes its neccessary to make a quick change during shoots. I frequently change lenses, as Nigel and Horst have already pointed out that's the point of having camera with interchangeable lenses.
David
PPG: http://www.pentaxphotogallery.com/artists/davidtrout
Last Edited by davidtrout on 17/11/2016 - 14:37

McGregNi

Link Posted 17/11/2016 - 15:46
Yes, and the point really extends well beyond it just being about a full range of focal lengths ..... The real point of the DSLR is the range of specialised, wide aperture and high quality dedicated optics and accessories available for specific types of images ...

Eg, to add to wide angles and telephotos, standard lenses, zooms and primes etc, there are macro lenses, tilt-shifts, close focusing options, extension tubes and bellows ..... It's arguable that if we do not take advantage of at least a few of these specialised options for our camera, that we are not really using our DSLR as it was intended, and not utilising it's potential.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 17/11/2016 - 15:55

sportyman531

Link Posted 19/11/2016 - 11:58
Thanks for all the helpful advice everyone, my double lens change went smoothly if a little slowly with the first change. Nothing showing up on the dust alert function!
flickr ID: SteveW46243 or sw46246
DA AL 35mm f2.4, K3,18-135 WR, DA 55-300, Pentax KX, K5 x 2, 18-50 50-200 kit lenses, Tamron 17-50 f2.8, Fuji X10, 2x Mamiya 1000s 2x 80mm f2.8, 150mm f3.5, 210mm f4, Yashica 124G TLR, 2x Yashica FX3 Super 2000, Tamron 28mm f2.8, 90mm SP f2.5, 135mm f2.5, Olympus 35RC, 2x Yashica FX2, Kodak Pocket Instamatic, Kodak Box Brownie

JAK

Link Posted 19/11/2016 - 12:23
I've 40 year old SLRs and lenses and none has had a problem with dust, though a cricket did jump into one of the camera bodies once while changing lenses! Just a little too macro.
Re switching camera off while changing lenses, if it happens to be an evf type like the K-01 and Q (and for those that have them micro 4/3 etc.) the sensor will be exposed (shutter open) and far more liable to any dust issues and electrostatic so for these DO turn the camera off first. I'd recommend it too with any camera to be on the safe side, but if you forget don't worry. Just make sure any crickets are extricated from the camera body before putting the new lens on!
John K

Chrism8

Link Posted 19/11/2016 - 12:48
JAK wrote:
though a cricket did jump into one of the cameras Just a little too macro.

You sent him for Six obviously I'll get my coat !!
Chris

www.chrismillsphotography.co.uk

" A Hangover is something that occupies the Head you neglected to use the night before".

-------------------------------------------------------------
K1 - Sigma 85mm F1.4, Pentax 150 -450 F4.5 / 5.6, Pentax FA 24 - 70 F2.8

Sigma 100-300 F4, Samyang 14mm F2.8, Sigma 70-200 F2.8,

K5iis - Sigma 17 - 70 F2.8, Sigma 70 - 300 F3.5/F5.6, Sigma 18 - 200 F3.6 / F4.5.

timd

Link Posted 20/12/2016 - 11:19
If you have a lens on the camera that extends either while focusing or zooming, air and dust is sucked into the body. So not changing lenses while outside to prevent dust inside is a bit of a waste of time.

I've changed lenses as and when needed, with the body facing down and my back to the wind, mostly with the camera on. The sensor is electrostatic, but switching it off does not dissipate the charge quickly. The shutter covers the sensor.

Dust getting on the sensor is just what you have to live with. You just need to manage it and blow it off as needed. I've never resorted to a wet clean. Just my experience!

royd63uk

Link Posted 20/12/2016 - 16:04
I think the moral is NOT to stress about it, I clean the sensor sometimes or clone out the spots.
regards
Roy

Pentax K3 gripped,and some lenses
https://www.flickr.com/photos/pentaxroy/

my pbase gallery

RobL

Link Posted 20/12/2016 - 17:48
timd wrote:
If you have a lens on the camera that extends either while focusing or zooming, air and dust is sucked into the body.

WR lenses are supposed to be dust resistant aren't they?

Gwyn

Link Posted 20/12/2016 - 19:29
RobL wrote:
timd wrote:
If you have a lens on the camera that extends either while focusing or zooming, air and dust is sucked into the body.

WR lenses are supposed to be dust resistant aren't they?

Yes they are, which is one reason dust on sensors is getting rarer, at least in my case. Today though I was swapping lenses about a lot, including old ones (I'd forgotten what a racket they make!) and wouldn't be surprised to find some dust on the sensor. So far no evidence of any though.
Last Edited by Gwyn on 20/12/2016 - 19:29
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