Search results for 'sensor cleaning' - page 123
K24 colour rendition
It comes down to a simple calculation - how much did the lens cost, how much will it be worth when cleaned, and how much does professional cleaning cost? Apart from the internal dust issue, my K24 is in mint condition with perfect optics. How much is it worth? Is it a hard to find lens?
Posted by bjolester on 31/07/2010 - 16:00
Front back focus calibration on K20D
Is this a really accurate test? Are you sure those three batteries are exactly parallel to the sensor plane? If that hasn't been measured very carefully and they have all just been placed by eye then the adjustment may not be meaningful.
Posted by johnriley on 02/08/2010 - 08:49
Front back focus calibration on K20D
Is this a really accurate test? Are you sure those three batteries are exactly parallel to the sensor plane? If that hasn't been measured very carefully and they have all just been placed by eye then the adjustment may not be meaningful. The idea is that they are NOT exactly parallel to the focussin...
Posted by Mannesty on 02/08/2010 - 09:24
Lens Hood for Pentax 55-300 DAL
And yes, if the lens rotates, a petal hood is fairly useless, I'm told - but I believe it is more to do with light trajectory down a long-focal-length lens that means all tele-lens hoods are 'tubes' rather than petals. I'd have to defer to the experts on that point, though, and there are many here! ...
Posted by Anvh on 14/08/2010 - 20:09
Pentax FA* 400mm f/5.6 ED IF
Mike, you can get a variation with TC's, so it's unlikely that the Bigma will be that far out on focal length. The 1.4x and 1.7x are just very nominal figures. At 2m the Pentax 1.7x would be 1.3x on a 200mm lens and 2.7x at infinity. The Sigma 1.4x would be 1.3x and 1.8x (Source AP Test 9th April 19...
Posted by Algernon on 07/08/2010 - 09:51
Sigma 70-300 apo lens , Advice needed.
I had a similar issue to Colin with my K10D and Sigma 70-300 APO DG. After much frustration with soft images at 300mm, I took both items to the CR Kennedy (Pentax and Sigma importers) Service department here in Melbourne. They said that they could 'match' the two items together - a statement ...
Posted by bento2 on 10/08/2010 - 22:52
Sigma 70-300 apo lens , Advice needed.
I had a similar issue to Colin with my K10D and Sigma 70-300 APO DG. After much frustration with soft images at 300mm, I took both items to the CR Kennedy (Pentax and Sigma importers) Service department here in Melbourne. They said that they could 'match' the two items together - a statement ...
Posted by suffolkcolin on 14/08/2010 - 08:40
Something expensive is broken...
I've got the latest firmware, but cleaning the contacts fixed it. How weird! Thanks guys - option 3 it was! Man, with this new job I've got the time to take photos has really really shrunk. Hope I can find time in the next few weeks!
Posted by whelmed on 15/08/2010 - 22:40
43 Limited Possible Problem.
Try cleaning the lens and mount contacts with a soft clean cotton cloth. It may be a lack of communication between lens and body.
Posted by johnriley on 15/08/2010 - 22:55
43 Limited Possible Problem.
I have no problem focussing to infinity with my 43 but, like nearly all AF lenses, it will focus past infinity at the end of the throw. So if you were overriding the camera and focussing manually (without backing off just a smidge) then that could be the reason for your blurry shots. Otherwise I'...
Posted by hefty1 on 16/08/2010 - 00:29
Wide Angle or Fish Eyes?
The 50mm lenses you've seen are known as primes - they have a fixed focal length so no, you can't zoom with them. The wider aperture allows faster shutter speeds but also allows you to control the depth of field and isolate the subject from the background more effectively. Wide angle does eventu...
Posted by Dangermouse on 17/08/2010 - 14:48
Fungoid M-100/4 macro
...Read a few threads but nothing referring to this lens. Super Takumar 50/4, FA50/2.8, FA100/2.8, Tamron SP90/2.5 (2 versions) Thisl link will provide some reviews of the lens itself (not cleaning info). I have the same lens in Pentax K: very nice :D, however, only goes to 1:2 magnification. ...
Posted by Banjo on 18/08/2010 - 06:19
Pentax FA28/2.8 disassembly
Hi Graham, I have the FA 28/2.8, it is a different design to all other 28mm Pentax lenses and IMHO the equal best optically the other being the K 28/3.5. Well worth spending a little to have it serviced. All my lens service/repairs have been handled by Michael Spencer, factory trained 47 years exper...
Posted by johnwhit on 20/08/2010 - 11:48
Sigma 17-70mm 2.8-4.5 stopped reporting focal length to camera
Got a similar problem with my 135-400. Neither my K7 or K20 can pick up the aperature info when in A setting. Works OK with an MZ-S in non A setting, so must be a contact associated with the A setting. No joy with cleaning solution. Was thinking of sending it to Sigma for a service but haven't ...
Posted by Steve Chasey on 24/08/2010 - 13:26
Lens Test Charts
Thanks Stefan, I'll read through that tomorrow, but that's not as high as the resolution I'm talking about. Zeiss have managed 400lpmm on film (which is really tiny 0.0025mm). This gives the maximum digital resolution as 87.5lpmm which means the testing setup doesn't need to be anything more than ...
Posted by Anvh on 26/08/2010 - 22:03
40mm f/2
I have an SMC Pentax M 2.8/40 Pancake. I should use it more.:( (All my SLRs are FF and have a replaceable organo-chemical sensor.:lol:)
Posted by Banjo on 01/09/2010 - 07:14
40mm f/2
If it's anything like the old Super A then selecting shutter priority mode will enable you to set the aperture - a rather crude way of doing so but it'll get the job done. As you adjust the shutter speed the camera will set the aperture to match, so you just need to find the shutter speed at which y...
Posted by Dangermouse on 01/09/2010 - 16:44
SMC PENTAX-F 1:1.7 50mm vs fixed aperture zoom lens?
I find the 50mm on a crop sensor dslr is a bit long , good for portraits. I have the sigma 17-70mm f2.8-4.5 and find it a great range for a walk about lens. I rarely find my self needing anything any wider than 17mm or longer than 70mm, wish it was a bit faster for low light stuff but then it ...
Posted by Paul_C on 31/08/2010 - 17:34
Windolene
Does having used saliva count? :lol: I had one lens that wouldn't clean up at all, there was some sort of grease on the front element which the lens pen would only make a pretty pattern in. I licked a finger and wiped it gently over the surface (as I was out with no access to the normal optical c...
Posted by Dangermouse on 04/09/2010 - 14:54
Windolene
Saliva is probably fine as long as you haven't been drinking Windolene.:lol: I'm sure we've all had stubborn sticky marks on lenses and filters at some time. Most lens cleaning solutions are mostly water with tiny amounts of alcohol and detergent. I use 'Selvyt' cloths and have done for many y...
Posted by gartmore on 04/09/2010 - 15:08
