Search results for 'sensor cleaning' - page 134
Which Superzoom ?
Hi folks I am sure that this must have been discussed before but I wondered if any new products had come out... I am looking to buy a superzoom - something like a 18-250. I have the 18-55 and a 50-200 but I'm getting a bit fed up with getting dust on the sensor - as I came from a bridge camera...
Posted by justa on 23/06/2011 - 21:24
Which Superzoom ?
I'm not sure where your sensor dust is coming from - I hardly ever suffer from it despite changing lenses pretty frequently. Not sure if you're already doing this, but try holding the camera pointing downwards while changing lenses, change the lens quickly and don't leave the camera without a le...
Posted by Dangermouse on 23/06/2011 - 22:09
Which Superzoom ?
thanks for the replies I have had a problem with dust on the sensor since pretty much day one - its driving me mad !! I change the lenses as instructed but still end up with dust that I have to remove with aperture. I understand the advice about having interchangeable lenses is part of owni...
Posted by justa on 25/06/2011 - 09:35
Which Superzoom ?
Tamron's 18-270mm superzoom is reviewed in today's Am Photographer. A hell of a zoom range, but it does result in some sacrifice of definition, etc. Also max apertures are f/3.5 to f/6.3. And the RRP is £665 :( It has Tamron's own optical image stabiliser built in (VC: Vibration Compensation). I ...
Posted by OldTaffy on 25/06/2011 - 15:59
Which Superzoom ?
[quote:3496ace15f="justa"]thanks for the replies I have had a problem with dust on the sensor since pretty much day one - its driving me mad !! quote] Tried a rocket blower ?? Shifts any noticeable dust just fine for me. Failing that how about try cleaning the sensor ?
Posted by bladerunneruk on 27/06/2011 - 13:24
Sigma 10-20
I wouldn't be without mine (f4-5.6 version). It must be said that I only use it at 10mm, so a 10mm prime that achieves that sort of IQ would be nice and perhaps smaller and lighter. Occasionally I've tried 12mm or even the other end at 20mm, but I prefer to keep it at 10 and move to get the right e...
Posted by karma mechanic on 25/06/2011 - 09:56
DA*16-50 Comments
Steve - the forgettory has forgotten :D :P I think I was experimenting with focus adjustment methods. The standard method is to use a focus assist chart at 45 degrees (horizontally preferably as shown by Pentax's service manual, which keeps the camera level). I was probably making use of the p...
Posted by MattMatic on 30/01/2012 - 15:22
DA*16-50 Comments
I thought that LCAs are kinda easy to correct on RAW? It depends on the terminology... ( ) Lateral, or Transverse CA can be corrected in RAW easily. Longitudinal, or Axial CA is a pain and cannot be easily corrected. I can do it in Photoshop without too much trouble, but it's a manual proces...
Posted by MattMatic on 31/01/2012 - 10:56
Some new lenses
As it happens I am interested for various reasons, not least of which is whether or not the resolution and general optical qualities stand up to the rigors demanded by the K-5 sensor. There's only one way to find that out and I've been exploring it this week. However, what I don't quite get is wh...
Posted by johnriley on 01/07/2011 - 23:45
Some new lenses
The third lens test of this group is now up and running on EPZ: http://www.ephotozine.com/article/smc-pentax-fa-77mm-f-1-8-limited-lens-16892 Just remember that we take the measurements and take the pictures first and then reach the conclusions based on the results, which are updated results i...
Posted by johnriley on 07/07/2011 - 09:22
Some new lenses
Pentax themselves have said that we're at the limit of where these Limited lenses can perform Is that just from a comment Ned made on his blog? Or is there another source? I believe the resolution limit of some of the best prime lenses available is somewhere just North of 15MP (16MP?) so adding mo...
Posted by johnwhit on 07/07/2011 - 16:51
Some new lenses
TBH that is good news in a way. I would hate to have to get rid of an entire system. I guess we could have a situation where all the technolgy is behind that of the sensor- Printers, monitors, lenses. So in a way your camera sensor only needs to be as good as the best performing lens/monito...
Posted by japers45 on 07/07/2011 - 18:13
Some new lenses
TBH that is good news in a way. I would hate to have to get rid of an entire system. I guess we could have a situation where all the technolgy is behind that of the sensor- Printers, monitors, lenses. So in a way your camera sensor only needs to be as good as the best performing lens/monito...
Posted by Don on 07/07/2011 - 18:20
Some new lenses
how relevant is this for lenses designed specifically for APSC then. Are you saying that if Pentax bring out a 20mp APSc down the line that none of the current lenses available would be able to take advantage of the extra resolution? There are very few lenses that can outresolve the "benchmark ...
Posted by johnwhit on 07/07/2011 - 18:31
Which Lens
Don't know about the sigma, but the tamron does suffer from purple fringing in high contrast situations. I'm not sure that would be the case with film, it may be an issue with the digital sensor more than the lens. John
Posted by johnwhit on 01/07/2011 - 07:15
Which prime for general use?
I quite liked the 40mm M lens for my film camera as a general purpose lens. It was a frequent focal length choice for many of its contemporary compact cameras too before they started to acquire zooms (eg the Olympus 35RC that I had.) Therefore my ideal DA prime lens for the APS-C sensor would hav...
Posted by JAK on 02/07/2011 - 22:49
Which prime for general use?
Therefore my ideal DA prime lens for the APS-C sensor would have to be a 28mm, but it doesn't exist! I have a 28mm A lens which is great with the digital bodies and an FA version is available too but they are only f2.8. I know what you mean about the 28mm. Perfect focal length, but if the Sigma F1.8...
Posted by Offertonhatter on 02/07/2011 - 23:29
advice on lens
All you need to know about using lenses intended for film on digital is that they will have a different field of view. The Pentax DSLR sensors are smaller than a frame of 35mm film, so a 28mm lens is no longer a wide angle one (hence why your kit lens is an 18-55mm, roughly equivalent to the 28-80mm...
Posted by Dangermouse on 05/07/2011 - 20:51
Lenses we use, lenses we don't...
I never change lenses out of doors or in the car (aversion to dirt and dust getting in, although it still does, of course!), so I have to make a decision what to fit before leaving home. I know the mk1 kit lens will do everything I want it to do (although an extra bit of reach at either end woul...
Posted by bwlchmawr on 09/07/2011 - 07:37
Help me choose
What's most interesting here is the extraordinary quality of the Pentax kit lens, esentially a lens which was "given away" with various cameras. I have no axe to grind on this one: I don't own any expensive or exotic limited lenses nor ever will. I must be very lucky with my version of the mk...
Posted by bwlchmawr on 06/07/2011 - 19:34
