Search results for 'sensor cleaning' - page 157
AF Adjustment
Every K mount body would have to be calibrated with every inastance of every lens and store that calibration against the serial number of those lenses. There must be billions on combinations, given there's thousands of bodies and thousands of lenses. Not if you stored the lens calibration parameters...
Posted by Smeggypants on 14/02/2014 - 14:07
AF Adjustment
The calibration is to make sure the path of the focussed light is exactly the same to the main sensor as it is to the AF sensor. I'm sure there a number of tolerences contributing to such an inaccuracy not just lens mount thickness. Lens mount thickness or anything else doesn't affect contrast AF...
Posted by Smeggypants on 15/02/2014 - 01:30
A weak lens...
The DA21 is pretty slow at f3.2 for street photography. I too would recommend the GR or perhaps, even better, the GRDIV, which is f1.9. It will be noisier but that doesn't really matter for street, often adds to the mood. The smaller sensor can work to your advantage with a greater depth of field...
Posted by DrOrloff on 20/02/2014 - 18:28
A weak lens...
Well the Q with the long promised and never forthcoming wide angle prime would have been good. The 01 lens is 47mm equivalent which certainly has a use but I often find it too long as a single street lens solution. The classic combination of wide and normal on the Q would have made for a very good...
Posted by DrOrloff on 20/02/2014 - 19:23
A weak lens...
I don't much but when I do then I find the best option is my Ricoh GRDII which I bought it as a tryout for a GR. I am still undecided as I would ideally like a 35mm equivalent. I want something that is suitable for street and is compact enough to take absolutely everywhere but will also give me to...
Posted by DrOrloff on 20/02/2014 - 19:50
A weak lens...
I am still undecided as I would ideally like a 35mm equivalent. If you're happy with 10MP the GR has a nice 35mm equ crop mode, which still gives around the same sensor area as m4/3. There's also a 47mm crop, but that might be pushing it a bit far... I read in some interview somewhere that Rico...
Posted by weinelm on 20/02/2014 - 20:23
New Tamron lenses on the way.....
That would have been me Russ, yes they have an 11% share in Tamron but they also have a seat on the board at Olympus and allegedly, that new sensor in their camera's is a Panasonic, so you never know? If Tamron want to really sell lenses eventually they will have to do em again in K mount, the mark...
Posted by jules on 22/02/2014 - 10:03
New Tamron lenses on the way.....
That's interesting that Olympus have gone back to the Panasonic 4/3 sensor. I thought the Sony was superior. Perhaps we may get the 18-300 one day but without the VC. Wow 150-600, now that would be seriously good at the airshows.
Posted by Russ on 22/02/2014 - 10:58
85mm Portrait Philosophy
As a general principle, the marque lens will be better made, have a better longevity without needing service and may or may not be better optically. I'd ask why you think 85mm is the best focal length for portraits? It was the classic portrait lens in film camera terms, but the APS-C sensor is a ...
Posted by johnriley on 26/02/2014 - 08:49
SMC M LENS
I think you would have trouble beating that 50 1.7 The 135 3.5 will get you further back, and my copy is one of the sharpest lenses I own wide open, which always helps for eyes etc. (you can easily soften an image from a good lens, but you'll never get a poor one sharp) +1 for the M135/3.5. My copy...
Posted by kh1234567890 on 27/02/2014 - 10:40
Fisheye for Pentax
Here is an interesting thought to ponder. The SMC-DA 10-17mm Fisheye zoom is currently £329. On the other hand, if you get a Pentax Q10 with the 5-15mm and the Fisheye "toy" lens from SRS, you would pay £318. So £11 less. So what would you do? Pro's of the 10-17 It is APS-C It is a z...
Posted by Offertonhatter on 27/02/2014 - 20:04
Lens hood 12-24mm
Thanks guys - rapid responses and very helpful (I love this forum). I thought I'd checked SRS and thought it was more expensive. Must be going mad... I still think £19 is a bit steep (although the best price out there!) but I'm unlikely to find anything equivalent. Looks like I'll place an o...
Posted by WobblyGoblin on 02/04/2014 - 13:48
In defence of the DA* 16-50
OTOH is it unreasonable to expect a £800+ lens to be sharp to the edges?:shock: Roger 99% of zooms are soft on the edges wide open, it's just how zooms are. As john says stopped down a little and the sharpness gets better. Zooms are very technical in design and compromises have to be made particu...
Posted by cabstar on 03/04/2014 - 18:24
DA31 Ltd on FF samples and 100% crops
If it's the A7r, the adapter is like an extension tube (no glass) which just puts the lens in the correct position relative to the sensor (i.e. same distance as it would be on a Pentax DSLR). Therefore no change to the focal length.
Posted by Pentaxophile on 11/04/2014 - 10:37
what two lenses to take to towns near the french alps?
I'd simply take the 18-55, stop it down a bit and you should be fine. WR will be useful during those Alpine storms. Less weight to carry up those mountains; less expensive gear to have to keep an eye on; no dirt getting onto your sensor. People are a bit sniffy about kit lenses and can't wait...
Posted by bwlchmawr on 02/05/2014 - 19:43
what two lenses to take to towns near the french alps?
Some very useful info here, thanks... A lot to think about Less weight to carry up those mountains; less expensive gear to have to keep an eye on; no dirt getting onto your sensor. Personally, if I ever had the chance to travel to someplace like this, I'd be taking everything, and probably inves...
Posted by Conqueror on 02/05/2014 - 20:24
Cleaning lenses/filters
Last weekend I decided to give my lens filter a good clean. I gave it a blow with my bulb blower and then after a little breath I gave it a gentle wipe with a micro fibre cloth. Looked spotless but just to make sure I shone my bright penlight across the surface just so and low and behold there was...
Posted by kiwao on 02/05/2014 - 06:46
Cleaning lenses/filters
Sometimes its not worth it to be so precious with these things! Most dust won't have any effect at all on whats recorded by the sensor. Smudges like greasy fingerprints are a problem though, but I'd rather be careful and be prepared to clean the lens front element if needed rather than stick a filte...
Posted by McGregNi on 02/05/2014 - 09:35
Cleaning lenses/filters
Yeah, ditto to what McGregNi said. I have about 50 lenses, don't have a filter on any and only clean if they look dirty. I store them in ziplock bags when not using, never had a problem with any.
Posted by nass on 02/05/2014 - 10:39
Cleaning lenses/filters
A few years ago I bought a Sigma 70-200mm f2.8 off Ebay (now owned by another forum member) and it came with a Hoya pro filter attached. I tested the lens and just couldn't get decent results from it, sometimes it refused to lock focus and when it did the pictures were no better than my kit 55-200mm...
Posted by Mike-P on 02/05/2014 - 10:50
