Search results for 'sensor cleaning' - page 94
LBA Tamron 90mm Macro SP Di
I see what you mean :oops: Sensor has been cleaned. Used the modeling flash mode to look inside and there was a huge bit of dust clinging on. It took five wipes with my arctic butterfly to remove it!
Posted by Tyr on 27/11/2007 - 22:20
Lens sought : equivalent of my SMC-M 20mm/f4 for ist*D....
There are no affordable wide primes,......this has always been the problem. There is only the VERY expensive 14mm,...if you can find one as they are like the proverbial 'rocking horse sh*t'. The only practical game in town is the Sigma 10 - 20mm zoom which is considerably cheaper than any prime...
Posted by viewfinder on 26/11/2007 - 14:30
macro lens
I used to use a M auto bellows, combined with a 70 mm 2,8 lens. The problem for me was that the lowest magnification with the bellows was still to large and without the bewllows, the magnification was way too low. The problem is that the bellows themselves take up some space between lens and sensor....
Posted by drerka on 28/11/2007 - 08:11
K lens
Close the iris down to it's smallest aperture and check that there is no evidence of oil on the blades (check both sides). If you suspect lens surface contamination, clean it with lens cleaning tissues or cloth, slightly wetted with lens cleaning fluid. If you suspect the grease is on the inside yo...
Posted by Mannesty on 02/12/2007 - 19:26
K lens
Give any lens a good clean...and not just the glass ! Dont forget there is a a build up of 20 years of gunge on some of these old lenses, you dont want to introduce that to you shiny new digital sensor. The type of metering you use will make a difference, but as I understand it the A series len...
Posted by pschlute on 02/12/2007 - 19:27
K lens
. . . but the curve goes right up to the 'top' as it were and is quite a wide peak. No clipping anywhere. Mike, The above statements are contradictory. The histogram represents black level on the left and white level on the right. The bit in between represents all the colours between black and...
Posted by Mannesty on 02/12/2007 - 21:58
Building your own set of lenses in Pentax World
I have the KA50 f1.4, bought it as a student and never regretted it. I was also happy to find it performed excellently on the K10D and also allowed me to controll a slave flash by setting the camera on manual and selecting the apature from the ring to controll flash light. A bit hit and miss on th...
Posted by beakynet on 05/12/2007 - 13:40
Filters
Hi If you do a google search you will find plenty of sites which explain what filters do what. Lens protection.......... I reckon if you do a poll you will get a pretty balanced result. I personally dont use filters for lens protection. If I was taking an expensive lens onto a windy stormy be...
Posted by pschlute on 17/12/2007 - 15:00
Filters
Aren't they a bit like insurance,you hope younever have to claim, and you don't like paying for it , but you sure are grateful when something does go wrong. I must say I have only damaged one filter in 30 years, but my luck says as soon as I take them off I'll scratch a lens! So you see I've got my ...
Posted by pschlute on 17/12/2007 - 17:46
Filters
The two common filters that can't be replaced by software are the polariser and the UV/skylight filters. (I'm talking about colour, not monochrome.) These provide the sensor with more information, whilst other filters tend simply to change the colour balance or add those "special effects&qu...
Posted by George Lazarette on 21/12/2007 - 11:44
Filters
i wont get into the protection subject - each to his own. I use them (good quality ones only). Black & White tone modifying filters do not work on digital cameras for a number of reasons. I don't know them all but I can say that digital sensors are much more sensitive to red and green than bl...
Posted by Philip Taylor on 29/12/2007 - 12:03
Filters
IR filters are useful only if you remove the IR blocking filter from inside your camera (over the sensor) as sensors are (again) highly sensitive to red and IR. IR sensors certainly work with the *istDS.
Posted by niblue on 29/12/2007 - 12:12
Pentax 12-24
The price levels of the more exotic lenses hold up even better, and in future years the 12-24mm might well be one of more sought after lenses. I think that given the volatility and rate of progress in the digital camera market it'd be unwise to assume that any of the current APS-C sensor size lenses...
Posted by niblue on 05/01/2008 - 15:09
New Lens Arrives
What shutter speed? It's not as sharp as I'd hope for but it does depend on a steady camera! I have taken a very similar shot of a church porch and I can zoom in to read the notices on the noticeboard and the stonework jumped at me. Your shot also looks a little flat. My own theory for what it's ...
Posted by mikew on 23/01/2008 - 07:23
cheap macro (microscope!) lens order.
incidentally, for anyone considering messing around with their old lenses, the penny now looks like this (I think this is about 24x as the letters are roughly 1mm and they take up the whole sensor... is that right?) 65mm ext. tubes, tamron 70-300 at 300 f16 with the 28mm on f4 stuffed into the Tamm...
Posted by Darkmunk on 20/01/2008 - 12:23
cheap macro (microscope!) lens order.
Thats incredible.. I spent about 5minutes trying to find where IRB was on a penny, only by looking at the original pictures could I work it out, theyre so small! Sensor is like 24x15, so yeah, 24:1. Nice work :)
Posted by ikillrocknroll on 20/01/2008 - 15:07
cheap macro (microscope!) lens order.
You can clean the rear element of a lens just like the front element, with a cloth. I suppose, if you're worried about having dust fall off the rear of the lens onto the sensor, you can dust it with a blower before putting it on. Significant amounts of dust can't 'enter' a lens through normal ...
Posted by SilverJON on 20/01/2008 - 15:45
eBay Prices
Restoring the full KAF mount capability would be something that would persuade me to upgrade immediately. It could be a very good move for Pentax as I'm sure a lot of us would feel the same. Same here, full K mount compatibility would move the K20D right to the top of my wish list faster than any ot...
Posted by ChrisA on 21/01/2008 - 23:25
Please help with Pentax lenses acronyms …
D-FA is a digitally designed lens with an image circle suitable for 35mm film. Tha macro lenses fit this category. DA lenses are digital designs with an image circel suitable for APS-C sensors. Digital design implies improves coatings for the rear element to reduce reflections from the shiny s...
Posted by johnriley on 22/01/2008 - 22:04
Can you use digital lenses with film?
As I understand it, digital lenses are made to optimise light gathering on the area of the sensor. Since this is smaller than 35mm film, presumably there is less detail gathered. So, if you use digitally optimised lenses with film, are you losing out on detail and is this noticeable? Is it not...
Posted by liberatortoo on 24/01/2008 - 21:17
