Search results for 'sensor cleaning' - page 91
Pentax Fit 2x Converter
I don't know this, but it's probably worth a punt for around £20.00. Tamron lenses are usually quite good. G It was over £50 when I looked :cry: Still worth a punt? I don't know. This seems to be a three horse race between somebody who can't spell Prometheus and who has no idea how Ebay biddin...
Posted by George Lazarette on 18/04/2007 - 20:11
Macro-Sharpness:Pentax DFA 50mm vs 100mm vs Sigma/Tamron.
I want my ultimate macro lens hehe you are right ... When I originally made this thread ( before 8 months or so ) I just wanted up to 1:1 magnification . So I was looking for either a 100mm or a 50mm . I thought 1:1 would give greater magnification than my old PnS cam . So I bought a 50mm DFA beca...
Posted by mer on 21/12/2007 - 16:25
Dogs with the 135mm f2.5 SMC Takumar
It's not an extreme crop, especially for a distant subject. But your 6 MP is now only 1.5 MP - not even as good as a lot of mobile phones. now don't be discounting the effect of lens and sensor quality here. I was at a Hockey game when I was in Canada and they didn't like me using my big tele len...
Posted by Mongoose on 14/05/2007 - 14:02
SMC-FA 50mm f/1.4 versus SMC-FA/F 50mm f/2.8 macro
A flashgun with a omnibounce would help a lot to get more light on the sensor. When doing a portrait indoor (actually on most of my indoor shots) I allways use a flash with omnibounce. You might need to boost the exposure by 1 to 1,5 stops or so when using the omnibounce.
Posted by golfdiesel on 20/05/2007 - 19:20
FA-50 1.4
Also just saw that there is a DA* 55 1.4 on its way which looks to be rather good: SDM, weather sealed, large front element (a guess). But that would be much bigger and heavier than the FA 50. Can't see why it would be bigger and heavier than the FA 50 f/1.4. Same focal length and same max aperture....
Posted by ZaphodB on 01/06/2007 - 16:24
FA-50 1.4
Can't see why it would be bigger and heavier than the FA 50 f/1.4. Same focal length and same max aperture. If anything I might expect it to be smaller, since it would presumably be designed for the smaller image circle of the sensor like the other DA lenses. Well, all the SDM lenses announced so fa...
Posted by Tyr on 01/06/2007 - 16:33
manual pre-set lens
I have been playing a little with a Orestor 2.8/135 in M42 mount. Allthough the lens needs cleaning on the inside (I have to find a company who does that here in the Netherlands) it works very nice. The beauty of this lens is that it is a pre-set lens, so there is no coupling between the body and...
Posted by golfdiesel on 05/06/2007 - 16:18
manual pre-set lens
they have a bit of a cult following, which is largely justified, at least if you get a good one. At reasonable working distances my Flek 35 resolves more detail than the 6MP sensor on my *istDL2 can pick up, even wide open. The K10D can discern some benefit from stopping down. The lens is also ab...
Posted by Mongoose on 08/06/2007 - 22:59
Pentax M-Lenses on Nikon DSLRS
I would have thought not, as once you've added an adaptor to fit the lens to the body, the lens would be too far from the sensor for you to achive infinity focus. And, I think if you took that route you'd have to be getting the D80 or D200 at least (the D40 has a funny mount I think, although it ...
Posted by Daniel Bridge on 09/06/2007 - 00:19
NEW Pentax DA 16-50 Lens Question
Very true. A print of equivalent size to the image viewed at 100% in Photoshop would be, well, large... I would consider the purple fringing in those images insignificant, with the exception of the line in number 4... and that one is easily fixed. We clone out the results of dust on the lens or s...
Posted by ZaphodB on 12/06/2007 - 01:48
Cleaning lenses
I need to clean the front element on one of my SMC Pentax lenses. It's not terribly dirty, just a few specks that aren't dust. But it'll need a little rubbing, and I don't want to risk the coating. Any tips? TIA
Posted by ChrisA on 16/06/2007 - 14:04
Cleaning lenses
For small stubborn specks: Breathe on lens then wipe with edge of lens pen tip: www.7dayshop.com/catalog/product_info.php?cPath=777_1&products_id=100769
Posted by iceblinker on 16/06/2007 - 14:15
Cleaning lenses
I believe that SMC coatings are far more durable than you might think. I once had a pair of spectacles with Pentax lens (totally brand loyal) that had a a reflection/glare reducing coating (not SMC I know). I used those glesses for over 5 years regularly, cleaning at least once a day, by breathi...
Posted by stevejcoe on 17/06/2007 - 04:44
Cleaning lenses
I believe that SMC coatings are far more durable than you might think. I once had a pair of spectacles with Pentax lens (totally brand loyal) that had a a reflection/glare reducing coating (not SMC I know). I used those glesses for over 5 years regularly, cleaning at least once a day, by breathi...
Posted by George Lazarette on 17/06/2007 - 07:59
Cleaning lenses
I clean lenses when necessary, not too often hopefully, by using the Pentax microfibre cloth. Flick off any specks, breath on glass, allow to evaporate and then wipe with cloth. It's worked well for me for a very long time with no signs of damage to the front elements of my lenses.
Posted by johnriley on 17/06/2007 - 09:29
Bellows adaptor
Hi, My twopennyworth... Often with bellows, one reverses the lens (eg a 50mm lens). My understanding is that this improves the quality of the optical path because a standard lens is designed to have a greater subject to lens distance than the lens to film/ sensor plane distance. So by reversing ...
Posted by alfpics on 29/06/2007 - 09:35
Safari Lens
I use the Sigma 135-400 on Safari all the time (3 or 4 times a year) with a tamron 18-200 for the evenings. I find that they handle the environment really well and with that range you are not changing lenses all the time so you can keep the dust out of the camera better. If you set the K10D to c...
Posted by Rodger Fooks on 12/07/2007 - 09:38
Safari Lens
Rodger I am so envious of you - safari 3-4 times a year wow. :shock: I am so looking forward to going again next year. My once in a lifetime trip is going to be at least a twice in a lifetime trip. Africa has worked it's way into my heart. When I win the lottery I will be of to Africa all the time...
Posted by Gwyn on 12/07/2007 - 10:09
Metering with 1.7X converter
Sorry it is a bit difficult to explain. What I meant was when I use Aperture Priority mode I can set the aperture to 2.8 on the camera but the lens is only a F4 lens. I was only using the ring on the lens to prove a point why do I get two different meter readings for F4 surely they should be the s...
Posted by George Lazarette on 14/07/2007 - 18:42
Metering with 1.7X converter
[quote:adceccde7d="mille19"]I have also noticed that in AV mode I can set the F to F2.8 but the lens is only a F4 if I take a shot at F2.8 the shots come out over exposed. Has anyone else had the same problems and has anyone any ideas why this could be happening? I've had the same issue using a P...
Posted by ChrisA on 15/07/2007 - 01:40
