Search results for 'sensor cleaning' - page 173
Help! SMC Pentax-A 400mm f/5.6 showing signs of fungus
Checking lens today prior to packing for a trip to the Norfolk coast when I observed definite signs of a fungal infection (5-6 germinated spores on internal elements; can't tell precisely which). Would appreciate members thoughts on the following possible courses of action bearing in mind that I'm d...
Posted by prsjnb on 28/01/2022 - 20:33
Help! SMC Pentax-A 400mm f/5.6 showing signs of fungus
Thanks to you both, Paul and Kris, but neither of the parties mentioned are willing to take on the challenge :roll: Since last posting I have removed the visible fungus from the outer surface of the rear element and irradiated the lens interior with short-wave UV light in order to inhibit/prevent...
Posted by prsjnb on 14/02/2022 - 12:25
Good prime lens choice for catching toddler action shots
A fast standard lens should do the trick. On a crop sensor camera the 35mm f/2.4 is inexpensive and excellent. On full frame a 43mm or 50mm would be the equivalent. Probably the 50mm f/1.4 (not the new mega-expensive version) would be the most cost effective, but the 50mm f/2.8 macro lens could be a...
Posted by johnriley on 09/03/2022 - 00:47
That good old topic - the 3 lens selection
Over the years we've seen many discussions on the "perfect" 3 lens set up - often based around what you would take with you on a walk/trip/event. The conclusion is of course that the set-up depends on may factors, and I suspect if you're anything like me you will almost always find that another lens...
Posted by LennyBloke on 31/05/2022 - 13:24
That good old topic - the 3 lens selection
I just saw this thread for the 1st time and it‘s interesting to read about everyone‘s preferences. I‘ve gone with three sets of three to cover my usual activities. For general walkabouts with my K5iis I‘d go with: Pentax DA 16-45mm Samsung 35mm/f2 S-M-C Takumar 120mm/f2.8 The 16-45mm has ...
Posted by RichardC on 31/12/2022 - 07:19
Lens Upgrade
I've had wonderful results from my K5 and 55-300WR. You ought to find one on E bay at a reasonable price. I don't think you will find a better combination in a zoom for a crop sensor.
Posted by davidwozhere on 06/06/2022 - 00:09
Raynox and SR
How would a close-up add-on lens change a lens's focal length? Adding any elements or distance between existing lens and focal plane can certainly change a lenses FL. The latter is defined as "the distance between the optical centre of a lens and the capture medium (film or sensor). What surpri...
Posted by pschlute on 12/04/2023 - 19:32
Raynox and SR
Adding any elements or distance between existing lens and focal plane can certainly change a lenses FL. The latter is defined as "the distance between the optical centre of a lens and the capture medium (film or sensor). That definition of a FL is only true if the image is actually in focus. The way...
Posted by Lubbyman on 12/04/2023 - 21:05
Raynox and SR
How would a close-up add-on lens change a lens's focal length? Adding any elements or distance between existing lens and focal plane can certainly change a lenses FL. The latter is defined as "the distance between the optical centre of a lens and the capture medium (film or sensor). What surpri...
Posted by petrochemist on 15/04/2023 - 11:29
K5iis and 2.8 lenses
Hello Odd question. I have read that my k5iis has a 'linear flux' central focusing point. I have been using a Pentax 16-45 as the Sigma 17-70 (HSM 2nd version without OS) seemed to miss a lot. Recently used a blower brush in the mirror box and tried using the Sigma. It now has a great hi...
Posted by Simonmac on 23/05/2023 - 09:42
K5iis and 2.8 lenses
Muck on the AF sensor could well have been responsible for AF problems. Never had the problem myself (so far and touching wood...) but have read accounts by folk who have (e.g. ). You mentioning the 16-45mm has made me remember how much I used to use that lens and how much I liked the results. T...
Posted by Lubbyman on 23/05/2023 - 15:46
Fungus
I’ve just had to dispose of two lenses due to fungus, both have been replaced. My other lenses look ok. My question is, as they have been stored in a camera bag, should I give the bag a thorough clean. If so what type of cleaning solution is best.
Posted by Ratcatcher on 25/08/2023 - 08:23
Fungus
I'm not sure how you could clean it to a level that would provide full confidence - is it an expensive bag? Could replacing the bag be an option? Probably, unless a good cleaning solution will do the job.
Posted by Ratcatcher on 25/08/2023 - 09:51
Trying Out a Cosina 20mm f3.8
And don't forget that the K5, being a crop sensor camera, won't be using the outer part of the image circle where the lens is likely to be weakest. I've got a Cosina 24mm from the film era and it's better than might be expected on crop sensor cameras. Steve
Posted by Lubbyman on 21/05/2024 - 22:12
What can I expect from a K-1 and legacy lenses?
Hello all I'm a long-time member but not been on here for a while and looking for your wisdom and advice. I have a modest collection of legacy lenses from my early days in film photography. My favourites of the bunch are a 43mm ltd, a 50mm f1.2A and a Tamron 90mm macro lens. The 50mm in particula...
Posted by AdrianP on 03/11/2024 - 18:16
What can I expect from a K-1 and legacy lenses?
Wouldn't worry about it too much, the legacy lens perform great on the K1, particularly primes and a select few zooms from the A series. Yes the sensor out resolves the lens, as I have read so many times but not as much as one would think as to interfere with the final image after post processing ...
Posted by Flan on 03/11/2024 - 20:51
Filter cleaning
Greetings, I recently purchased a second hand Hoya HMC UV filter from eBay. The filter arrived with what I would describe as a slight haze and generally needed cleaning. So I used a cleaning “swab” which is used for the cleaning of spectacles. The result was a clean filter. My question is, will thi...
Posted by oasis on 22/01/2025 - 16:07
Filter cleaning
Most spectacle cleaning swabs and wipes are designed to be effective on coated lens and not impact on their effectiveness - I can't give you a guarantee but I'm pretty certain that if the filter looks clean and is not smeary then it will perform as it was meant to :smile:
Posted by LennyBloke on 22/01/2025 - 16:58
Filter cleaning
My spectacles have coatings which do the same job as coatings on filters and lenses. I use the same specialist cleaners to clean bothspectacles and camera lenses and filters. No harm appears to have been done to any of them. In fact, the lens cleaning fluid I use if something is really greasy explic...
Posted by Lubbyman on 22/01/2025 - 17:34
Filter cleaning
I would suggest a blower brush to clear any large particles/dust and then either a disposable lens cleaner (Zeiss seem to be the best of the ones I have used) or a spray cleaner and microfibre cloth, in which case spray onto the cloth and then clean the glass. I have had one or two filters with what...
Posted by smc on 22/01/2025 - 17:46
