Re: Pentax A 35-105mm F/3.5 Macro Zoom
Thanks Bill That’s interesting. I’m sure I had the Tokina 28-70 2.8/2.8 at some point in the past, but memory starts to get hazy. In the end I found a ‘spares or repair’ Nikkor AF-S 28-70/2.8 going cheap at a very good used gear retailer in London called MPB.com - I’ve used them before when buying high value broadcast equipment. The lens basically ‘wouldn’t focus past the 2m mark’. These AF-S lenses suffer similar problems with AF motors conking out, apparently. I’ve had my 17-35/2.8 apart in the past so ordered this one for 135GBP. I took it apart yesterday and sure enough, bingo. What happens is that the inner workings of the lens (eg the solid surrounding polycarbonate holding the lens groups in place) is surrounded by a hexagonal-shaped piece if thin aluminium which sits in between it and the outer metal surrounding lens casing that carries the zoom and focus rings. On both sides of the thin aluminium is glued various printed circuitry all the way around - and there’s plenty of it. Over time and handling, some of the glue starts to weaken and occasionally a wayward edge of plastic film type circuitry comes away from the aluminium - just enough to interfere with the spinning AF inner ring - actually it’s the bit you can see through the little ‘window’ on the exterior of the lens, displaying focal distances. This is similar on many lenses, including Pentax I believe. Of course, the more the bit of circuitry becomes interference fit, the more it interferes, until it basically gets caught and stops the AF motor being able to push this inner ring around and achieving focus. I’ve seen fixes on Youtube (search user ‘mikeno62’) where the glue on the weak bit is replaced. In my case, I just ripped all the circuitry out and tossed it in the bin!! I don’t need no stinking AF. Also de-clicked the aperture ring - one of the main reasons I sought this lens and one like it - manual aperture control. Plus the glass is uber sharp, great for HD video wide open. Probably more than you were expecting here :-) As you were Cot On 10 Jan 2023, at 22:31, Bill wrote: I had the Tokina for a while. It was plenty sharp enough even wide open, but I was into shooting environmental portraits at the time and it had just enough barrel distortion to be upsetting, so I let it go. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
On 1/10/2023 12:23 PM, coll...@brendemuehl.net wrote: Steve Cottrell wrote: Hi all Does anyone on the list have experience with the Pentax A 35-105/3.5 zoom lens? I’m looking for something this range for video work. Has to be sharp in the middle wide open, not bothered at the corners. TIA Cotty The Tokina of the same vintage is quite sharp in the center, though I never shot it wide open. Might be worth a look if one is available. I had the Tokina for a while. It was plenty sharp enough even wide open, but I was into shooting environmental portraits at the time and it had just enough barrel distortion to be upsetting, so I let it go. bill -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Thanks Collin, By chance I actually came across a ‘parts or spares and repair’ example of a Nikkor AF-S 28-70/2.8 which, when I enquired, was told that it would not autofocus (I only need manual focus and aperture). I know something of these lenses as I have the 17-35/2.8 and have already had that apart to adapt it for video use. So for 130GBP I have a lens that goes for betwen 3 tp 6 times that depending on condition. It’s a stellar perfomer apparently which is what I need for HD video. Tweakers and drivers at the ready! Cheers Cot On 10 Jan 2023, at 18:23, coll...@brendemuehl.net wrote: The Tokina of the same vintage is quite sharp in the center, though I never shot it wide open. Might be worth a look if one is available. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Steve Cottrell wrote: > Hi all > > Does anyone on the list have experience with the Pentax A 35-105/3.5 zoom > lens? I’m looking for something this range for video work. Has to be sharp in > the middle wide open, not bothered at the corners. > > TIA > > Cotty The Tokina of the same vintage is quite sharp in the center, though I never shot it wide open. Might be worth a look if one is available. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Am 08.01.23 um 21:40 schrieb Steve Cottrell: Shame as that range would be quite useful. Pity really, as it's a great lens. Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Hi all I’ve now found out that the front end of this lens rotates :-( Unfortunately that’s a deal-breaker for me as I need a non-rotating lens. I attach a matte box to an adapter that screws into the filter thread on the front of the lens and clearly it woud rotate as well in use. Shame as that range would be quite useful. I could opt for some of the other mid-range zooms with an aperture ring, will have a think on it. Cot On 8 Jan 2023, at 13:00, Steve Cottrell wrote: Does anyone on the list have experience with the Pentax A 35-105/3.5 zoom lens? I’m looking for something this range for video work. Has to be sharp in the middle wide open, not bothered at the corners. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Am 08.01.23 um 15:06 schrieb Steve Cottrell: Thanks Ralf, that’s useful to know. Did the front of the 28-135 rotate by any chance? Yes, the front rotates. Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Thanks Ralf, that’s useful to know. Did the front of the 28-135 rotate by any chance? Cot On 8 Jan 2023, at 13:33, Ralf R Radermacher wrote: I've had the SMC-A 4/28-135 mm and it was an excellent lens, albeit at 820 g a bit on the heavy side. Optically superb and built like the proverbial battleship. https://www.fotocommunity.de/photo/eins-zwei-polizei-fotoralfbe/46873867 http://kmp.pentaxians.eu/lenses/short/a28-135f4/ Ralf -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Pentax A 35-105mm F/3.5 Macro Zoom
Am 08.01.23 um 14:00 schrieb Steve Cottrell: Does anyone on the list have experience with the Pentax A 35-105/3.5 zoom lens? I’m looking for something this range for video work. Has to be sharp in the middle wide open, not bothered at the corners. I've had the SMC-A 4/28-135 mm and it was an excellent lens, albeit at 820 g a bit on the heavy side. Optically superb and built like the proverbial battleship. https://www.fotocommunity.de/photo/eins-zwei-polizei-fotoralfbe/46873867 http://kmp.pentaxians.eu/lenses/short/a28-135f4/ Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Pentax A 35-105mm F/3.5 Macro Zoom
Hi all Does anyone on the list have experience with the Pentax A 35-105/3.5 zoom lens? I’m looking for something this range for video work. Has to be sharp in the middle wide open, not bothered at the corners. TIA Cotty -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
