Posted: Sat Aug 29, 2020 2:58 am Post subject: using ND filters in Topcor RE lenses in a Sony A7Rii |
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migue7 wrote:
Hi: I have been reading your forums and notice that there is a lot of photographers here with knowledge that may be able to help me. I have a set of Topcor lenses that I use in my Sony A7Rii with an adapter, I need help, when I use my ND F-pro B+W filter I always get and arch reflection on the bottom left of the photo . The funny thing is that it only happens with my Topcor lenses the 58mm f1.8 RE and 35mm f2.8 {I also have the 100mm 2.8 and the 135mm 3.5 but I don't use ND filters on those} it does't happen with my 20mm f4 nikkor and 28mm f2.8 nikkor both ai manual focus lenses.
I love the quality of my Topcor lenses but i do a lot of nature and landscape photography and when I do seascapes and water falls i like to take long exposures that requires the use of ND filters.
My Nikkors are very good performers but my Topcor lenses are just the best I have try on my Sony,( I have been trying different lenses on my Sony for 2 years and finally decide that the Topcors are the best for my camera) I have try Canon FD, Minolta, Vivitar, Sigma and Mamiya/Sekor. But I have to tell you my 58mm 1.8 and my 100mm 2.8 Topcor are the best, very sharp, NO CA and at the same time have a 3 dimensional look. I also use with adapters Hassleblad C lenses (that I have from my portrait photography background) and Carl Ziess Jena lenses for my artistic vintage look.
I have been a Photographer for over 40 years and has never encounter something like this, If any one had this situation before please share it with me.
Thanks
I have been thinking of maybe getting a different brand of ND filters to see if it there is some kind of incompatibility with the Topcors.
I will include a sample photo I took in my neighborhood to show the reflection, some times is a lot bigger than this but I always get the reflection on my RE Topcor lenses. {please don't judge the lens by these photo because I am just trying to recreate the problem, but normally I would not use a 30 seconds exposure on a windy day like this with an ND filter} I also included a crop of the affected area.
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"Update" No one has answered my question, but I think i may have figure it out, I try some test photos with my 77mm ND B+W filter using a reduction ring and it does not show the reflection that I get when using my 58mm ND filter. I still heve to do more testing. Will keep you updated. |