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01-26-2021, 02:40 PM   #31
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Extension tubes as far - as I understand it - donít technically change focal length. Tc and macro lenses added to the front both do, but I get your point. The hd da tc alters reported focal length as well. It gets weird.

On the other hand adding a tc to a telephoto lens is not very uncommon and is a legit way to get to 250mm. I would rather see actual combined focal length used with tc since it is a common practice. It wonít affect me likely but it might others.

However whatever the rules end up thatís what we will do.

01-26-2021, 03:20 PM   #32
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QuoteOriginally posted by UncleVanya Quote
I would rather see actual combined focal length used with tc since it is a common practice. It won’t affect me likely but it might others.
That's what I would support as well - a lens with a TC is a new optical system, sometimes with fairly different character. It doesn't really matter though.
01-26-2021, 04:12 PM - 1 Like   #33
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From what I gather, TC use won't be an issue until October or possibly not even until November. So until then, lets leave it as an open question and I'll make a final ruling closer to the time (but still with plenty of time for folks to take new pictures)
01-26-2021, 05:37 PM   #34
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QuoteOriginally posted by MSL Quote
From what I gather, TC use won't be an issue until October or possibly not even until November. So until then, lets leave it as an open question and I'll make a final ruling closer to the time (but still with plenty of time for folks to take new pictures)
it should probably be the same ruling for macro tubes and close up lenses which both can alter the characteristics. Reversing the lens would also be in this conversation. These options could come earlier

01-26-2021, 05:52 PM - 1 Like   #35
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QuoteOriginally posted by Sidney Porter Quote
it should probably be the same ruling for macro tubes and close up lenses which both can alter the characteristics. Reversing the lens would also be in this conversation. These options could come earlier
Neither extension tubes nor reversing a lens add any glass to the setup. So I have no problem with either - they are simply ways to exploit the characteristics of the lens. However a TC or the addition of close up filters does add glass to the setup and thus in my view, change the setup so it is no longer a reflection of just the lens. So I would exclude them at this point, but I'm open to a continued discussion.
01-26-2021, 06:25 PM   #36
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QuoteOriginally posted by MSL Quote
Neither extension tubes nor reversing a lens add any glass to the setup. So I have no problem with either - they are simply ways to exploit the characteristics of the lens. However a TC or the addition of close up filters does add glass to the setup and thus in my view, change the setup so it is no longer a reflection of just the lens. So I would exclude them at this point, but I'm open to a continued discussion.
that seems like a reasonable solution and it's your comp
01-26-2021, 06:35 PM   #37
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QuoteOriginally posted by Sidney Porter Quote
that seems like a reasonable solution and it's your comp
Definitely trying to be reasonable.

Never thought of this as my comp. It was an idea I had that Adam has encouraged that I hope to make something this community finds of value.
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