Contest Something special about that lens - NEW CONTEST series

**UncleVanya** · 01-26-2021, 02:40 PM

Extension tubes as far - as I understand it - don’t 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 won’t affect me likely but it might others.

However whatever the rules end up that’s what we will do.

**JensE** · 01-26-2021, 03:20 PM

Originally posted by UncleVanya

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.

**MSL** · 01-26-2021, 04:12 PM - **1 Like**

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)

Sidney Porter · 01-26-2021, 05:37 PM

Originally posted by MSL

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

**MSL** · 01-26-2021, 05:52 PM - **1 Like**

Originally posted by Sidney Porter

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.

Sidney Porter · 01-26-2021, 06:25 PM

Originally posted by MSL

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

**MSL** · 01-26-2021, 06:35 PM

Originally posted by Sidney Porter

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.

Phyllis · 06-16-2021, 10:39 AM

Just to verify that I understand the rules correctly, a 50mm Macro lens is not eligible in this, correct?
And this can be any brand of 50mm lens?

**MSL** · 06-16-2021, 05:08 PM

Originally posted by Phyllis

Just to verify that I understand the rules correctly, a 50mm Macro lens is not eligible in this, correct?And this can be any brand of 50mm lens?

A 50mm Macro lens is fine for this round.
Any brand of lens is fine, as long as the photo was taken on a Pentax/Ricoh camera

Phyllis · 06-17-2021, 09:03 PM

Originally posted by MSL

A 50mm Macro lens is fine for this round.
Any brand of lens is fine, as long as the photo was taken on a Pentax/Ricoh camera

Ok thanks so much for clarifying this info. The forum is still kinda new to me as I don’t post often, mainly lurk and learn. To which there is such a vast amount of knowledge on here, it blows my mind and I can read for hours. I really enjoy it!

06-16-2021, 10:39 AM	#38
Phyllis Senior Member Join Date: Apr 2018 Location: Tennessee Photos: Albums Posts: 181	Just to verify that I understand the rules correctly, a 50mm Macro lens is not eligible in this, correct? And this can be any brand of 50mm lens? Last edited by Phyllis; 06-16-2021 at 11:49 AM. Reason: added another question; 2nd edit, clarification

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01-26-2021, 02:40 PM	#31
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,409	Extension tubes as far - as I understand it - don’t 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 won’t affect me likely but it might others. However whatever the rules end up that’s what we will do.

01-26-2021, 03:20 PM	#32
JensE Site Supporter Join Date: Dec 2015 Location: Leipzig Photos: Gallery \| Albums Posts: 1,969	Originally posted by UncleVanya 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
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,749 Original Poster	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
Sidney Porter Veteran Member Join Date: Feb 2012 Location: Columbus Ohio USA Posts: 353	Originally posted by MSL 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
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,749 Original Poster	Originally posted by Sidney Porter 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
Sidney Porter Veteran Member Join Date: Feb 2012 Location: Columbus Ohio USA Posts: 353	Originally posted by MSL 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
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,749 Original Poster	Originally posted by Sidney Porter 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.

06-16-2021, 05:08 PM	#39
MSL Site Supporter Join Date: Feb 2012 Location: Greater Toronto Area Photos: Gallery \| Albums Posts: 4,749 Original Poster	Originally posted by Phyllis Just to verify that I understand the rules correctly, a 50mm Macro lens is not eligible in this, correct?And this can be any brand of 50mm lens? A 50mm Macro lens is fine for this round. Any brand of lens is fine, as long as the photo was taken on a Pentax/Ricoh camera

06-17-2021, 09:03 PM	#40
Phyllis Senior Member Join Date: Apr 2018 Location: Tennessee Photos: Albums Posts: 181	Originally posted by MSL A 50mm Macro lens is fine for this round. Any brand of lens is fine, as long as the photo was taken on a Pentax/Ricoh camera Ok thanks so much for clarifying this info. The forum is still kinda new to me as I don’t post often, mainly lurk and learn. To which there is such a vast amount of knowledge on here, it blows my mind and I can read for hours. I really enjoy it!