300mm plus Lens Club: discuss your long lenses

Wasp · 08-18-2019, 01:23 PM - **8 Likes**

To see just how shallow I can make the depth of field, I took this with my A 400mm f/5.6 plus extension tube.

5shot · 08-18-2019, 07:14 PM - **1 Like**

Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

**luftfluss** · 08-18-2019, 10:01 PM - **2 Likes**

Originally posted by 5shot

Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

Do you mean the O-ME53? I have one installed on my K-3 II and K-70. It's helpful for manual focusing, although (for me) it makes it difficult to see the edges of the frame while looking through the OVF.

**luftfluss** · 08-18-2019, 10:02 PM

Originally posted by Wasp

To see just how shallow I can make the depth of field, I took this with my A 400mm f/5.6 plus extension tube.

Nice! I've been thinking about trying my A400 with the PENTAX Helicoid Extension Tube K

5shot · 08-19-2019, 09:59 AM

Originally posted by luftfluss

Nice variety! I hope the critters will be willing subjects for you.

Here's a few of my local critters shot with the K 500/4.5. The deer and hawk were @ f/5.6, the fox @ f/6.7, the squirrel wide open.

Do you happen to have a Lens Correction profile for this lens for Light Room?

**luftfluss** · 08-19-2019, 10:35 AM

Originally posted by 5shot

Do you happen to have a Lens Correction profile for this lens for Light Room?

I don't think anybody ever came up with one.

The CA can be really... vicious.

5shot · 08-19-2019, 02:30 PM

Yes it can!

**aslyfox** · 08-19-2019, 02:36 PM - **1 Like**

Originally posted by 5shot

Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

Originally posted by luftfluss

Do you mean the O-ME53? I have one installed on my K-3 II and K-70. It's helpful for manual focusing, although (for me) it makes it difficult to see the edges of the frame while looking through the OVF.

PENTAX Magnifier Eyecup O-ME53 reviews - Pentax Camera Accessory Review Database

I like the one I have on my K 3 and K 3 II

**WPRESTO** · 08-19-2019, 04:06 PM - **1 Like**

Originally posted by 5shot

Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

I started with an Asahi Pentax S. The original Spotmatic microprism screen was, IMHO, about the easiest/best manual focusing system. When I got a Pentax LX ASAP I replaced the doughnut + split-image screen for an all-microprism center. The only modern DSLRs that are as good for manual focusing for me are my current MFT bodies, especially my Olympus EM10 mk II. The focus-peaking assist visible through the viewfinder is exceptionally easy to use.

jcdoss · 08-20-2019, 08:00 AM

Originally posted by 5shot

Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

Yes, it has helped me a lot, particularly with fast lenses. Some other things that help is to do a DOF preview if you're stopping down, and to use the EVF if possible. I occasionally wish for a hybrid-type EVF because although the magnifier helps, it isn't the complete solution.

**Weevil** · 08-20-2019, 09:06 AM - **8 Likes**

Hi 300m members !

I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work!

This is an example of a "missed" photo that has captured a special moment: An underwing that is having a pee in flight!

Sphinx colibri en train de faire pipi en vol / Hummingbird clearwing Having a Pee in Flight [Hemaris thsybe]

I never heard or saw anything like that that before now!

I guess that is because they eat so much nectar, that they would become too heavy, or would "explode" if the excess of water is not evacuated?
I did a search on the Net and I found a link** about that phenomen for the bees. So, that would not be "urine" they eject, but they are rather "voiding water"...
If you have any other interesting reference about that, do not hesitate to share them!

-----
**No Privacy: Photograph Captures Bee Peeing Mid-Flight - Geekologie
Extract:
"Bees excrete ammonia and uric acid from their Malphigian tubules (insect version of kidneys). It ends up looking more like bird guano than a liquid stream like this. It is sort of dry and can vary in color from white to yellow.

What you are seeing in this photo is a bee voiding water. Voiding water is common in Bumble bees and honey bees as they have a high metabolic water production. Nectar has a high water content which not only provides the sugar necessary for activity but also an excess of water. This excess water needs to be removed in order to maintain a balanced water budget.

It's not urine, so it's not peeing. It's just water."

**Canada_Rockies** · 08-20-2019, 09:19 AM

Originally posted by Weevil

Hi 300m members !

I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work!

This is an example of a "missed" photo that has captured a special moment: An underwing that is having a pee in flight!

I never heard or saw anything like that that before now!

I guess that is because they eat so much nectar, that they would become too heavy, or would "explode" if the excess of water is not evacuated?
I did a search on the Net and I found a link** about that phenomen for the bees. So, that would not be "urine" they eject, but they are rather "voiding water"...
If you have any other interesting reference about that, do not hesitate to share them!

-----
**No Privacy: Photograph Captures Bee Peeing Mid-Flight - Geekologie
Extract:
"Bees excrete ammonia and uric acid from their Malphigian tubules (insect version of kidneys). It ends up looking more like bird guano than a liquid stream like this. It is sort of dry and can vary in color from white to yellow.

What you are seeing in this photo is a bee voiding water. Voiding water is common in Bumble bees and honey bees as they have a high metabolic water production. Nectar has a high water content which not only provides the sugar necessary for activity but also an excess of water. This excess water needs to be removed in order to maintain a balanced water budget.

It's not urine, so it's not peeing. It's just water."

Fascinating!

**aslyfox** · 08-20-2019, 12:39 PM - **1 Like**

Red-billed teal Anas erythrorhyncha in the Serengeti

Red-billed Teal or Duck

**Des** · 08-20-2019, 03:05 PM

Originally posted by Weevil

I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work!

If we had a Hall of Fame for this thread, you'd be in the first round of inductees, Weevil. Four of the most-liked posts in the top 20, including the all-time #1, which is one of the best images ever posted on this Forum. Great to hear from you.

**luftfluss** · 08-20-2019, 08:26 PM - **3 Likes**

Originally posted by 5shot

Yes it can!

Unfortunately, the only way I know of to somewhat mitigate the CA is to work on it manually. Sometimes I have to mask certain areas of the photo because I don't want removing CA to damage the subject. This is what I did in the squirrel photo I posted earlier, but I also did not remove some of the CA because removing it proved too destructive.

You can see there is still plenty of the cyan CA remaining, but IMO it doesn't impact the aesthetic of the photo, so I left it alone.

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08-18-2019, 01:23 PM - 8 Likes	#31546
Wasp Pentaxian Join Date: Mar 2017 Location: Pretoria Photos: Gallery Posts: 4,659	To see just how shallow I can make the depth of field, I took this with my A 400mm f/5.6 plus extension tube.

08-18-2019, 07:14 PM - 1 Like	#31547
5shot Senior Member Join Date: Feb 2009 Location: Washington - the State Posts: 208	Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope.

08-18-2019, 10:01 PM - 2 Likes	#31548
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,618	Originally posted by 5shot Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope. Do you mean the O-ME53? I have one installed on my K-3 II and K-70. It's helpful for manual focusing, although (for me) it makes it difficult to see the edges of the frame while looking through the OVF.

08-18-2019, 10:02 PM	#31549
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,618	Originally posted by Wasp To see just how shallow I can make the depth of field, I took this with my A 400mm f/5.6 plus extension tube. Nice! I've been thinking about trying my A400 with the PENTAX Helicoid Extension Tube K

08-19-2019, 09:59 AM	#31550
5shot Senior Member Join Date: Feb 2009 Location: Washington - the State Posts: 208	Originally posted by luftfluss Nice variety! I hope the critters will be willing subjects for you. Here's a few of my local critters shot with the K 500/4.5. The deer and hawk were @ f/5.6, the fox @ f/6.7, the squirrel wide open. Do you happen to have a Lens Correction profile for this lens for Light Room?

08-19-2019, 10:35 AM	#31551
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,618	Originally posted by 5shot Do you happen to have a Lens Correction profile for this lens for Light Room? I don't think anybody ever came up with one. The CA can be really... vicious.

08-19-2019, 02:30 PM	#31552
5shot Senior Member Join Date: Feb 2009 Location: Washington - the State Posts: 208	Yes it can!

08-19-2019, 02:36 PM - 1 Like	#31553
aslyfox Seeker of Knowledge Join Date: Aug 2016 Location: Topeka, Kansas Photos: Gallery \| Albums Posts: 24,581	Originally posted by 5shot Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope. Originally posted by luftfluss Do you mean the O-ME53? I have one installed on my K-3 II and K-70. It's helpful for manual focusing, although (for me) it makes it difficult to see the edges of the frame while looking through the OVF. PENTAX Magnifier Eyecup O-ME53 reviews - Pentax Camera Accessory Review Database I like the one I have on my K 3 and K 3 II

08-19-2019, 04:06 PM - 1 Like	#31554
WPRESTO Loyal Site Supporter Join Date: Aug 2010 Location: Massachusetts Photos: Gallery \| Albums Posts: 59,103	Originally posted by 5shot Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope. I started with an Asahi Pentax S. The original Spotmatic microprism screen was, IMHO, about the easiest/best manual focusing system. When I got a Pentax LX ASAP I replaced the doughnut + split-image screen for an all-microprism center. The only modern DSLRs that are as good for manual focusing for me are my current MFT bodies, especially my Olympus EM10 mk II. The focus-peaking assist visible through the viewfinder is exceptionally easy to use.

08-20-2019, 08:00 AM	#31555
jcdoss Pentaxian Join Date: Nov 2012 Location: Ingelheim am Rhein, Germany Photos: Gallery \| Albums Posts: 6,760	Originally posted by 5shot Does a Viewfinder Magnifier help at all? I started many years ago with my dad's old Spotmatic, so I'm not unfamiliar with manual focus, and I also do a lot of glassing with binoculars and a spotting scope. Yes, it has helped me a lot, particularly with fast lenses. Some other things that help is to do a DOF preview if you're stopping down, and to use the EVF if possible. I occasionally wish for a hybrid-type EVF because although the magnifier helps, it isn't the complete solution.

08-20-2019, 09:06 AM - 8 Likes	#31556
Weevil Site Supporter Join Date: May 2012 Location: Near Montréal, Québec Photos: Gallery Posts: 4,439	Hi 300m members ! I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work! This is an example of a "missed" photo that has captured a special moment: An underwing that is having a pee in flight! Sphinx colibri en train de faire pipi en vol / Hummingbird clearwing Having a Pee in Flight [Hemaris thsybe] I never heard or saw anything like that that before now! I guess that is because they eat so much nectar, that they would become too heavy, or would "explode" if the excess of water is not evacuated? I did a search on the Net and I found a link about that phenomen for the bees. So, that would not be "urine" they eject, but they are rather "voiding water"... If you have any other interesting reference about that, do not hesitate to share them! ----- No Privacy: Photograph Captures Bee Peeing Mid-Flight - Geekologie Extract: "Bees excrete ammonia and uric acid from their Malphigian tubules (insect version of kidneys). It ends up looking more like bird guano than a liquid stream like this. It is sort of dry and can vary in color from white to yellow. What you are seeing in this photo is a bee voiding water. Voiding water is common in Bumble bees and honey bees as they have a high metabolic water production. Nectar has a high water content which not only provides the sugar necessary for activity but also an excess of water. This excess water needs to be removed in order to maintain a balanced water budget. It's not urine, so it's not peeing. It's just water."

08-20-2019, 09:19 AM	#31557
Canada_Rockies Loyal Site Supporter Join Date: Nov 2007 Location: Sparwood, BC, Canada Photos: Gallery \| Albums Posts: 12,385	Originally posted by Weevil Hi 300m members ! I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work! This is an example of a "missed" photo that has captured a special moment: An underwing that is having a pee in flight! I never heard or saw anything like that that before now! I guess that is because they eat so much nectar, that they would become too heavy, or would "explode" if the excess of water is not evacuated? I did a search on the Net and I found a link about that phenomen for the bees. So, that would not be "urine" they eject, but they are rather "voiding water"... If you have any other interesting reference about that, do not hesitate to share them! ----- No Privacy: Photograph Captures Bee Peeing Mid-Flight - Geekologie Extract: "Bees excrete ammonia and uric acid from their Malphigian tubules (insect version of kidneys). It ends up looking more like bird guano than a liquid stream like this. It is sort of dry and can vary in color from white to yellow. What you are seeing in this photo is a bee voiding water. Voiding water is common in Bumble bees and honey bees as they have a high metabolic water production. Nectar has a high water content which not only provides the sugar necessary for activity but also an excess of water. This excess water needs to be removed in order to maintain a balanced water budget. It's not urine, so it's not peeing. It's just water." Fascinating!

08-20-2019, 03:05 PM	#31559
Des Loyal Site Supporter Join Date: Jan 2014 Location: Victoria Australia Photos: Albums Posts: 6,422	Originally posted by Weevil I am not very active nowadays, but always appreciate all the posts here and in PF threads... nice work! If we had a Hall of Fame for this thread, you'd be in the first round of inductees, Weevil. Four of the most-liked posts in the top 20, including the all-time #1, which is one of the best images ever posted on this Forum. Great to hear from you.

08-20-2019, 08:26 PM - 3 Likes	#31560
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,618	Originally posted by 5shot Yes it can! Unfortunately, the only way I know of to somewhat mitigate the CA is to work on it manually. Sometimes I have to mask certain areas of the photo because I don't want removing CA to damage the subject. This is what I did in the squirrel photo I posted earlier, but I also did not remove some of the CA because removing it proved too destructive. You can see there is still plenty of the cyan CA remaining, but IMO it doesn't impact the aesthetic of the photo, so I left it alone.

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