Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-04-2022, 06:26 AM - 2 Likes   #1
Reboot before calling IT
Loyal Site Supporter
madison_wi_gal's Avatar

Join Date: Sep 2016
Location: Madison WI
Photos: Gallery | Albums
Posts: 502
LBA LBA LBA - Overlap

I thought it would be fun to look at my lenses and see the overlap in focal length. I think I use the 18-135 more than any other.

Quick and dirty with Excel.

Attached Images
 
06-04-2022, 06:46 AM - 11 Likes   #2
amateur dirt farmer
Loyal Site Supporter
pepperberry farm's Avatar

Join Date: Dec 2014
Location: probably out in a field somewhere...
Photos: Gallery | Albums
Posts: 33,427
that's the sort of data my wife would use to suggest selling everything but the one lens...

needless to say, I don't say such things in front of her....
06-04-2022, 06:50 AM - 1 Like   #3
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 23,084
QuoteOriginally posted by madison_wi_gal Quote
I thought it would be fun to look at my lenses and see the overlap in focal length. I think I use the 18-135 more than any other.

Quick and dirty with Excel.
This may exaggerate the scope of the lenses. You might try angle of view vs focal length to see if the charts look different. The scope of coverage of a 55-300 5.5x zoom should be less than the 18-135 7.5x zoom. Also at wider angles the differences 1mm makes is larger. Finally a fisheye covers more than a normal wide angle at the same focal length.

---------- Post added 06-04-22 at 09:51 AM ----------

You also may want to factor in aperture at focal length via color or other means.
06-04-2022, 07:07 AM - 1 Like   #4
Reboot before calling IT
Loyal Site Supporter
madison_wi_gal's Avatar

Join Date: Sep 2016
Location: Madison WI
Photos: Gallery | Albums
Posts: 502
Original Poster
QuoteOriginally posted by UncleVanya Quote
This may exaggerate the scope of the lenses. You might try angle of view vs focal length to see if the charts look different. The scope of coverage of a 55-300 5.5x zoom should be less than the 18-135 7.5x zoom. Also at wider angles the differences 1mm makes is larger. Finally a fisheye covers more than a normal wide angle at the same focal length.

---------- Post added 06-04-22 at 09:51 AM ----------

You also may want to factor in aperture at focal length via color or other means.
Ay! I am a geek but maybe not to this level. OK, I'm game for the angle of view calculation. My lenses are on the Pentax forum site (example 18-135 is (Diag. / Horiz.)
APS-C: 76-11.9 ° / 67-10 °

It's rainy day here, I guess I know what my project is.

Here are the D-FOV and H-FOV, for those who who do not hate charts. The 10-17 is cut off since it is an outlier, but it goes way up to 180.

Attached Images
   

Last edited by madison_wi_gal; 06-04-2022 at 07:55 AM. Reason: added graphs
06-04-2022, 07:21 AM   #5
Pentaxian
AfterPentax Mark II's Avatar

Join Date: Mar 2021
Posts: 935
QuoteOriginally posted by madison_wi_gal Quote
Ay! I am a geek but maybe not to this level. OK, I'm game for the angle of view calculation. My lenses are on the Pentax forum site (example 18-135 is (Diag. / Horiz.)
APS-C: 76-11.9 ° / 67-10 °

It s rainy day here, I guess I know what my project is.
Ever thought of using your time at finding out how to make pictures on a rainy day? I hate these kind of charts, I rather take pictures, on a rainy day like one of my cats inside when posing in an attractive way...
06-04-2022, 07:49 AM - 1 Like   #6
Pentaxian




Join Date: Feb 2015
Photos: Gallery | Albums
Posts: 10,657
Lenses can be like hand bags and shoes, lots of overlap is normal
There is a saying: "better have more lenses than no enough".
06-04-2022, 08:27 AM - 2 Likes   #7
Reboot before calling IT
Loyal Site Supporter
madison_wi_gal's Avatar

Join Date: Sep 2016
Location: Madison WI
Photos: Gallery | Albums
Posts: 502
Original Poster
QuoteOriginally posted by biz-engineer Quote
Lenses can be like hand bags and shoes, lots of overlap is normal
There is a saying: "better have more lenses than no enough".
Do *not* get me started on handbags : I have overlap on those as well. Shoes, not so much.

06-04-2022, 09:04 AM - 1 Like   #8
Pentaxian




Join Date: Jan 2018
Location: Jersey C.I.
Photos: Albums
Posts: 2,089
Here's another factor (or two) for your charts … closest focus distance against field of view.
For instance, my Adaptall-2 #52B Tamron 90mm (MFD 1.3ft) has the same (or very similar) field of view (approx. 4cm) as my autofocus #A17 Tamron 70-300mm (MFD 3.1ft) when both are set to their respective minimum distances.
The one may be good for a low-angle shot of a flower or whatever in undergrowth, the other much better for a butterfly on a flower, simply 'cos I'm stood further away and not spooking it
The perspectives will differ, but the relative subject sizes will be similar
06-04-2022, 09:15 AM - 1 Like   #9
Reboot before calling IT
Loyal Site Supporter
madison_wi_gal's Avatar

Join Date: Sep 2016
Location: Madison WI
Photos: Gallery | Albums
Posts: 502
Original Poster
QuoteOriginally posted by kypfer Quote
Here's another factor (or two) for your charts … closest focus distance against field of view.
Trying to figure out how to graph that. Maybe quick and dirty CFD vs median of FOV? I see what you mean though.

I think CFD vs max FOV might work, since that gets me to what is IN THE FRAME.

Last edited by madison_wi_gal; 06-04-2022 at 09:47 AM.
06-04-2022, 09:39 AM - 1 Like   #10
Site Supporter
Site Supporter
AggieDad's Avatar

Join Date: Jan 2015
Location: Houston, TX
Photos: Gallery | Albums
Posts: 1,278
QuoteOriginally posted by AfterPentax Mark II Quote
Ever thought of using your time at finding out how to make pictures on a rainy day? I hate these kind of charts, I rather take pictures, on a rainy day like one of my cats inside when posing in an attractive way...
Pictures of cats!? Aargh. Can a rainy day be that bad?
06-04-2022, 09:55 AM - 1 Like   #11
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 23,084
QuoteOriginally posted by madison_wi_gal Quote
Ay! I am a geek but maybe not to this level. OK, I'm game for the angle of view calculation. My lenses are on the Pentax forum site (example 18-135 is (Diag. / Horiz.)
APS-C: 76-11.9 ° / 67-10 °

It's rainy day here, I guess I know what my project is.

Here are the D-FOV and H-FOV, for those who who do not hate charts. The 10-17 is cut off since it is an outlier, but it goes way up to 180.
What I like about this is that it gives another perspective on how the lenses cover various aspects of photography. The angle of view or focal length can be misleading but by having both you have a good idea of how these lenses overlap. Practically speaking - not terribly important but fun if you like data.
Now - embed an image taken at each focal length from the lenses of the same subject... EVIL LAUGH...
06-04-2022, 10:09 AM   #12
Reboot before calling IT
Loyal Site Supporter
madison_wi_gal's Avatar

Join Date: Sep 2016
Location: Madison WI
Photos: Gallery | Albums
Posts: 502
Original Poster
QuoteOriginally posted by UncleVanya Quote
What I like about this is that it gives another perspective on how the lenses cover various aspects of photography. The angle of view or focal length can be misleading but by having both you have a good idea of how these lenses overlap. Practically speaking - not terribly important but fun if you like data.
Now - embed an image taken at each focal length from the lenses of the same subject... EVIL LAUGH...
I like data but having a terrible time with the next iteration which was CFD vs. FOV. I am farming that one out to an even bigger geek.

I think bottom line is:

I have quite a few lenses, some are ~(medium) high-end and some are kit lenses and run of the mill lenses.
They vary in quality, CFD and FOV.
I do have overlap but there is no "perfect" lens for all uses. That said, my favorite pics are from the 18-135 and the 10-17.
I take pics that make me happy and I do not sell them, so no harm if they do not make anyone else happy.
06-04-2022, 10:54 AM - 1 Like   #13
Loyal Site Supporter
Loyal Site Supporter
UncleVanya's Avatar

Join Date: Jul 2014
Photos: Gallery | Albums
Posts: 23,084
QuoteOriginally posted by madison_wi_gal Quote
I like data but having a terrible time with the next iteration which was CFD vs. FOV. I am farming that one out to an even bigger geek.

I think bottom line is:

I have quite a few lenses, some are ~(medium) high-end and some are kit lenses and run of the mill lenses.
They vary in quality, CFD and FOV.
I do have overlap but there is no "perfect" lens for all uses. That said, my favorite pics are from the 18-135 and the 10-17.
I take pics that make me happy and I do not sell them, so no harm if they do not make anyone else happy.
I own too many lenses myself. I also like those two lenses a lot.
06-04-2022, 12:42 PM - 1 Like   #14
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jul 2021
Location: Zuiderkempen - Grote Netewoud - Belgium
Photos: Gallery
Posts: 278
1. Overlap is actually redundancy.... hence not a problem but risk mitigation.... 😉 or just an opportunity to share with my grown-up kids.

2. Maybe you should go 3D, adding a dimension like aperture for dof manipulation and lowlight conditions, or minimum focus distance for max magnification in macro , or another use case (travel-lightweight, family indoor-wide, kids-fast, wildlife-tele, sports-fast focus, ...). , most likely it will reveal shortcomings in your lens portfolio....and hopefully explain why you did acquire a specific lens.


PS: my most used lens is a sigma 17-70 f2.8 4 hsm, sometimes replaced by a 17-50 f2,8 screwdrive. Most times accompanied by the pentax 10-17 and one tele (many options), oh, and a f1,7 50mm for evenings and night shots. All with a K3II in a small backpack ...allowing also for a few drinks/snacks for sharing to avoid I am questioned why I need a backpack (and soo many lenses).
Only when I travel for work ( but still want a camera with me , just in case ) or when circumstances require caution (like mass events..), I use a secondhand k70 and a compact 18-250 zoom.
06-04-2022, 05:25 PM - 2 Likes   #15
Pentaxian
Driline's Avatar

Join Date: Dec 2012
Location: IOWA Where the Tall Corn Grows
Photos: Gallery
Posts: 3,254
QuoteOriginally posted by madison_wi_gal Quote
Do *not* get me started on handbags : I have overlap on those as well. Shoes, not so much.
Do Billingham Bags count? I have 4 myself
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
angle, da, da*, distances, f/2, f/4, fa, field, flower, k-mount, lba, lba lba lba, lba overlap lens, length, lenses, mfd, mm, overlap, pentax lens, scope, shot, slr lens, space, tamron, user, view
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Limited overlap jerryleejr Pentax SLR Lens Discussion 16 05-02-2021 07:44 AM
PZ-1 Frame Overlap and ZX Mirror Motor Replacement chunkiness Film SLRs and Compact Film Cameras 3 05-04-2017 07:07 AM
Please help… I have “LBA-P”… LBA Paranoia!!!!! pHREDD D Pentax SLR Lens Discussion 14 03-13-2010 07:29 AM
lens overlap question gokenin Pentax SLR Lens Discussion 9 12-27-2007 09:53 PM
Lens overlap/gap? Benny Pentax SLR Lens Discussion 6 05-19-2007 09:59 AM



All times are GMT -7. The time now is 10:11 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top