Log in or Sign up
Coin Talk
Home
Forums
>
Coin Forums
>
Ancient Coins
>
Photography Friday
>
Reply to Thread
Message:
<p>[QUOTE="Kaleun96, post: 7802927, member: 92635"]Excellent photo Denis! Can't recall if I've asked you before, I'm unsure because I've definitely read your posts multiple times when it comes to axial lighting setups, but do you notice a significant decrease in sharpness with axial illumination?</p><p><br /></p><p>I've tried all sorts of different things: continuous lighting (Godox SL-60W), flash (Godox TT350), blocking all external and non-axial sources of light (best to my ability), preventing reflections from the light bouncing back and going up into the lens, thin glass, thick glass, borosilicate glass, optical-grade beamsplitter glass (0.7mm thick), perfect 45 degree glass angle vs slightly off 45 degrees etc but I could never live with the reduction in sharpness.</p><p><br /></p><p>For context, I always focus stack (and thus pixel-peep) so perhaps the loss in sharpness is not so bad with single images at f/11-f/16, but once I know what sharpness I can get it's difficult to justify living with anything less.</p><p><br /></p><p>My best guess is I'm getting ghosting and that is reducing sharpness. I've been able to take photos through the glass at 45 degrees without axial light and the sharpness seems better. Some I've talked to in the macro photography community have had similar experiences with axial illumination over the years and also given up so I'm starting to wonder if decreased sharpness is just the price you pay.</p><p><br /></p><p>I have a comparison of three methods here, not perfect by any means but enough to illustrate my observations above: <a href="https://easyzoom.com/image/243812" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://easyzoom.com/image/243812" rel="nofollow">https://easyzoom.com/image/243812</a></p><p><br /></p><p>Left: Axial illumination with Godox SL-60W continuous LED light</p><p>Middle: Glass pane still in front of lens at 45 degrees but the coin is lit non-axially, i.e. does not reflect or refract off the glass, still using the Godox SL-60W</p><p>Right: Laowa LED ring light "pseudo-axial"</p><p><br /></p><p>I think the middle photo still shows a decrease in sharpness but without the weird sparkling of the light on the surface as in the axial photo (left). It's not focused as perfectly compared to the other two so less of the image is in-focus.[/QUOTE]</p><p><br /></p>
[QUOTE="Kaleun96, post: 7802927, member: 92635"]Excellent photo Denis! Can't recall if I've asked you before, I'm unsure because I've definitely read your posts multiple times when it comes to axial lighting setups, but do you notice a significant decrease in sharpness with axial illumination? I've tried all sorts of different things: continuous lighting (Godox SL-60W), flash (Godox TT350), blocking all external and non-axial sources of light (best to my ability), preventing reflections from the light bouncing back and going up into the lens, thin glass, thick glass, borosilicate glass, optical-grade beamsplitter glass (0.7mm thick), perfect 45 degree glass angle vs slightly off 45 degrees etc but I could never live with the reduction in sharpness. For context, I always focus stack (and thus pixel-peep) so perhaps the loss in sharpness is not so bad with single images at f/11-f/16, but once I know what sharpness I can get it's difficult to justify living with anything less. My best guess is I'm getting ghosting and that is reducing sharpness. I've been able to take photos through the glass at 45 degrees without axial light and the sharpness seems better. Some I've talked to in the macro photography community have had similar experiences with axial illumination over the years and also given up so I'm starting to wonder if decreased sharpness is just the price you pay. I have a comparison of three methods here, not perfect by any means but enough to illustrate my observations above: [URL]https://easyzoom.com/image/243812[/URL] Left: Axial illumination with Godox SL-60W continuous LED light Middle: Glass pane still in front of lens at 45 degrees but the coin is lit non-axially, i.e. does not reflect or refract off the glass, still using the Godox SL-60W Right: Laowa LED ring light "pseudo-axial" I think the middle photo still shows a decrease in sharpness but without the weird sparkling of the light on the surface as in the axial photo (left). It's not focused as perfectly compared to the other two so less of the image is in-focus.[/QUOTE]
Your name or email address:
Do you already have an account?
No, create an account now.
Yes, my password is:
Forgot your password?
Stay logged in
Coin Talk
Home
Forums
>
Coin Forums
>
Ancient Coins
>
Photography Friday
>
Home
Home
Quick Links
Search Forums
Recent Activity
Recent Posts
Forums
Forums
Quick Links
Search Forums
Recent Posts
Competitions
Competitions
Quick Links
Competition Index
Rules, Terms & Conditions
Gallery
Gallery
Quick Links
Search Media
New Media
Showcase
Showcase
Quick Links
Search Items
Most Active Members
New Items
Directory
Directory
Quick Links
Directory Home
New Listings
Members
Members
Quick Links
Notable Members
Current Visitors
Recent Activity
New Profile Posts
Sponsors
Menu
Search
Search titles only
Posted by Member:
Separate names with a comma.
Newer Than:
Search this thread only
Search this forum only
Display results as threads
Useful Searches
Recent Posts
More...