yst Posted February 17 Share #1 Posted February 17 Advertisement (gone after registration) Greetings, For using the Leica 35f1.4 TL lens on the Leica new SL3 camera body, compared using on the Leica CL body, what will be the differences of: 1. angle of view on the SL3 full frame? 2. will the depth of field be different? Shallower on the SL3 full frame? Appreciate for info ... Quote Link to post Share on other sites More sharing options...
Advertisement Posted February 17 Posted February 17 Hi yst, Take a look here Summilux 35/f1.4 ASPH TL lens on SL3 body questions.... I'm sure you'll find what you were looking for!
LD_50 Posted February 17 Share #2 Posted February 17 (edited) Crop factor is around 1.53x for TL lens on the smaller sensor size (either on CL or using less of the sensor on SL3). You get approximately 54mm and approximately f2.8 depth of field if you were to produce equal framing when compared to a L lens on SL3. If you’re shooting a TL lens on CL already, results should look the same with the same lens on SL3 in terms of field of view and depth of field. The SL3 will have slightly more resolution (26mp) and any other differences from the newer sensor. Edited February 17 by LD_50 3 Quote Link to post Share on other sites More sharing options...
yst Posted February 17 Author Share #3 Posted February 17 23 minutes ago, LD_50 said: Crop factor is around 1.53x for TL lens on the smaller sensor size (either on CL or using less of the sensor on SL3). You get approximately 54mm and approximately f2.8 depth of field if you were to produce equal framing when compared to a L lens on SL3. If you’re shooting a TL lens on CL already, results should look the same with the same lens on SL3 in terms of field of view and depth of field. The SL3 will have slightly more resolution (26mp) and any other differences from the newer sensor. Thank you 🙏 when you say "You get approximately 54mm and approximately f2.8 depth of field if you were to produce equal framing when compared to a L lens on SL3." do you mean if this lens to produce an angle of view of a size of an image with a 35mm lens, or a 50mm lens? Why would it lose two stops of DOF from f1.4 to f2.8? Quote Link to post Share on other sites More sharing options...
LD_50 Posted February 17 Share #4 Posted February 17 (edited) Shoot the TL lens on CL. Shoot it on SL3. You get the same FOV and DOF. To get the same FOV and DOF with a FF L lens on SL3, you’d have to shoot at 54mm at f/2.8 (I rounded both values). Search for this and you’ll find countless articles that explain why. You end up standing at different shooting distances for equal framing, changing the DOF. Edited February 17 by LD_50 2 Quote Link to post Share on other sites More sharing options...
yst Posted February 18 Author Share #5 Posted February 18 23 hours ago, LD_50 said: Shoot the TL lens on CL. Shoot it on SL3. You get the same FOV and DOF. To get the same FOV and DOF with a FF L lens on SL3, you’d have to shoot at 54mm at f/2.8 (I rounded both values). Search for this and you’ll find countless articles that explain why. You end up standing at different shooting distances for equal framing, changing the DOF. A "50mm/f1.4 L-lens" on a SL3, vs a "35mm/f1.4 TL-lens" on a SL3, do they have the same DOF? If not, why? Quote Link to post Share on other sites More sharing options...
LD_50 Posted February 18 Share #6 Posted February 18 (edited) 56 minutes ago, yst said: A "50mm/f1.4 L-lens" on a SL3, vs a "35mm/f1.4 TL-lens" on a SL3, do they have the same DOF? If not, why? It would be best to read up on the topic. I already explained the basics. To achieve the same framing with an SL3 and a CL, you either need different focal lengths or different shooting distances. Both will change the DOF. The same applies to the 35mm TL lens on the SL3 because it only uses the portion of the sensor equal to the CL sensor in size. It achieves the same crop factor. Edited February 18 by LD_50 2 Quote Link to post Share on other sites More sharing options...
yst Posted February 18 Author Share #7 Posted February 18 (edited) Advertisement (gone after registration) 36 minutes ago, LD_50 said: It would be best to read up on the topic. I already explained the basics. To achieve the same framing with an SL3 and a CL, you either need different focal lengths or different shooting distances. Both will change the DOF. The same applies to the 35mm TL lens on the SL3 because it only uses the portion of the sensor equal to the CL sensor in size. It achieves the same crop factor. Thank you for your reply 🙏 But, it was not my question. My question did not mentioned about the comparison with CL camera body, but is only about DOF effect on the SL3 body: A 50mm/f1.4 L-lens on a SL3 body, vs a 35mm/f1.4 TL-lens on a SL3 body, should they have the same DOF? Since now both lenses have the same angle of view on the same SL3 body, and both lenses are at f1.4 aperture? Edited February 18 by yst Quote Link to post Share on other sites More sharing options...
LD_50 Posted February 18 Share #8 Posted February 18 20 minutes ago, yst said: Thank you for your reply 🙏 But, it was not my question. My question did not mentioned about the comparison with CL camera body, but is only about DOF effect on the SL3 body: A 50mm/f1.4 L-lens on a SL3 body, vs a 35mm/f1.4 TL-lens on a SL3 body, should they have the same DOF? Since now both lenses have the same angle of view on the same SL3 body, and both lenses are at f1.4 aperture? I answered your question. A TL lens on SL3 is the same as a TL lens on CL in terms of framing and subject distance, so you end up with the same DOF for either. In both cases (35mm f/1.4 TL lens on SL3 or 35mm f/1.4 TL lens on CL) you have the same crop factor (1.53x) so need the same FF lens to match framing and DOF: 53.5 mm f/2.1 2 Quote Link to post Share on other sites More sharing options...
yst Posted February 18 Author Share #9 Posted February 18 1 hour ago, LD_50 said: I answered your question. A TL lens on SL3 is the same as a TL lens on CL in terms of framing and subject distance, so you end up with the same DOF for either. In both cases (35mm f/1.4 TL lens on SL3 or 35mm f/1.4 TL lens on CL) you have the same crop factor (1.53x) so need the same FF lens to match framing and DOF: 53.5 mm f/2.1 Thank you very much for your info and explanation! I see it lost one stop DOF effect ... Quote Link to post Share on other sites More sharing options...
costa43 Posted February 18 Share #10 Posted February 18 Ld_50 has already explained the technical measurements correctly; 53.5mm at around f2.1. If you want to visualise it then Imagine a standard full frame 35mm f1.4 image in your mind. Then digitally crop into that image a little and that’s the look you are getting essentially. So using this logic, to get the same framing as a FF 35mm you would have to step back a bit to counter the crop, leading you to be further away from your subject thus affecting depth of field. 1 Quote Link to post Share on other sites More sharing options...
yst Posted February 18 Author Share #11 Posted February 18 A good thing that the 35F 1.4 TL lens is excellent at wide open, can be used at f1.4, helping to maximize the DOF effect. Quote Link to post Share on other sites More sharing options...
swatch Posted February 19 Share #12 Posted February 19 10 hours ago, yst said: A good thing that the 35F 1.4 TL lens is excellent at wide open, can be used at f1.4, helping to maximize the DOF effect. TL 35mm 1.4 is a good and nice lens. 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted February 19 Share #13 Posted February 19 On 2/18/2025 at 6:24 AM, costa43 said: Ld_50 has already explained the technical measurements correctly; 53.5mm at around f2.1. If you want to visualise it then Imagine a standard full frame 35mm f1.4 image in your mind. Then digitally crop into that image a little and that’s the look you are getting essentially. So using this logic, to get the same framing as a FF 35mm you would have to step back a bit to counter the crop, leading you to be further away from your subject thus affecting depth of field. Maybe important to emphasize that the DOF aperture number does NOT affect lens speed. In terms of exposure it will still be an 1.4 lens. 3 Quote Link to post Share on other sites More sharing options...
costa43 Posted February 19 Share #14 Posted February 19 (edited) 16 minutes ago, jaapv said: Maybe important to emphasize that the DOF aperture number does NOT affect lens speed. In terms of exposure it will still be an 1.4 lens. Yes, in terms of exposure, aperture is always a constant irrespective of the format. An f1.4 lens will always be f1.4 whether you bolt it onto a micro 4/3 sensor, APSC or a full frame. It’s just the ‘look’ that changes. Edited February 19 by costa43 2 Quote Link to post Share on other sites More sharing options...
jaapv Posted February 19 Share #15 Posted February 19 And, given the subjective nature of DOF this change is not always relevant. I find that things like contrast, clarity, haze and subject detail can make much more of a difference to separation. 1 Quote Link to post Share on other sites More sharing options...
yst Posted February 19 Author Share #16 Posted February 19 6 hours ago, jaapv said: Maybe important to emphasize that the DOF aperture number does NOT affect lens speed. In terms of exposure it will still be an 1.4 lens. 👍 Good to know! By the way, do you still have your Leica CL system? What lenses do you find most used for you? Quote Link to post Share on other sites More sharing options...
jaapv Posted February 20 Share #17 Posted February 20 Yes, I have, but it is relegated to backup use. 18-56, 55-135 Summilux-M 24, Super Elmar 18 and Voigtländer 12 mm. The last three transferred to my SL/S5 system and complement my M9M system. 1 Quote Link to post Share on other sites More sharing options...
yst Posted February 20 Author Share #18 Posted February 20 22 hours ago, jaapv said: Yes, I have, but it is relegated to backup use. 18-56, 55-135 Summilux-M 24, Super Elmar 18 and Voigtländer 12 mm. The last three transferred to my SL/S5 system and complement my M9M system. Thank you. How’s your experience with the Summilux-M lens on the CL camera? Quote Link to post Share on other sites More sharing options...
jaapv Posted February 20 Share #19 Posted February 20 It is a never-sell lens. I use it on all my cameras. The combination of separation and wideangle makes it unique. On the CL it is a character 35 lens and, despite slightly deeper DOF it renders like a classic Summilux 35 on full frame. 1 Quote Link to post Share on other sites More sharing options...
yst Posted February 21 Author Share #20 Posted February 21 1 hour ago, jaapv said: It is a never-sell lens. I use it on all my cameras. The combination of separation and wideangle makes it unique. On the CL it is a character 35 lens and, despite slightly deeper DOF it renders like a classic Summilux 35 on full frame. How about the Leica 21mmf1.4 Summilux-M ASPH lens with the CL body (equivalent to 32mm)? Instead of the 24mm Summilux-M? Quote Link to post Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.